Build: https://builds.apache.org/job/Lucene-Solr-NightlyTests-8.x/297/

1 tests failed.
FAILED:  
org.apache.lucene.index.TestDemoParallelLeafReader.testRandomMultipleSchemaGens

Error Message:
/home/jenkins/jenkins-slave/workspace/Lucene-Solr-NightlyTests-8.x/checkout/lucene/build/core/test/J2/temp/lucene.index.TestDemoParallelLeafReader_D1AD2D71F762344B-001/tempDir-002/index/_ms.fdx:
 Too many open files

Stack Trace:
java.nio.file.FileSystemException: 
/home/jenkins/jenkins-slave/workspace/Lucene-Solr-NightlyTests-8.x/checkout/lucene/build/core/test/J2/temp/lucene.index.TestDemoParallelLeafReader_D1AD2D71F762344B-001/tempDir-002/index/_ms.fdx:
 Too many open files
        at 
org.apache.lucene.mockfile.HandleLimitFS.onOpen(HandleLimitFS.java:48)
        at 
org.apache.lucene.mockfile.HandleTrackingFS.callOpenHook(HandleTrackingFS.java:81)
        at 
org.apache.lucene.mockfile.HandleTrackingFS.newFileChannel(HandleTrackingFS.java:197)
        at 
org.apache.lucene.mockfile.FilterFileSystemProvider.newFileChannel(FilterFileSystemProvider.java:202)
        at java.nio.channels.FileChannel.open(FileChannel.java:287)
        at java.nio.channels.FileChannel.open(FileChannel.java:335)
        at 
org.apache.lucene.store.NIOFSDirectory.openInput(NIOFSDirectory.java:81)
        at 
org.apache.lucene.store.NRTCachingDirectory.openInput(NRTCachingDirectory.java:181)
        at 
org.apache.lucene.util.LuceneTestCase.slowFileExists(LuceneTestCase.java:2862)
        at 
org.apache.lucene.store.MockDirectoryWrapper.openInput(MockDirectoryWrapper.java:747)
        at 
org.apache.lucene.store.Directory.openChecksumInput(Directory.java:157)
        at 
org.apache.lucene.store.MockDirectoryWrapper.openChecksumInput(MockDirectoryWrapper.java:1069)
        at 
org.apache.lucene.codecs.compressing.CompressingStoredFieldsReader.<init>(CompressingStoredFieldsReader.java:128)
        at 
org.apache.lucene.codecs.compressing.CompressingStoredFieldsFormat.fieldsReader(CompressingStoredFieldsFormat.java:121)
        at 
org.apache.lucene.codecs.lucene50.Lucene50StoredFieldsFormat.fieldsReader(Lucene50StoredFieldsFormat.java:173)
        at 
org.apache.lucene.codecs.asserting.AssertingStoredFieldsFormat.fieldsReader(AssertingStoredFieldsFormat.java:43)
        at 
org.apache.lucene.index.SegmentCoreReaders.<init>(SegmentCoreReaders.java:127)
        at org.apache.lucene.index.SegmentReader.<init>(SegmentReader.java:84)
        at 
org.apache.lucene.index.ReadersAndUpdates.getReader(ReadersAndUpdates.java:177)
        at 
org.apache.lucene.index.BufferedUpdatesStream$SegmentState.<init>(BufferedUpdatesStream.java:271)
        at 
org.apache.lucene.index.FrozenBufferedUpdates.openSegmentStates(FrozenBufferedUpdates.java:328)
        at 
org.apache.lucene.index.FrozenBufferedUpdates.forceApply(FrozenBufferedUpdates.java:221)
        at 
org.apache.lucene.index.FrozenBufferedUpdates.tryApply(FrozenBufferedUpdates.java:159)
        at 
org.apache.lucene.index.IndexWriter.lambda$publishFrozenUpdates$3(IndexWriter.java:2592)
        at 
org.apache.lucene.index.IndexWriter.processEvents(IndexWriter.java:5116)
        at 
org.apache.lucene.index.IndexWriter.updateDocument(IndexWriter.java:1597)
        at 
org.apache.lucene.index.IndexWriter.addDocument(IndexWriter.java:1213)
        at 
org.apache.lucene.index.TestDemoParallelLeafReader.testRandomMultipleSchemaGens(TestDemoParallelLeafReader.java:980)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)
        at 
com.carrotsearch.randomizedtesting.RandomizedRunner.invoke(RandomizedRunner.java:1750)
        at 
com.carrotsearch.randomizedtesting.RandomizedRunner$8.evaluate(RandomizedRunner.java:938)
        at 
com.carrotsearch.randomizedtesting.RandomizedRunner$9.evaluate(RandomizedRunner.java:974)
        at 
com.carrotsearch.randomizedtesting.RandomizedRunner$10.evaluate(RandomizedRunner.java:988)
        at 
org.apache.lucene.util.TestRuleSetupTeardownChained$1.evaluate(TestRuleSetupTeardownChained.java:49)
        at 
org.apache.lucene.util.AbstractBeforeAfterRule$1.evaluate(AbstractBeforeAfterRule.java:45)
        at 
org.apache.lucene.util.TestRuleThreadAndTestName$1.evaluate(TestRuleThreadAndTestName.java:48)
        at 
org.apache.lucene.util.TestRuleIgnoreAfterMaxFailures$1.evaluate(TestRuleIgnoreAfterMaxFailures.java:64)
        at 
org.apache.lucene.util.TestRuleMarkFailure$1.evaluate(TestRuleMarkFailure.java:47)
        at 
com.carrotsearch.randomizedtesting.rules.StatementAdapter.evaluate(StatementAdapter.java:36)
        at 
com.carrotsearch.randomizedtesting.ThreadLeakControl$StatementRunner.run(ThreadLeakControl.java:368)
        at 
com.carrotsearch.randomizedtesting.ThreadLeakControl.forkTimeoutingTask(ThreadLeakControl.java:817)
        at 
com.carrotsearch.randomizedtesting.ThreadLeakControl$3.evaluate(ThreadLeakControl.java:468)
        at 
com.carrotsearch.randomizedtesting.RandomizedRunner.runSingleTest(RandomizedRunner.java:947)
        at 
com.carrotsearch.randomizedtesting.RandomizedRunner$5.evaluate(RandomizedRunner.java:832)
        at 
com.carrotsearch.randomizedtesting.RandomizedRunner$6.evaluate(RandomizedRunner.java:883)
        at 
com.carrotsearch.randomizedtesting.RandomizedRunner$7.evaluate(RandomizedRunner.java:894)
        at 
org.apache.lucene.util.AbstractBeforeAfterRule$1.evaluate(AbstractBeforeAfterRule.java:45)
        at 
com.carrotsearch.randomizedtesting.rules.StatementAdapter.evaluate(StatementAdapter.java:36)
        at 
org.apache.lucene.util.TestRuleStoreClassName$1.evaluate(TestRuleStoreClassName.java:41)
        at 
com.carrotsearch.randomizedtesting.rules.NoShadowingOrOverridesOnMethodsRule$1.evaluate(NoShadowingOrOverridesOnMethodsRule.java:40)
        at 
com.carrotsearch.randomizedtesting.rules.NoShadowingOrOverridesOnMethodsRule$1.evaluate(NoShadowingOrOverridesOnMethodsRule.java:40)
        at 
com.carrotsearch.randomizedtesting.rules.StatementAdapter.evaluate(StatementAdapter.java:36)
        at 
com.carrotsearch.randomizedtesting.rules.StatementAdapter.evaluate(StatementAdapter.java:36)
        at 
com.carrotsearch.randomizedtesting.rules.StatementAdapter.evaluate(StatementAdapter.java:36)
        at 
org.apache.lucene.util.TestRuleAssertionsRequired$1.evaluate(TestRuleAssertionsRequired.java:53)
        at 
org.apache.lucene.util.TestRuleMarkFailure$1.evaluate(TestRuleMarkFailure.java:47)
        at 
org.apache.lucene.util.TestRuleIgnoreAfterMaxFailures$1.evaluate(TestRuleIgnoreAfterMaxFailures.java:64)
        at 
org.apache.lucene.util.TestRuleIgnoreTestSuites$1.evaluate(TestRuleIgnoreTestSuites.java:54)
        at 
com.carrotsearch.randomizedtesting.rules.StatementAdapter.evaluate(StatementAdapter.java:36)
        at 
com.carrotsearch.randomizedtesting.ThreadLeakControl$StatementRunner.run(ThreadLeakControl.java:368)
        at java.lang.Thread.run(Thread.java:748)




Build Log:
[...truncated 1556 lines...]
   [junit4] Suite: org.apache.lucene.index.TestDemoParallelLeafReader
   [junit4]   2> ??? 16, 2019 1:22:39 ?? 
com.carrotsearch.randomizedtesting.RandomizedRunner$QueueUncaughtExceptionsHandler
 uncaughtException
   [junit4]   2> ??: Uncaught exception in thread: Thread[Lucene Merge Thread 
#56,5,TGRP-TestDemoParallelLeafReader]
   [junit4]   2> org.apache.lucene.index.MergePolicy$MergeException: 
java.lang.IllegalStateException: this writer hit an unrecoverable error; cannot 
complete merge
   [junit4]   2>        at 
__randomizedtesting.SeedInfo.seed([D1AD2D71F762344B]:0)
   [junit4]   2>        at 
org.apache.lucene.index.ConcurrentMergeScheduler.handleMergeException(ConcurrentMergeScheduler.java:704)
   [junit4]   2>        at 
org.apache.lucene.index.ConcurrentMergeScheduler$MergeThread.run(ConcurrentMergeScheduler.java:684)
   [junit4]   2> Caused by: java.lang.IllegalStateException: this writer hit an 
unrecoverable error; cannot complete merge
   [junit4]   2>        at 
org.apache.lucene.index.IndexWriter.commitMerge(IndexWriter.java:3880)
   [junit4]   2>        at 
org.apache.lucene.index.IndexWriter.mergeMiddle(IndexWriter.java:4619)
   [junit4]   2>        at 
org.apache.lucene.index.IndexWriter.merge(IndexWriter.java:4057)
   [junit4]   2>        at 
org.apache.lucene.index.ConcurrentMergeScheduler.doMerge(ConcurrentMergeScheduler.java:625)
   [junit4]   2>        at 
org.apache.lucene.index.ConcurrentMergeScheduler$MergeThread.run(ConcurrentMergeScheduler.java:662)
   [junit4]   2> Caused by: java.nio.file.FileSystemException: 
/home/jenkins/jenkins-slave/workspace/Lucene-Solr-NightlyTests-8.x/checkout/lucene/build/core/test/J2/temp/lucene.index.TestDemoParallelLeafReader_D1AD2D71F762344B-001/tempDir-002/segs/4co6e0ws25r8xxi24lsus808g_121/_g1.fdx:
 Too many open files
   [junit4]   2>        at 
org.apache.lucene.mockfile.HandleLimitFS.onOpen(HandleLimitFS.java:48)
   [junit4]   2>        at 
org.apache.lucene.mockfile.HandleTrackingFS.callOpenHook(HandleTrackingFS.java:81)
   [junit4]   2>        at 
org.apache.lucene.mockfile.HandleTrackingFS.newByteChannel(HandleTrackingFS.java:271)
   [junit4]   2>        at 
org.apache.lucene.mockfile.FilterFileSystemProvider.newByteChannel(FilterFileSystemProvider.java:212)
   [junit4]   2>        at java.nio.file.Files.newByteChannel(Files.java:361)
   [junit4]   2>        at java.nio.file.Files.newByteChannel(Files.java:407)
   [junit4]   2>        at 
org.apache.lucene.store.SimpleFSDirectory.openInput(SimpleFSDirectory.java:77)
   [junit4]   2>        at 
org.apache.lucene.util.LuceneTestCase.slowFileExists(LuceneTestCase.java:2862)
   [junit4]   2>        at 
org.apache.lucene.store.MockDirectoryWrapper.openInput(MockDirectoryWrapper.java:747)
   [junit4]   2>        at 
org.apache.lucene.store.FilterDirectory.openInput(FilterDirectory.java:100)
   [junit4]   2>        at 
org.apache.lucene.store.FilterDirectory.openInput(FilterDirectory.java:100)
   [junit4]   2>        at 
org.apache.lucene.store.FilterDirectory.openInput(FilterDirectory.java:100)
   [junit4]   2>        at 
org.apache.lucene.store.Directory.openChecksumInput(Directory.java:157)
   [junit4]   2>        at 
org.apache.lucene.codecs.lucene50.Lucene50CompoundFormat.write(Lucene50CompoundFormat.java:89)
   [junit4]   2>        at 
org.apache.lucene.index.IndexWriter.createCompoundFile(IndexWriter.java:5014)
   [junit4]   2>        at 
org.apache.lucene.index.DocumentsWriterPerThread.sealFlushedSegment(DocumentsWriterPerThread.java:574)
   [junit4]   2>        at 
org.apache.lucene.index.DocumentsWriterPerThread.flush(DocumentsWriterPerThread.java:513)
   [junit4]   2>        at 
org.apache.lucene.index.DocumentsWriter.doFlush(DocumentsWriter.java:555)
   [junit4]   2>        at 
org.apache.lucene.index.DocumentsWriter.postUpdate(DocumentsWriter.java:414)
   [junit4]   2>        at 
org.apache.lucene.index.DocumentsWriter.updateDocument(DocumentsWriter.java:515)
   [junit4]   2>        at 
org.apache.lucene.index.IndexWriter.updateDocument(IndexWriter.java:1594)
   [junit4]   2>        at 
org.apache.lucene.index.IndexWriter.addDocument(IndexWriter.java:1213)
   [junit4]   2>        at 
org.apache.lucene.index.TestDemoParallelLeafReader$2.reindex(TestDemoParallelLeafReader.java:730)
   [junit4]   2>        at 
org.apache.lucene.index.TestDemoParallelLeafReader$ReindexingReader.getParallelLeafReader(TestDemoParallelLeafReader.java:405)
   [junit4]   2>        at 
org.apache.lucene.index.TestDemoParallelLeafReader$ReindexingReader.getCurrentReader(TestDemoParallelLeafReader.java:163)
   [junit4]   2>        at 
org.apache.lucene.index.TestDemoParallelLeafReader$ReindexingReader$ReindexingMergePolicy$ReindexingOneMerge.wrapForMerge(TestDemoParallelLeafReader.java:533)
   [junit4]   2>        at 
org.apache.lucene.index.IndexWriter.mergeMiddle(IndexWriter.java:4417)
   [junit4]   2>        ... 3 more
   [junit4]   2> 
   [junit4]   2> ??? 16, 2019 1:22:39 ?? 
com.carrotsearch.randomizedtesting.RandomizedRunner$QueueUncaughtExceptionsHandler
 uncaughtException
   [junit4]   2> ??: Uncaught exception in thread: Thread[Lucene Merge Thread 
#54,5,TGRP-TestDemoParallelLeafReader]
   [junit4]   2> org.apache.lucene.index.MergePolicy$MergeException: 
java.nio.file.FileSystemException: 
/home/jenkins/jenkins-slave/workspace/Lucene-Solr-NightlyTests-8.x/checkout/lucene/build/core/test/J2/temp/lucene.index.TestDemoParallelLeafReader_D1AD2D71F762344B-001/tempDir-002/segs/4co6e0ws25r8xxi24lsus808g_121/_g1.fdx:
 Too many open files
   [junit4]   2>        at 
__randomizedtesting.SeedInfo.seed([D1AD2D71F762344B]:0)
   [junit4]   2>        at 
org.apache.lucene.index.ConcurrentMergeScheduler.handleMergeException(ConcurrentMergeScheduler.java:704)
   [junit4]   2>        at 
org.apache.lucene.index.ConcurrentMergeScheduler$MergeThread.run(ConcurrentMergeScheduler.java:684)
   [junit4]   2> Caused by: java.nio.file.FileSystemException: 
/home/jenkins/jenkins-slave/workspace/Lucene-Solr-NightlyTests-8.x/checkout/lucene/build/core/test/J2/temp/lucene.index.TestDemoParallelLeafReader_D1AD2D71F762344B-001/tempDir-002/segs/4co6e0ws25r8xxi24lsus808g_121/_g1.fdx:
 Too many open files
   [junit4]   2>        at 
org.apache.lucene.mockfile.HandleLimitFS.onOpen(HandleLimitFS.java:48)
   [junit4]   2>        at 
org.apache.lucene.mockfile.HandleTrackingFS.callOpenHook(HandleTrackingFS.java:81)
   [junit4]   2>        at 
org.apache.lucene.mockfile.HandleTrackingFS.newByteChannel(HandleTrackingFS.java:271)
   [junit4]   2>        at 
org.apache.lucene.mockfile.FilterFileSystemProvider.newByteChannel(FilterFileSystemProvider.java:212)
   [junit4]   2>        at java.nio.file.Files.newByteChannel(Files.java:361)
   [junit4]   2>        at java.nio.file.Files.newByteChannel(Files.java:407)
   [junit4]   2>        at 
org.apache.lucene.store.SimpleFSDirectory.openInput(SimpleFSDirectory.java:77)
   [junit4]   2>        at 
org.apache.lucene.util.LuceneTestCase.slowFileExists(LuceneTestCase.java:2862)
   [junit4]   2>        at 
org.apache.lucene.store.MockDirectoryWrapper.openInput(MockDirectoryWrapper.java:747)
   [junit4]   2>        at 
org.apache.lucene.store.FilterDirectory.openInput(FilterDirectory.java:100)
   [junit4]   2>        at 
org.apache.lucene.store.FilterDirectory.openInput(FilterDirectory.java:100)
   [junit4]   2>        at 
org.apache.lucene.store.FilterDirectory.openInput(FilterDirectory.java:100)
   [junit4]   2>        at 
org.apache.lucene.store.Directory.openChecksumInput(Directory.java:157)
   [junit4]   2>        at 
org.apache.lucene.codecs.lucene50.Lucene50CompoundFormat.write(Lucene50CompoundFormat.java:89)
   [junit4]   2>        at 
org.apache.lucene.index.IndexWriter.createCompoundFile(IndexWriter.java:5014)
   [junit4]   2>        at 
org.apache.lucene.index.DocumentsWriterPerThread.sealFlushedSegment(DocumentsWriterPerThread.java:574)
   [junit4]   2>        at 
org.apache.lucene.index.DocumentsWriterPerThread.flush(DocumentsWriterPerThread.java:513)
   [junit4]   2>        at 
org.apache.lucene.index.DocumentsWriter.doFlush(DocumentsWriter.java:555)
   [junit4]   2>        at 
org.apache.lucene.index.DocumentsWriter.postUpdate(DocumentsWriter.java:414)
   [junit4]   2>        at 
org.apache.lucene.index.DocumentsWriter.updateDocument(DocumentsWriter.java:515)
   [junit4]   2>        at 
org.apache.lucene.index.IndexWriter.updateDocument(IndexWriter.java:1594)
   [junit4]   2>        at 
org.apache.lucene.index.IndexWriter.addDocument(IndexWriter.java:1213)
   [junit4]   2>        at 
org.apache.lucene.index.TestDemoParallelLeafReader$2.reindex(TestDemoParallelLeafReader.java:730)
   [junit4]   2>        at 
org.apache.lucene.index.TestDemoParallelLeafReader$ReindexingReader.getParallelLeafReader(TestDemoParallelLeafReader.java:405)
   [junit4]   2>        at 
org.apache.lucene.index.TestDemoParallelLeafReader$ReindexingReader.getCurrentReader(TestDemoParallelLeafReader.java:163)
   [junit4]   2>        at 
org.apache.lucene.index.TestDemoParallelLeafReader$ReindexingReader$ReindexingMergePolicy$ReindexingOneMerge.wrapForMerge(TestDemoParallelLeafReader.java:533)
   [junit4]   2>        at 
org.apache.lucene.index.IndexWriter.mergeMiddle(IndexWriter.java:4417)
   [junit4]   2>        at 
org.apache.lucene.index.IndexWriter.merge(IndexWriter.java:4057)
   [junit4]   2>        at 
org.apache.lucene.index.ConcurrentMergeScheduler.doMerge(ConcurrentMergeScheduler.java:625)
   [junit4]   2>        at 
org.apache.lucene.index.ConcurrentMergeScheduler$MergeThread.run(ConcurrentMergeScheduler.java:662)
   [junit4]   2> 
   [junit4]   2> ??? 16, 2019 1:22:39 ?? 
com.carrotsearch.randomizedtesting.RandomizedRunner$QueueUncaughtExceptionsHandler
 uncaughtException
   [junit4]   2> ??: Uncaught exception in thread: Thread[Lucene Merge Thread 
#72,5,TGRP-TestDemoParallelLeafReader]
   [junit4]   2> org.apache.lucene.index.MergePolicy$MergeException: 
java.nio.file.FileSystemException: 
/home/jenkins/jenkins-slave/workspace/Lucene-Solr-NightlyTests-8.x/checkout/lucene/build/core/test/J2/temp/lucene.index.TestDemoParallelLeafReader_D1AD2D71F762344B-001/tempDir-002/segs/4co6e0ws25r8xxi24lsus85d6_122/_1_Lucene80_0.dvm:
 Too many open files
   [junit4]   2>        at 
__randomizedtesting.SeedInfo.seed([D1AD2D71F762344B]:0)
   [junit4]   2>        at 
org.apache.lucene.index.ConcurrentMergeScheduler.handleMergeException(ConcurrentMergeScheduler.java:704)
   [junit4]   2>        at 
org.apache.lucene.index.ConcurrentMergeScheduler$MergeThread.run(ConcurrentMergeScheduler.java:684)
   [junit4]   2> Caused by: java.nio.file.FileSystemException: 
/home/jenkins/jenkins-slave/workspace/Lucene-Solr-NightlyTests-8.x/checkout/lucene/build/core/test/J2/temp/lucene.index.TestDemoParallelLeafReader_D1AD2D71F762344B-001/tempDir-002/segs/4co6e0ws25r8xxi24lsus85d6_122/_1_Lucene80_0.dvm:
 Too many open files
   [junit4]   2>        at 
org.apache.lucene.mockfile.HandleLimitFS.onOpen(HandleLimitFS.java:48)
   [junit4]   2>        at 
org.apache.lucene.mockfile.HandleTrackingFS.callOpenHook(HandleTrackingFS.java:81)
   [junit4]   2>        at 
org.apache.lucene.mockfile.HandleTrackingFS.newOutputStream(HandleTrackingFS.java:160)
   [junit4]   2>        at 
org.apache.lucene.mockfile.FilterFileSystemProvider.newOutputStream(FilterFileSystemProvider.java:197)
   [junit4]   2>        at java.nio.file.Files.newOutputStream(Files.java:216)
   [junit4]   2>        at 
org.apache.lucene.store.FSDirectory$FSIndexOutput.<init>(FSDirectory.java:410)
   [junit4]   2>        at 
org.apache.lucene.store.FSDirectory$FSIndexOutput.<init>(FSDirectory.java:406)
   [junit4]   2>        at 
org.apache.lucene.store.FSDirectory.createOutput(FSDirectory.java:254)
   [junit4]   2>        at 
org.apache.lucene.store.MockDirectoryWrapper.createOutput(MockDirectoryWrapper.java:667)
   [junit4]   2>        at 
org.apache.lucene.store.LockValidatingDirectoryWrapper.createOutput(LockValidatingDirectoryWrapper.java:44)
   [junit4]   2>        at 
org.apache.lucene.store.TrackingDirectoryWrapper.createOutput(TrackingDirectoryWrapper.java:43)
   [junit4]   2>        at 
org.apache.lucene.codecs.lucene80.Lucene80DocValuesConsumer.<init>(Lucene80DocValuesConsumer.java:73)
   [junit4]   2>        at 
org.apache.lucene.codecs.lucene80.Lucene80DocValuesFormat.fieldsConsumer(Lucene80DocValuesFormat.java:141)
   [junit4]   2>        at 
org.apache.lucene.codecs.perfield.PerFieldDocValuesFormat$FieldsWriter.getInstance(PerFieldDocValuesFormat.java:224)
   [junit4]   2>        at 
org.apache.lucene.codecs.perfield.PerFieldDocValuesFormat$FieldsWriter.merge(PerFieldDocValuesFormat.java:139)
   [junit4]   2>        at 
org.apache.lucene.index.SegmentMerger.mergeDocValues(SegmentMerger.java:196)
   [junit4]   2>        at 
org.apache.lucene.index.SegmentMerger.merge(SegmentMerger.java:151)
   [junit4]   2>        at 
org.apache.lucene.index.IndexWriter.mergeMiddle(IndexWriter.java:4463)
   [junit4]   2>        at 
org.apache.lucene.index.IndexWriter.merge(IndexWriter.java:4057)
   [junit4]   2>        at 
org.apache.lucene.index.SerialMergeScheduler.merge(SerialMergeScheduler.java:40)
   [junit4]   2>        at 
org.apache.lucene.index.IndexWriter.maybeMerge(IndexWriter.java:2158)
   [junit4]   2>        at 
org.apache.lucene.index.IndexWriter.forceMerge(IndexWriter.java:1991)
   [junit4]   2>        at 
org.apache.lucene.index.IndexWriter.forceMerge(IndexWriter.java:1940)
   [junit4]   2>        at 
org.apache.lucene.index.TestDemoParallelLeafReader$2.reindex(TestDemoParallelLeafReader.java:746)
   [junit4]   2>        at 
org.apache.lucene.index.TestDemoParallelLeafReader$ReindexingReader.getParallelLeafReader(TestDemoParallelLeafReader.java:405)
   [junit4]   2>        at 
org.apache.lucene.index.TestDemoParallelLeafReader$ReindexingReader.getCurrentReader(TestDemoParallelLeafReader.java:163)
   [junit4]   2>        at 
org.apache.lucene.index.TestDemoParallelLeafReader$ReindexingReader$ReindexingMergePolicy$ReindexingOneMerge.wrapForMerge(TestDemoParallelLeafReader.java:533)
   [junit4]   2>        at 
org.apache.lucene.index.IndexWriter.mergeMiddle(IndexWriter.java:4417)
   [junit4]   2>        at 
org.apache.lucene.index.IndexWriter.merge(IndexWriter.java:4057)
   [junit4]   2>        at 
org.apache.lucene.index.ConcurrentMergeScheduler.doMerge(ConcurrentMergeScheduler.java:625)
   [junit4]   2>        at 
org.apache.lucene.index.ConcurrentMergeScheduler$MergeThread.run(ConcurrentMergeScheduler.java:662)
   [junit4]   2> 
   [junit4]   2> ??? 16, 2019 1:22:39 ?? 
com.carrotsearch.randomizedtesting.RandomizedRunner$QueueUncaughtExceptionsHandler
 uncaughtException
   [junit4]   2> ??: Uncaught exception in thread: Thread[Lucene Merge Thread 
#70,5,TGRP-TestDemoParallelLeafReader]
   [junit4]   2> org.apache.lucene.index.MergePolicy$MergeException: 
java.nio.file.FileSystemException: 
/home/jenkins/jenkins-slave/workspace/Lucene-Solr-NightlyTests-8.x/checkout/lucene/build/core/test/J2/temp/lucene.index.TestDemoParallelLeafReader_D1AD2D71F762344B-001/tempDir-002/segs/4co6e0ws25r8xxi24lsus859k_122/_0_Direct_0.dvdd:
 Too many open files
   [junit4]   2>        at 
__randomizedtesting.SeedInfo.seed([D1AD2D71F762344B]:0)
   [junit4]   2>        at 
org.apache.lucene.index.ConcurrentMergeScheduler.handleMergeException(ConcurrentMergeScheduler.java:704)
   [junit4]   2>        at 
org.apache.lucene.index.ConcurrentMergeScheduler$MergeThread.run(ConcurrentMergeScheduler.java:684)
   [junit4]   2> Caused by: java.nio.file.FileSystemException: 
/home/jenkins/jenkins-slave/workspace/Lucene-Solr-NightlyTests-8.x/checkout/lucene/build/core/test/J2/temp/lucene.index.TestDemoParallelLeafReader_D1AD2D71F762344B-001/tempDir-002/segs/4co6e0ws25r8xxi24lsus859k_122/_0_Direct_0.dvdd:
 Too many open files
   [junit4]   2>        at 
org.apache.lucene.mockfile.HandleLimitFS.onOpen(HandleLimitFS.java:48)
   [junit4]   2>        at 
org.apache.lucene.mockfile.HandleTrackingFS.callOpenHook(HandleTrackingFS.java:81)
   [junit4]   2>        at 
org.apache.lucene.mockfile.HandleTrackingFS.newOutputStream(HandleTrackingFS.java:160)
   [junit4]   2>        at 
org.apache.lucene.mockfile.FilterFileSystemProvider.newOutputStream(FilterFileSystemProvider.java:197)
   [junit4]   2>        at java.nio.file.Files.newOutputStream(Files.java:216)
   [junit4]   2>        at 
org.apache.lucene.store.FSDirectory$FSIndexOutput.<init>(FSDirectory.java:410)
   [junit4]   2>        at 
org.apache.lucene.store.FSDirectory$FSIndexOutput.<init>(FSDirectory.java:406)
   [junit4]   2>        at 
org.apache.lucene.store.FSDirectory.createOutput(FSDirectory.java:254)
   [junit4]   2>        at 
org.apache.lucene.store.MockDirectoryWrapper.createOutput(MockDirectoryWrapper.java:667)
   [junit4]   2>        at 
org.apache.lucene.store.LockValidatingDirectoryWrapper.createOutput(LockValidatingDirectoryWrapper.java:44)
   [junit4]   2>        at 
org.apache.lucene.store.TrackingDirectoryWrapper.createOutput(TrackingDirectoryWrapper.java:43)
   [junit4]   2>        at 
org.apache.lucene.codecs.memory.DirectDocValuesConsumer.<init>(DirectDocValuesConsumer.java:55)
   [junit4]   2>        at 
org.apache.lucene.codecs.memory.DirectDocValuesFormat.fieldsConsumer(DirectDocValuesFormat.java:71)
   [junit4]   2>        at 
org.apache.lucene.codecs.perfield.PerFieldDocValuesFormat$FieldsWriter.getInstance(PerFieldDocValuesFormat.java:224)
   [junit4]   2>        at 
org.apache.lucene.codecs.perfield.PerFieldDocValuesFormat$FieldsWriter.getInstance(PerFieldDocValuesFormat.java:160)
   [junit4]   2>        at 
org.apache.lucene.codecs.perfield.PerFieldDocValuesFormat$FieldsWriter.addNumericField(PerFieldDocValuesFormat.java:109)
   [junit4]   2>        at 
org.apache.lucene.index.NumericDocValuesWriter.flush(NumericDocValuesWriter.java:122)
   [junit4]   2>        at 
org.apache.lucene.index.DefaultIndexingChain.writeDocValues(DefaultIndexingChain.java:263)
   [junit4]   2>        at 
org.apache.lucene.index.DefaultIndexingChain.flush(DefaultIndexingChain.java:138)
   [junit4]   2>        at 
org.apache.lucene.index.DocumentsWriterPerThread.flush(DocumentsWriterPerThread.java:468)
   [junit4]   2>        at 
org.apache.lucene.index.DocumentsWriter.doFlush(DocumentsWriter.java:555)
   [junit4]   2>        at 
org.apache.lucene.index.DocumentsWriter.flushAllThreads(DocumentsWriter.java:722)
   [junit4]   2>        at 
org.apache.lucene.index.IndexWriter.doFlush(IndexWriter.java:3591)
   [junit4]   2>        at 
org.apache.lucene.index.IndexWriter.flush(IndexWriter.java:3566)
   [junit4]   2>        at 
org.apache.lucene.index.IndexWriter.forceMerge(IndexWriter.java:1960)
   [junit4]   2>        at 
org.apache.lucene.index.IndexWriter.forceMerge(IndexWriter.java:1940)
   [junit4]   2>        at 
org.apache.lucene.index.TestDemoParallelLeafReader$2.reindex(TestDemoParallelLeafReader.java:746)
   [junit4]   2>        at 
org.apache.lucene.index.TestDemoParallelLeafReader$ReindexingReader.getParallelLeafReader(TestDemoParallelLeafReader.java:405)
   [junit4]   2>        at 
org.apache.lucene.index.TestDemoParallelLeafReader$ReindexingReader.getCurrentReader(TestDemoParallelLeafReader.java:163)
   [junit4]   2>        at 
org.apache.lucene.index.TestDemoParallelLeafReader$ReindexingReader$ReindexingMergePolicy$ReindexingOneMerge.wrapForMerge(TestDemoParallelLeafReader.java:533)
   [junit4]   2>        at 
org.apache.lucene.index.IndexWriter.mergeMiddle(IndexWriter.java:4417)
   [junit4]   2>        at 
org.apache.lucene.index.IndexWriter.merge(IndexWriter.java:4057)
   [junit4]   2>        at 
org.apache.lucene.index.ConcurrentMergeScheduler.doMerge(ConcurrentMergeScheduler.java:625)
   [junit4]   2>        at 
org.apache.lucene.index.ConcurrentMergeScheduler$MergeThread.run(ConcurrentMergeScheduler.java:662)
   [junit4]   2> 
   [junit4]   2> ??? 16, 2019 1:22:39 ?? 
com.carrotsearch.randomizedtesting.RandomizedRunner$QueueUncaughtExceptionsHandler
 uncaughtException
   [junit4]   2> ??: Uncaught exception in thread: Thread[Lucene Merge Thread 
#69,5,TGRP-TestDemoParallelLeafReader]
   [junit4]   2> org.apache.lucene.index.MergePolicy$MergeException: 
java.nio.file.FileSystemException: 
/home/jenkins/jenkins-slave/workspace/Lucene-Solr-NightlyTests-8.x/checkout/lucene/build/core/test/J2/temp/lucene.index.TestDemoParallelLeafReader_D1AD2D71F762344B-001/tempDir-002/segs/4co6e0ws25r8xxi24lsus8585_122/_0_Direct_0.dvdm:
 Too many open files
   [junit4]   2>        at 
__randomizedtesting.SeedInfo.seed([D1AD2D71F762344B]:0)
   [junit4]   2>        at 
org.apache.lucene.index.ConcurrentMergeScheduler.handleMergeException(ConcurrentMergeScheduler.java:704)
   [junit4]   2>        at 
org.apache.lucene.index.ConcurrentMergeScheduler$MergeThread.run(ConcurrentMergeScheduler.java:684)
   [junit4]   2> Caused by: java.nio.file.FileSystemException: 
/home/jenkins/jenkins-slave/workspace/Lucene-Solr-NightlyTests-8.x/checkout/lucene/build/core/test/J2/temp/lucene.index.TestDemoParallelLeafReader_D1AD2D71F762344B-001/tempDir-002/segs/4co6e0ws25r8xxi24lsus8585_122/_0_Direct_0.dvdm:
 Too many open files
   [junit4]   2>        at 
org.apache.lucene.mockfile.HandleLimitFS.onOpen(HandleLimitFS.java:48)
   [junit4]   2>        at 
org.apache.lucene.mockfile.HandleTrackingFS.callOpenHook(HandleTrackingFS.java:81)
   [junit4]   2>        at 
org.apache.lucene.mockfile.HandleTrackingFS.newOutputStream(HandleTrackingFS.java:160)
   [junit4]   2>        at 
org.apache.lucene.mockfile.FilterFileSystemProvider.newOutputStream(FilterFileSystemProvider.java:197)
   [junit4]   2>        at java.nio.file.Files.newOutputStream(Files.java:216)
   [junit4]   2>        at 
org.apache.lucene.store.FSDirectory$FSIndexOutput.<init>(FSDirectory.java:410)
   [junit4]   2>        at 
org.apache.lucene.store.FSDirectory$FSIndexOutput.<init>(FSDirectory.java:406)
   [junit4]   2>        at 
org.apache.lucene.store.FSDirectory.createOutput(FSDirectory.java:254)
   [junit4]   2>        at 
org.apache.lucene.store.MockDirectoryWrapper.createOutput(MockDirectoryWrapper.java:667)
   [junit4]   2>        at 
org.apache.lucene.store.LockValidatingDirectoryWrapper.createOutput(LockValidatingDirectoryWrapper.java:44)
   [junit4]   2>        at 
org.apache.lucene.store.TrackingDirectoryWrapper.createOutput(TrackingDirectoryWrapper.java:43)
   [junit4]   2>        at 
org.apache.lucene.codecs.memory.DirectDocValuesConsumer.<init>(DirectDocValuesConsumer.java:58)
   [junit4]   2>        at 
org.apache.lucene.codecs.memory.DirectDocValuesFormat.fieldsConsumer(DirectDocValuesFormat.java:71)
   [junit4]   2>        at 
org.apache.lucene.codecs.perfield.PerFieldDocValuesFormat$FieldsWriter.getInstance(PerFieldDocValuesFormat.java:224)
   [junit4]   2>        at 
org.apache.lucene.codecs.perfield.PerFieldDocValuesFormat$FieldsWriter.getInstance(PerFieldDocValuesFormat.java:160)
   [junit4]   2>        at 
org.apache.lucene.codecs.perfield.PerFieldDocValuesFormat$FieldsWriter.addNumericField(PerFieldDocValuesFormat.java:109)
   [junit4]   2>        at 
org.apache.lucene.index.NumericDocValuesWriter.flush(NumericDocValuesWriter.java:122)
   [junit4]   2>        at 
org.apache.lucene.index.DefaultIndexingChain.writeDocValues(DefaultIndexingChain.java:263)
   [junit4]   2>        at 
org.apache.lucene.index.DefaultIndexingChain.flush(DefaultIndexingChain.java:138)
   [junit4]   2>        at 
org.apache.lucene.index.DocumentsWriterPerThread.flush(DocumentsWriterPerThread.java:468)
   [junit4]   2>        at 
org.apache.lucene.index.DocumentsWriter.doFlush(DocumentsWriter.java:555)
   [junit4]   2>        at 
org.apache.lucene.index.DocumentsWriter.flushAllThreads(DocumentsWriter.java:722)
   [junit4]   2>        at 
org.apache.lucene.index.IndexWriter.doFlush(IndexWriter.java:3591)
   [junit4]   2>        at 
org.apache.lucene.index.IndexWriter.flush(IndexWriter.java:3566)
   [junit4]   2>        at 
org.apache.lucene.index.IndexWriter.forceMerge(IndexWriter.java:1960)
   [junit4]   2>        at 
org.apache.lucene.index.IndexWriter.forceMerge(IndexWriter.java:1940)
   [junit4]   2>        at 
org.apache.lucene.index.TestDemoParallelLeafReader$2.reindex(TestDemoParallelLeafReader.java:746)
   [junit4]   2>        at 
org.apache.lucene.index.TestDemoParallelLeafReader$ReindexingReader.getParallelLeafReader(TestDemoParallelLeafReader.java:405)
   [junit4]   2>        at 
org.apache.lucene.index.TestDemoParallelLeafReader$ReindexingReader.getCurrentReader(TestDemoParallelLeafReader.java:163)
   [junit4]   2>        at 
org.apache.lucene.index.TestDemoParallelLeafReader$ReindexingReader$ReindexingMergePolicy$ReindexingOneMerge.wrapForMerge(TestDemoParallelLeafReader.java:533)
   [junit4]   2>        at 
org.apache.lucene.index.IndexWriter.mergeMiddle(IndexWriter.java:4417)
   [junit4]   2>        at 
org.apache.lucene.index.IndexWriter.merge(IndexWriter.java:4057)
   [junit4]   2>        at 
org.apache.lucene.index.ConcurrentMergeScheduler.doMerge(ConcurrentMergeScheduler.java:625)
   [junit4]   2>        at 
org.apache.lucene.index.ConcurrentMergeScheduler$MergeThread.run(ConcurrentMergeScheduler.java:662)
   [junit4]   2> 
   [junit4]   2> ??? 16, 2019 1:22:39 ?? 
com.carrotsearch.randomizedtesting.RandomizedRunner$QueueUncaughtExceptionsHandler
 uncaughtException
   [junit4]   2> ??: Uncaught exception in thread: Thread[Lucene Merge Thread 
#68,5,TGRP-TestDemoParallelLeafReader]
   [junit4]   2> org.apache.lucene.index.MergePolicy$MergeException: 
java.nio.file.FileSystemException: 
/home/jenkins/jenkins-slave/workspace/Lucene-Solr-NightlyTests-8.x/checkout/lucene/build/core/test/J2/temp/lucene.index.TestDemoParallelLeafReader_D1AD2D71F762344B-001/tempDir-002/segs/4co6e0ws25r8xxi24lsus8565_122/_1_Lucene80_0.dvm:
 Too many open files
   [junit4]   2>        at 
__randomizedtesting.SeedInfo.seed([D1AD2D71F762344B]:0)
   [junit4]   2>        at 
org.apache.lucene.index.ConcurrentMergeScheduler.handleMergeException(ConcurrentMergeScheduler.java:704)
   [junit4]   2>        at 
org.apache.lucene.index.ConcurrentMergeScheduler$MergeThread.run(ConcurrentMergeScheduler.java:684)
   [junit4]   2> Caused by: java.nio.file.FileSystemException: 
/home/jenkins/jenkins-slave/workspace/Lucene-Solr-NightlyTests-8.x/checkout/lucene/build/core/test/J2/temp/lucene.index.TestDemoParallelLeafReader_D1AD2D71F762344B-001/tempDir-002/segs/4co6e0ws25r8xxi24lsus8565_122/_1_Lucene80_0.dvm:
 Too many open files
   [junit4]   2>        at 
org.apache.lucene.mockfile.HandleLimitFS.onOpen(HandleLimitFS.java:48)
   [junit4]   2>        at 
org.apache.lucene.mockfile.HandleTrackingFS.callOpenHook(HandleTrackingFS.java:81)
   [junit4]   2>        at 
org.apache.lucene.mockfile.HandleTrackingFS.newOutputStream(HandleTrackingFS.java:160)
   [junit4]   2>        at 
org.apache.lucene.mockfile.FilterFileSystemProvider.newOutputStream(FilterFileSystemProvider.java:197)
   [junit4]   2>        at java.nio.file.Files.newOutputStream(Files.java:216)
   [junit4]   2>        at 
org.apache.lucene.store.FSDirectory$FSIndexOutput.<init>(FSDirectory.java:410)
   [junit4]   2>        at 
org.apache.lucene.store.FSDirectory$FSIndexOutput.<init>(FSDirectory.java:406)
   [junit4]   2>        at 
org.apache.lucene.store.FSDirectory.createOutput(FSDirectory.java:254)
   [junit4]   2>        at 
org.apache.lucene.store.MockDirectoryWrapper.createOutput(MockDirectoryWrapper.java:667)
   [junit4]   2>        at 
org.apache.lucene.store.LockValidatingDirectoryWrapper.createOutput(LockValidatingDirectoryWrapper.java:44)
   [junit4]   2>        at 
org.apache.lucene.store.TrackingDirectoryWrapper.createOutput(TrackingDirectoryWrapper.java:43)
   [junit4]   2>        at 
org.apache.lucene.codecs.lucene80.Lucene80DocValuesConsumer.<init>(Lucene80DocValuesConsumer.java:73)
   [junit4]   2>        at 
org.apache.lucene.codecs.lucene80.Lucene80DocValuesFormat.fieldsConsumer(Lucene80DocValuesFormat.java:141)
   [junit4]   2>        at 
org.apache.lucene.codecs.perfield.PerFieldDocValuesFormat$FieldsWriter.getInstance(PerFieldDocValuesFormat.java:224)
   [junit4]   2>        at 
org.apache.lucene.codecs.perfield.PerFieldDocValuesFormat$FieldsWriter.merge(PerFieldDocValuesFormat.java:139)
   [junit4]   2>        at 
org.apache.lucene.index.SegmentMerger.mergeDocValues(SegmentMerger.java:196)
   [junit4]   2>        at 
org.apache.lucene.index.SegmentMerger.merge(SegmentMerger.java:151)
   [junit4]   2>        at 
org.apache.lucene.index.IndexWriter.mergeMiddle(IndexWriter.java:4463)
   [junit4]   2>        at 
org.apache.lucene.index.IndexWriter.merge(IndexWriter.java:4057)
   [junit4]   2>        at 
org.apache.lucene.index.SerialMergeScheduler.merge(SerialMergeScheduler.java:40)
   [junit4]   2>        at 
org.apache.lucene.index.IndexWriter.maybeMerge(IndexWriter.java:2158)
   [junit4]   2>        at 
org.apache.lucene.index.IndexWriter.forceMerge(IndexWriter.java:1991)
   [junit4]   2>        at 
org.apache.lucene.index.IndexWriter.forceMerge(IndexWriter.java:1940)
   [junit4]   2>        at 
org.apache.lucene.index.TestDemoParallelLeafReader$2.reindex(TestDemoParallelLeafReader.java:746)
   [junit4]   2>        at 
org.apache.lucene.index.TestDemoParallelLeafReader$ReindexingReader.getParallelLeafReader(TestDemoParallelLeafReader.java:405)
   [junit4]   2>        at 
org.apache.lucene.index.TestDemoParallelLeafReader$ReindexingReader.getCurrentReader(TestDemoParallelLeafReader.java:163)
   [junit4]   2>        at 
org.apache.lucene.index.TestDemoParallelLeafReader$ReindexingReader$ReindexingMergePolicy$ReindexingOneMerge.wrapForMerge(TestDemoParallelLeafReader.java:533)
   [junit4]   2>        at 
org.apache.lucene.index.IndexWriter.mergeMiddle(IndexWriter.java:4417)
   [junit4]   2>        at 
org.apache.lucene.index.IndexWriter.merge(IndexWriter.java:4057)
   [junit4]   2>        at 
org.apache.lucene.index.ConcurrentMergeScheduler.doMerge(ConcurrentMergeScheduler.java:625)
   [junit4]   2>        at 
org.apache.lucene.index.ConcurrentMergeScheduler$MergeThread.run(ConcurrentMergeScheduler.java:662)
   [junit4]   2> 
   [junit4]   2> ??? 16, 2019 1:22:39 ?? 
com.carrotsearch.randomizedtesting.RandomizedRunner$QueueUncaughtExceptionsHandler
 uncaughtException
   [junit4]   2> ??: Uncaught exception in thread: Thread[Lucene Merge Thread 
#66,5,TGRP-TestDemoParallelLeafReader]
   [junit4]   2> org.apache.lucene.index.MergePolicy$MergeException: 
java.nio.file.FileSystemException: 
/home/jenkins/jenkins-slave/workspace/Lucene-Solr-NightlyTests-8.x/checkout/lucene/build/core/test/J2/temp/lucene.index.TestDemoParallelLeafReader_D1AD2D71F762344B-001/tempDir-002/segs/4co6e0ws25r8xxi24lsus853r_122/_0_Direct_0.dvdd:
 Too many open files
   [junit4]   2>        at 
__randomizedtesting.SeedInfo.seed([D1AD2D71F762344B]:0)
   [junit4]   2>        at 
org.apache.lucene.index.ConcurrentMergeScheduler.handleMergeException(ConcurrentMergeScheduler.java:704)
   [junit4]   2>        at 
org.apache.lucene.index.ConcurrentMergeScheduler$MergeThread.run(ConcurrentMergeScheduler.java:684)
   [junit4]   2> Caused by: java.nio.file.FileSystemException: 
/home/jenkins/jenkins-slave/workspace/Lucene-Solr-NightlyTests-8.x/checkout/lucene/build/core/test/J2/temp/lucene.index.TestDemoParallelLeafReader_D1AD2D71F762344B-001/tempDir-002/segs/4co6e0ws25r8xxi24lsus853r_122/_0_Direct_0.dvdd:
 Too many open files
   [junit4]   2>        at 
org.apache.lucene.mockfile.HandleLimitFS.onOpen(HandleLimitFS.java:48)
   [junit4]   2>        at 
org.apache.lucene.mockfile.HandleTrackingFS.callOpenHook(HandleTrackingFS.java:81)
   [junit4]   2>        at 
org.apache.lucene.mockfile.HandleTrackingFS.newOutputStream(HandleTrackingFS.java:160)
   [junit4]   2>        at 
org.apache.lucene.mockfile.FilterFileSystemProvider.newOutputStream(FilterFileSystemProvider.java:197)
   [junit4]   2>        at java.nio.file.Files.newOutputStream(Files.java:216)
   [junit4]   2>        at 
org.apache.lucene.store.FSDirectory$FSIndexOutput.<init>(FSDirectory.java:410)
   [junit4]   2>        at 
org.apache.lucene.store.FSDirectory$FSIndexOutput.<init>(FSDirectory.java:406)
   [junit4]   2>        at 
org.apache.lucene.store.FSDirectory.createOutput(FSDirectory.java:254)
   [junit4]   2>        at 
org.apache.lucene.store.MockDirectoryWrapper.createOutput(MockDirectoryWrapper.java:667)
   [junit4]   2>        at 
org.apache.lucene.store.LockValidatingDirectoryWrapper.createOutput(LockValidatingDirectoryWrapper.java:44)
   [junit4]   2>        at 
org.apache.lucene.store.TrackingDirectoryWrapper.createOutput(TrackingDirectoryWrapper.java:43)
   [junit4]   2>        at 
org.apache.lucene.codecs.memory.DirectDocValuesConsumer.<init>(DirectDocValuesConsumer.java:55)
   [junit4]   2>        at 
org.apache.lucene.codecs.memory.DirectDocValuesFormat.fieldsConsumer(DirectDocValuesFormat.java:71)
   [junit4]   2>        at 
org.apache.lucene.codecs.perfield.PerFieldDocValuesFormat$FieldsWriter.getInstance(PerFieldDocValuesFormat.java:224)
   [junit4]   2>        at 
org.apache.lucene.codecs.perfield.PerFieldDocValuesFormat$FieldsWriter.getInstance(PerFieldDocValuesFormat.java:160)
   [junit4]   2>        at 
org.apache.lucene.codecs.perfield.PerFieldDocValuesFormat$FieldsWriter.addNumericField(PerFieldDocValuesFormat.java:109)
   [junit4]   2>        at 
org.apache.lucene.index.NumericDocValuesWriter.flush(NumericDocValuesWriter.java:122)
   [junit4]   2>        at 
org.apache.lucene.index.DefaultIndexingChain.writeDocValues(DefaultIndexingChain.java:263)
   [junit4]   2>        at 
org.apache.lucene.index.DefaultIndexingChain.flush(DefaultIndexingChain.java:138)
   [junit4]   2>        at 
org.apache.lucene.index.DocumentsWriterPerThread.flush(DocumentsWriterPerThread.java:468)
   [junit4]   2>        at 
org.apache.lucene.index.DocumentsWriter.doFlush(DocumentsWriter.java:555)
   [junit4]   2>        at 
org.apache.lucene.index.DocumentsWriter.flushAllThreads(DocumentsWriter.java:722)
   [junit4]   2>        at 
org.apache.lucene.index.IndexWriter.doFlush(IndexWriter.java:3591)
   [junit4]   2>        at 
org.apache.lucene.index.IndexWriter.flush(IndexWriter.java:3566)
   [junit4]   2>        at 
org.apache.lucene.index.IndexWriter.forceMerge(IndexWriter.java:1960)
   [junit4]   2>        at 
org.apache.lucene.index.IndexWriter.forceMerge(IndexWriter.java:1940)
   [junit4]   2>        at 
org.apache.lucene.index.TestDemoParallelLeafReader$2.reindex(TestDemoParallelLeafReader.java:746)
   [junit4]   2>        at 
org.apache.lucene.index.TestDemoParallelLeafReader$ReindexingReader.getParallelLeafReader(TestDemoParallelLeafReader.java:405)
   [junit4]   2>        at 
org.apache.lucene.index.TestDemoParallelLeafReader$ReindexingReader.getCurrentReader(TestDemoParallelLeafReader.java:163)
   [junit4]   2>        at 
org.apache.lucene.index.TestDemoParallelLeafReader$ReindexingReader$ReindexingMergePolicy$ReindexingOneMerge.wrapForMerge(TestDemoParallelLeafReader.java:533)
   [junit4]   2>        at 
org.apache.lucene.index.IndexWriter.mergeMiddle(IndexWriter.java:4417)
   [junit4]   2>        at 
org.apache.lucene.index.IndexWriter.merge(IndexWriter.java:4057)
   [junit4]   2>        at 
org.apache.lucene.index.ConcurrentMergeScheduler.doMerge(ConcurrentMergeScheduler.java:625)
   [junit4]   2>        at 
org.apache.lucene.index.ConcurrentMergeScheduler$MergeThread.run(ConcurrentMergeScheduler.java:662)
   [junit4]   2> 
   [junit4]   2> ??? 16, 2019 1:22:39 ?? 
com.carrotsearch.randomizedtesting.RandomizedRunner$QueueUncaughtExceptionsHandler
 uncaughtException
   [junit4]   2> ??: Uncaught exception in thread: Thread[Lucene Merge Thread 
#64,5,TGRP-TestDemoParallelLeafReader]
   [junit4]   2> org.apache.lucene.index.MergePolicy$MergeException: 
java.nio.file.FileSystemException: 
/home/jenkins/jenkins-slave/workspace/Lucene-Solr-NightlyTests-8.x/checkout/lucene/build/core/test/J2/temp/lucene.index.TestDemoParallelLeafReader_D1AD2D71F762344B-001/tempDir-002/segs/4co6e0ws25r8xxi24lsus8517_122/_1_Lucene80_0.dvm:
 Too many open files
   [junit4]   2>        at 
__randomizedtesting.SeedInfo.seed([D1AD2D71F762344B]:0)
   [junit4]   2>        at 
org.apache.lucene.index.ConcurrentMergeScheduler.handleMergeException(ConcurrentMergeScheduler.java:704)
   [junit4]   2>        at 
org.apache.lucene.index.ConcurrentMergeScheduler$MergeThread.run(ConcurrentMergeScheduler.java:684)
   [junit4]   2> Caused by: java.nio.file.FileSystemException: 
/home/jenkins/jenkins-slave/workspace/Lucene-Solr-NightlyTests-8.x/checkout/lucene/build/core/test/J2/temp/lucene.index.TestDemoParallelLeafReader_D1AD2D71F762344B-001/tempDir-002/segs/4co6e0ws25r8xxi24lsus8517_122/_1_Lucene80_0.dvm:
 Too many open files
   [junit4]   2>        at 
org.apache.lucene.mockfile.HandleLimitFS.onOpen(HandleLimitFS.java:48)
   [junit4]   2>        at 
org.apache.lucene.mockfile.HandleTrackingFS.callOpenHook(HandleTrackingFS.java:81)
   [junit4]   2>        at 
org.apache.lucene.mockfile.HandleTrackingFS.newOutputStream(HandleTrackingFS.java:160)
   [junit4]   2>        at 
org.apache.lucene.mockfile.FilterFileSystemProvider.newOutputStream(FilterFileSystemProvider.java:197)
   [junit4]   2>        at java.nio.file.Files.newOutputStream(Files.java:216)
   [junit4]   2>        at 
org.apache.lucene.store.FSDirectory$FSIndexOutput.<init>(FSDirectory.java:410)
   [junit4]   2>        at 
org.apache.lucene.store.FSDirectory$FSIndexOutput.<init>(FSDirectory.java:406)
   [junit4]   2>        at 
org.apache.lucene.store.FSDirectory.createOutput(FSDirectory.java:254)
   [junit4]   2>        at 
org.apache.lucene.store.MockDirectoryWrapper.createOutput(MockDirectoryWrapper.java:667)
   [junit4]   2>        at 
org.apache.lucene.store.LockValidatingDirectoryWrapper.createOutput(LockValidatingDirectoryWrapper.java:44)
   [junit4]   2>        at 
org.apache.lucene.store.TrackingDirectoryWrapper.createOutput(TrackingDirectoryWrapper.java:43)
   [junit4]   2>        at 
org.apache.lucene.codecs.lucene80.Lucene80DocValuesConsumer.<init>(Lucene80DocValuesConsumer.java:73)
   [junit4]   2>        at 
org.apache.lucene.codecs.lucene80.Lucene80DocValuesFormat.fieldsConsumer(Lucene80DocValuesFormat.java:141)
   [junit4]   2>        at 
org.apache.lucene.codecs.perfield.PerFieldDocValuesFormat$FieldsWriter.getInstance(PerFieldDocValuesFormat.java:224)
   [junit4]   2>        at 
org.apache.lucene.codecs.perfield.PerFieldDocValuesFormat$FieldsWriter.merge(PerFieldDocValuesFormat.java:139)
   [junit4]   2>        at 
org.apache.lucene.index.SegmentMerger.mergeDocValues(SegmentMerger.java:196)
   [junit4]   2>        at 
org.apache.lucene.index.SegmentMerger.merge(SegmentMerger.java:151)
   [junit4]   2>        at 
org.apache.lucene.index.IndexWriter.mergeMiddle(IndexWriter.java:4463)
   [junit4]   2>        at 
org.apache.lucene.index.IndexWriter.merge(IndexWriter.java:4057)
   [junit4]   2>        at 
org.apache.lucene.index.SerialMergeScheduler.merge(SerialMergeScheduler.java:40)
   [junit4]   2>        at 
org.apache.lucene.index.IndexWriter.maybeMerge(IndexWriter.java:2158)
   [junit4]   2>        at 
org.apache.lucene.index.IndexWriter.forceMerge(IndexWriter.java:1991)
   [junit4]   2>        at 
org.apache.lucene.index.IndexWriter.forceMerge(IndexWriter.java:1940)
   [junit4]   2>        at 
org.apache.lucene.index.TestDemoParallelLeafReader$2.reindex(TestDemoParallelLeafReader.java:746)
   [junit4]   2>        at 
org.apache.lucene.index.TestDemoParallelLeafReader$ReindexingReader.getParallelLeafReader(TestDemoParallelLeafReader.java:405)
   [junit4]   2>        at 
org.apache.lucene.index.TestDemoParallelLeafReader$ReindexingReader.getCurrentReader(TestDemoParallelLeafReader.java:163)
   [junit4]   2>        at 
org.apache.lucene.index.TestDemoParallelLeafReader$ReindexingReader$ReindexingMergePolicy$ReindexingOneMerge.wrapForMerge(TestDemoParallelLeafReader.java:533)
   [junit4]   2>        at 
org.apache.lucene.index.IndexWriter.mergeMiddle(IndexWriter.java:4417)
   [junit4]   2>        at 
org.apache.lucene.index.IndexWriter.merge(IndexWriter.java:4057)
   [junit4]   2>        at 
org.apache.lucene.index.ConcurrentMergeScheduler.doMerge(ConcurrentMergeScheduler.java:625)
   [junit4]   2>        at 
org.apache.lucene.index.ConcurrentMergeScheduler$MergeThread.run(ConcurrentMergeScheduler.java:662)
   [junit4]   2> 
   [junit4]   2> ??? 16, 2019 1:22:39 ?? 
com.carrotsearch.randomizedtesting.RandomizedRunner$QueueUncaughtExceptionsHandler
 uncaughtException
   [junit4]   2> ??: Uncaught exception in thread: Thread[Lucene Merge Thread 
#65,5,TGRP-TestDemoParallelLeafReader]
   [junit4]   2> org.apache.lucene.index.MergePolicy$MergeException: 
java.nio.file.FileSystemException: 
/home/jenkins/jenkins-slave/workspace/Lucene-Solr-NightlyTests-8.x/checkout/lucene/build/core/test/J2/temp/lucene.index.TestDemoParallelLeafReader_D1AD2D71F762344B-001/tempDir-002/segs/4co6e0ws25r8xxi24lsus852d_122/_0_Direct_0.dvdm:
 Too many open files
   [junit4]   2>        at 
__randomizedtesting.SeedInfo.seed([D1AD2D71F762344B]:0)
   [junit4]   2>        at 
org.apache.lucene.index.ConcurrentMergeScheduler.handleMergeException(ConcurrentMergeScheduler.java:704)
   [junit4]   2>        at 
org.apache.lucene.index.ConcurrentMergeScheduler$MergeThread.run(ConcurrentMergeScheduler.java:684)
   [junit4]   2> Caused by: java.nio.file.FileSystemException: 
/home/jenkins/jenkins-slave/workspace/Lucene-Solr-NightlyTests-8.x/checkout/lucene/build/core/test/J2/temp/lucene.index.TestDemoParallelLeafReader_D1AD2D71F762344B-001/tempDir-002/segs/4co6e0ws25r8xxi24lsus852d_122/_0_Direct_0.dvdm:
 Too many open files
   [junit4]   2>        at 
org.apache.lucene.mockfile.HandleLimitFS.onOpen(HandleLimitFS.java:48)
   [junit4]   2>        at 
org.apache.lucene.mockfile.HandleTrackingFS.callOpenHook(HandleTrackingFS.java:81)
   [junit4]   2>        at 
org.apache.lucene.mockfile.HandleTrackingFS.newOutputStream(HandleTrackingFS.java:160)
   [junit4]   2>        at 
org.apache.lucene.mockfile.FilterFileSystemProvider.newOutputStream(FilterFileSystemProvider.java:197)
   [junit4]   2>        at java.nio.file.Files.newOutputStream(Files.java:216)
   [junit4]   2>        at 
org.apache.lucene.store.FSDirectory$FSIndexOutput.<init>(FSDirectory.java:410)
   [junit4]   2>        at 
org.apache.lucene.store.FSDirectory$FSIndexOutput.<init>(FSDirectory.java:406)
   [junit4]   2>        at 
org.apache.lucene.store.FSDirectory.createOutput(FSDirectory.java:254)
   [junit4]   2>        at 
org.apache.lucene.store.MockDirectoryWrapper.createOutput(MockDirectoryWrapper.java:667)
   [junit4]   2>        at 
org.apache.lucene.store.LockValidatingDirectoryWrapper.createOutput(LockValidatingDirectoryWrapper.java:44)
   [junit4]   2>        at 
org.apache.lucene.store.TrackingDirectoryWrapper.createOutput(TrackingDirectoryWrapper.java:43)
   [junit4]   2>        at 
org.apache.lucene.codecs.memory.DirectDocValuesConsumer.<init>(DirectDocValuesConsumer.java:58)
   [junit4]   2>        at 
org.apache.lucene.codecs.memory.DirectDocValuesFormat.fieldsConsumer(DirectDocValuesFormat.java:71)
   [junit4]   2>        at 
org.apache.lucene.codecs.perfield.PerFieldDocValuesFormat$FieldsWriter.getInstance(PerFieldDocValuesFormat.java:224)
   [junit4]   2>        at 
org.apache.lucene.codecs.perfield.PerFieldDocValuesFormat$FieldsWriter.getInstance(PerFieldDocValuesFormat.java:160)
   [junit4]   2>        at 
org.apache.lucene.codecs.perfield.PerFieldDocValuesFormat$FieldsWriter.addNumericField(PerFieldDocValuesFormat.java:109)
   [junit4]   2>        at 
org.apache.lucene.index.NumericDocValuesWriter.flush(NumericDocValuesWriter.java:122)
   [junit4]   2>        at 
org.apache.lucene.index.DefaultIndexingChain.writeDocValues(DefaultIndexingChain.java:263)
   [junit4]   2>        at 
org.apache.lucene.index.DefaultIndexingChain.flush(DefaultIndexingChain.java:138)
   [junit4]   2>        at 
org.apache.lucene.index.DocumentsWriterPerThread.flush(DocumentsWriterPerThread.java:468)
   [junit4]   2>        at 
org.apache.lucene.index.DocumentsWriter.doFlush(DocumentsWriter.java:555)
   [junit4]   2>        at 
org.apache.lucene.index.DocumentsWriter.flushAllThreads(DocumentsWriter.java:722)
   [junit4]   2>        at 
org.apache.lucene.index.IndexWriter.doFlush(IndexWriter.java:3591)
   [junit4]   2>        at 
org.apache.lucene.index.IndexWriter.flush(IndexWriter.java:3566)
   [junit4]   2>        at 
org.apache.lucene.index.IndexWriter.forceMerge(IndexWriter.java:1960)
   [junit4]   2>        at 
org.apache.lucene.index.IndexWriter.forceMerge(IndexWriter.java:1940)
   [junit4]   2>        at 
org.apache.lucene.index.TestDemoParallelLeafReader$2.reindex(TestDemoParallelLeafReader.java:746)
   [junit4]   2>        at 
org.apache.lucene.index.TestDemoParallelLeafReader$ReindexingReader.getParallelLeafReader(TestDemoParallelLeafReader.java:405)
   [junit4]   2>        at 
org.apache.lucene.index.TestDemoParallelLeafReader$ReindexingReader.getCurrentReader(TestDemoParallelLeafReader.java:163)
   [junit4]   2>        at 
org.apache.lucene.index.TestDemoParallelLeafReader$ReindexingReader$ReindexingMergePolicy$ReindexingOneMerge.wrapForMerge(TestDemoParallelLeafReader.java:533)
   [junit4]   2>        at 
org.apache.lucene.index.IndexWriter.mergeMiddle(IndexWriter.java:4417)
   [junit4]   2>        at 
org.apache.lucene.index.IndexWriter.merge(IndexWriter.java:4057)
   [junit4]   2>        at 
org.apache.lucene.index.ConcurrentMergeScheduler.doMerge(ConcurrentMergeScheduler.java:625)
   [junit4]   2>        at 
org.apache.lucene.index.ConcurrentMergeScheduler$MergeThread.run(ConcurrentMergeScheduler.java:662)
   [junit4]   2> 
   [junit4]   2> ??? 16, 2019 1:22:39 ?? 
com.carrotsearch.randomizedtesting.RandomizedRunner$QueueUncaughtExceptionsHandler
 uncaughtException
   [junit4]   2> ??: Uncaught exception in thread: Thread[Lucene Merge Thread 
#62,5,TGRP-TestDemoParallelLeafReader]
   [junit4]   2> org.apache.lucene.index.MergePolicy$MergeException: 
java.nio.file.FileSystemException: 
/home/jenkins/jenkins-slave/workspace/Lucene-Solr-NightlyTests-8.x/checkout/lucene/build/core/test/J2/temp/lucene.index.TestDemoParallelLeafReader_D1AD2D71F762344B-001/tempDir-002/segs/4co6e0ws25r8xxi24lsus84y9_122/_0_Direct_0.dvdd:
 Too many open files
   [junit4]   2>        at 
__randomizedtesting.SeedInfo.seed([D1AD2D71F762344B]:0)
   [junit4]   2>        at 
org.apache.lucene.index.ConcurrentMergeScheduler.handleMergeException(ConcurrentMergeScheduler.java:704)
   [junit4]   2>        at 
org.apache.lucene.index.ConcurrentMergeScheduler$MergeThread.run(ConcurrentMergeScheduler.java:684)
   [junit4]   2> Caused by: java.nio.file.FileSystemException: 
/home/jenkins/jenkins-slave/workspace/Lucene-Solr-NightlyTests-8.x/checkout/lucene/build/core/test/J2/temp/lucene.index.TestDemoParallelLeafReader_D1AD2D71F762344B-001/tempDir-002/segs/4co6e0ws25r8xxi24lsus84y9_122/_0_Direct_0.dvdd:
 Too many open files
   [junit4]   2>        at 
org.apache.lucene.mockfile.HandleLimitFS.onOpen(HandleLimitFS.java:48)
   [junit4]   2>        at 
org.apache.lucene.mockfile.HandleTrackingFS.callOpenHook(HandleTrackingFS.java:81)
   [junit4]   2>        at 
org.apache.lucene.mockfile.HandleTrackingFS.newOutputStream(HandleTrackingFS.java:160)
   [junit4]   2>        at 
org.apache.lucene.mockfile.FilterFileSystemProvider.newOutputStream(FilterFileSystemProvider.java:197)
   [junit4]   2>        at java.nio.file.Files.newOutputStream(Files.java:216)
   [junit4]   2>        at 
org.apache.lucene.store.FSDirectory$FSIndexOutput.<init>(FSDirectory.java:410)
   [junit4]   2>        at 
org.apache.lucene.store.FSDirectory$FSIndexOutput.<init>(FSDirectory.java:406)
   [junit4]   2>        at 
org.apache.lucene.store.FSDirectory.createOutput(FSDirectory.java:254)
   [junit4]   2>        at 
org.apache.lucene.store.MockDirectoryWrapper.createOutput(MockDirectoryWrapper.java:667)
   [junit4]   2>        at 
org.apache.lucene.store.LockValidatingDirectoryWrapper.createOutput(LockValidatingDirectoryWrapper.java:44)
   [junit4]   2>        at 
org.apache.lucene.store.TrackingDirectoryWrapper.createOutput(TrackingDirectoryWrapper.java:43)
   [junit4]   2>        at 
org.apache.lucene.codecs.memory.DirectDocValuesConsumer.<init>(DirectDocValuesConsumer.java:55)
   [junit4]   2>        at 
org.apache.lucene.codecs.memory.DirectDocValuesFormat.fieldsConsumer(DirectDocValuesFormat.java:71)
   [junit4]   2>        at 
org.apache.lucene.codecs.perfield.PerFieldDocValuesFormat$FieldsWriter.getInstance(PerFieldDocValuesFormat.java:224)
   [junit4]   2>        at 
org.apache.lucene.codecs.perfield.PerFieldDocValuesFormat$FieldsWriter.getInstance(PerFieldDocValuesFormat.java:160)
   [junit4]   2>        at 
org.apache.lucene.codecs.perfield.PerFieldDocValuesFormat$FieldsWriter.addNumericField(PerFieldDocValuesFormat.java:109)
   [junit4]   2>        at 
org.apache.lucene.index.NumericDocValuesWriter.flush(NumericDocValuesWriter.java:122)
   [junit4]   2>        at 
org.apache.lucene.index.DefaultIndexingChain.writeDocValues(DefaultIndexingChain.java:263)
   [junit4]   2>        at 
org.apache.lucene.index.DefaultIndexingChain.flush(DefaultIndexingChain.java:138)
   [junit4]   2>        at 
org.apache.lucene.index.DocumentsWriterPerThread.flush(DocumentsWriterPerThread.java:468)
   [junit4]   2>        at 
org.apache.lucene.index.DocumentsWriter.doFlush(DocumentsWriter.java:555)
   [junit4]   2>        at 
org.apache.lucene.index.DocumentsWriter.flushAllThreads(DocumentsWriter.java:722)
   [junit4]   2>        at 
org.apache.lucene.index.IndexWriter.doFlush(IndexWriter.java:3591)
   [junit4]   2>        at 
org.apache.lucene.index.IndexWriter.flush(IndexWriter.java:3566)
   [junit4]   2>        at 
org.apache.lucene.index.IndexWriter.forceMerge(IndexWriter.java:1960)
   [junit4]   2>        at 
org.apache.lucene.index.IndexWriter.forceMerge(IndexWriter.java:1940)
   [junit4]   2>        at 
org.apache.lucene.index.TestDemoParallelLeafReader$2.reindex(TestDemoParallelLeafReader.java:746)
   [junit4]   2>        at 
org.apache.lucene.index.TestDemoParallelLeafReader$ReindexingReader.getParallelLeafReader(TestDemoParallelLeafReader.java:405)
   [junit4]   2>        at 
org.apache.lucene.index.TestDemoParallelLeafReader$ReindexingReader.getCurrentReader(TestDemoParallelLeafReader.java:163)
   [junit4]   2>        at 
org.apache.lucene.index.TestDemoParallelLeafReader$ReindexingReader$ReindexingMergePolicy$ReindexingOneMerge.wrapForMerge(TestDemoParallelLeafReader.java:533)
   [junit4]   2>        at 
org.apache.lucene.index.IndexWriter.mergeMiddle(IndexWriter.java:4417)
   [junit4]   2>        at 
org.apache.lucene.index.IndexWriter.merge(IndexWriter.java:4057)
   [junit4]   2>        at 
org.apache.lucene.index.ConcurrentMergeScheduler.doMerge(ConcurrentMergeScheduler.java:625)
   [junit4]   2>        at 
org.apache.lucene.index.ConcurrentMergeScheduler$MergeThread.run(ConcurrentMergeScheduler.java:662)
   [junit4]   2> 
   [junit4]   2> ??? 16, 2019 1:22:39 ?? 
com.carrotsearch.randomizedtesting.RandomizedRunner$QueueUncaughtExceptionsHandler
 uncaughtException
   [junit4]   2> ??: Uncaught exception in thread: Thread[Lucene Merge Thread 
#61,5,TGRP-TestDemoParallelLeafReader]
   [junit4]   2> org.apache.lucene.index.MergePolicy$MergeException: 
java.nio.file.FileSystemException: 
/home/jenkins/jenkins-slave/workspace/Lucene-Solr-NightlyTests-8.x/checkout/lucene/build/core/test/J2/temp/lucene.index.TestDemoParallelLeafReader_D1AD2D71F762344B-001/tempDir-002/segs/4co6e0ws25r8xxi24lsus84vt_122/_0_Direct_0.dvdm:
 Too many open files
   [junit4]   2>        at 
__randomizedtesting.SeedInfo.seed([D1AD2D71F762344B]:0)
   [junit4]   2>        at 
org.apache.lucene.index.ConcurrentMergeScheduler.handleMergeException(ConcurrentMergeScheduler.java:704)
   [junit4]   2>        at 
org.apache.lucene.index.ConcurrentMergeScheduler$MergeThread.run(ConcurrentMergeScheduler.java:684)
   [junit4]   2> Caused by: java.nio.file.FileSystemException: 
/home/jenkins/jenkins-slave/workspace/Lucene-Solr-NightlyTests-8.x/checkout/lucene/build/core/test/J2/temp/lucene.index.TestDemoParallelLeafReader_D1AD2D71F762344B-001/tempDir-002/segs/4co6e0ws25r8xxi24lsus84vt_122/_0_Direct_0.dvdm:
 Too many open files
   [junit4]   2>        at 
org.apache.lucene.mockfile.HandleLimitFS.onOpen(HandleLimitFS.java:48)
   [junit4]   2>        at 
org.apache.lucene.mockfile.HandleTrackingFS.callOpenHook(HandleTrackingFS.java:81)
   [junit4]   2>        at 
org.apache.lucene.mockfile.HandleTrackingFS.newOutputStream(HandleTrackingFS.java:160)
   [junit4]   2>        at 
org.apache.lucene.mockfile.FilterFileSystemProvider.newOutputStream(FilterFileSystemProvider.java:197)
   [junit4]   2>        at java.nio.file.Files.newOutputStream(Files.java:216)
   [junit4]   2>        at 
org.apache.lucene.store.FSDirectory$FSIndexOutput.<init>(FSDirectory.java:410)
   [junit4]   2>        at 
org.apache.lucene.store.FSDirectory$FSIndexOutput.<init>(FSDirectory.java:406)
   [junit4]   2>        at 
org.apache.lucene.store.FSDirectory.createOutput(FSDirectory.java:254)
   [junit4]   2>        at 
org.apache.lucene.store.MockDirectoryWrapper.createOutput(MockDirectoryWrapper.java:667)
   [junit4]   2>        at 
org.apache.lucene.store.LockValidatingDirectoryWrapper.createOutput(LockValidatingDirectoryWrapper.java:44)
   [junit4]   2>        at 
org.apache.lucene.store.TrackingDirectoryWrapper.createOutput(TrackingDirectoryWrapper.java:43)
   [junit4]   2>        at 
org.apache.lucene.codecs.memory.DirectDocValuesConsumer.<init>(DirectDocValuesConsumer.java:58)
   [junit4]   2>        at 
org.apache.lucene.codecs.memory.DirectDocValuesFormat.fieldsConsumer(DirectDocValuesFormat.java:71)
   [junit4]   2>        at 
org.apache.lucene.codecs.perfield.PerFieldDocValuesFormat$FieldsWriter.getInstance(PerFieldDocValuesFormat.java:224)
   [junit4]   2>        at 
org.apache.lucene.codecs.perfield.PerFieldDocValuesFormat$FieldsWriter.getInstance(PerFieldDocValuesFormat.java:160)
   [junit4]   2>        at 
org.apache.lucene.codecs.perfield.PerFieldDocValuesFormat$FieldsWriter.addNumericField(PerFieldDocValuesFormat.java:109)
   [junit4]   2>        at 
org.apache.lucene.index.NumericDocValuesWriter.flush(NumericDocValuesWriter.java:122)
   [junit4]   2>        at 
org.apache.lucene.index.DefaultIndexingChain.writeDocValues(DefaultIndexingChain.java:263)
   [junit4]   2>        at 
org.apache.lucene.index.DefaultIndexingChain.flush(DefaultIndexingChain.java:138)
   [junit4]   2>        at 
org.apache.lucene.index.DocumentsWriterPerThread.flush(DocumentsWriterPerThread.java:468)
   [junit4]   2>        at 
org.apache.lucene.index.DocumentsWriter.doFlush(DocumentsWriter.java:555)
   [junit4]   2>        at 
org.apache.lucene.index.DocumentsWriter.flushAllThreads(DocumentsWriter.java:722)
   [junit4]   2>        at 
org.apache.lucene.index.IndexWriter.doFlush(IndexWriter.java:3591)
   [junit4]   2>        at 
org.apache.lucene.index.IndexWriter.flush(IndexWriter.java:3566)
   [junit4]   2>        at 
org.apache.lucene.index.IndexWriter.forceMerge(IndexWriter.java:1960)
   [junit4]   2>        at 
org.apache.lucene.index.IndexWriter.forceMerge(IndexWriter.java:1940)
   [junit4]   2>        at 
org.apache.lucene.index.TestDemoParallelLeafReader$2.reindex(TestDemoParallelLeafReader.java:746)
   [junit4]   2>        at 
org.apache.lucene.index.TestDemoParallelLeafReader$ReindexingReader.getParallelLeafReader(TestDemoParallelLeafReader.java:405)
   [junit4]   2>        at 
org.apache.lucene.index.TestDemoParallelLeafReader$ReindexingReader.getCurrentReader(TestDemoParallelLeafReader.java:163)
   [junit4]   2>        at 
org.apache.lucene.index.TestDemoParallelLeafReader$ReindexingReader$ReindexingMergePolicy$ReindexingOneMerge.wrapForMerge(TestDemoParallelLeafReader.java:533)
   [junit4]   2>        at 
org.apache.lucene.index.IndexWriter.mergeMiddle(IndexWriter.java:4417)
   [junit4]   2>        at 
org.apache.lucene.index.IndexWriter.merge(IndexWriter.java:4057)
   [junit4]   2>        at 
org.apache.lucene.index.ConcurrentMergeScheduler.doMerge(ConcurrentMergeScheduler.java:625)
   [junit4]   2>        at 
org.apache.lucene.index.ConcurrentMergeScheduler$MergeThread.run(ConcurrentMergeScheduler.java:662)
   [junit4]   2> 
   [junit4]   2> ??? 16, 2019 1:22:39 ?? 
com.carrotsearch.randomizedtesting.RandomizedRunner$QueueUncaughtExceptionsHandler
 uncaughtException
   [junit4]   2> ??: Uncaught exception in thread: Thread[Lucene Merge Thread 
#0,5,TGRP-TestDemoParallelLeafReader]
   [junit4]   2> org.apache.lucene.index.MergePolicy$MergeException: 
java.nio.file.FileSystemException: 
/home/jenkins/jenkins-slave/workspace/Lucene-Solr-NightlyTests-8.x/checkout/lucene/build/core/test/J2/temp/lucene.index.TestDemoParallelLeafReader_D1AD2D71F762344B-001/tempDir-002/segs/4co6e0ws25r8xxi24lsus84v8_122/_1_Lucene80_0.dvm:
 Too many open files
   [junit4]   2>        at 
__randomizedtesting.SeedInfo.seed([D1AD2D71F762344B]:0)
   [junit4]   2>        at 
org.apache.lucene.index.ConcurrentMergeScheduler.handleMergeException(ConcurrentMergeScheduler.java:704)
   [junit4]   2>        at 
org.apache.lucene.index.ConcurrentMergeScheduler$MergeThread.run(ConcurrentMergeScheduler.java:684)
   [junit4]   2> Caused by: java.nio.file.FileSystemException: 
/home/jenkins/jenkins-slave/workspace/Lucene-Solr-NightlyTests-8.x/checkout/lucene/build/core/test/J2/temp/lucene.index.TestDemoParallelLeafReader_D1AD2D71F762344B-001/tempDir-002/segs/4co6e0ws25r8xxi24lsus84v8_122/_1_Lucene80_0.dvm:
 Too many open files
   [junit4]   2>        at 
org.apache.lucene.mockfile.HandleLimitFS.onOpen(HandleLimitFS.java:48)
   [junit4]   2>        at 
org.apache.lucene.mockfile.HandleTrackingFS.callOpenHook(HandleTrackingFS.java:81)
   [junit4]   2>        at 
org.apache.lucene.mockfile.HandleTrackingFS.newOutputStream(HandleTrackingFS.java:160)
   [junit4]   2>        at 
org.apache.lucene.mockfile.FilterFileSystemProvider.newOutputStream(FilterFileSystemProvider.java:197)
   [junit4]   2>        at java.nio.file.Files.newOutputStream(Files.java:216)
   [junit4]   2>        at 
org.apache.lucene.store.FSDirectory$FSIndexOutput.<init>(FSDirectory.java:410)
   [junit4]   2>        at 
org.apache.lucene.store.FSDirectory$FSIndexOutput.<init>(FSDirectory.java:406)
   [junit4]   2>        at 
org.apache.lucene.store.FSDirectory.createOutput(FSDirectory.java:254)
   [junit4]   2>        at 
org.apache.lucene.store.MockDirectoryWrapper.createOutput(MockDirectoryWrapper.java:667)
   [junit4]   2>        at 
org.apache.lucene.store.LockValidatingDirectoryWrapper.createOutput(LockValidatingDirectoryWrapper.java:44)
   [junit4]   2>        at 
org.apache.lucene.index.ConcurrentMergeScheduler$1.createOutput(ConcurrentMergeScheduler.java:288)
   [junit4]   2>        at 
org.apache.lucene.store.TrackingDirectoryWrapper.createOutput(TrackingDirectoryWrapper.java:43)
   [junit4]   2>        at 
org.apache.lucene.codecs.lucene80.Lucene80DocValuesConsumer.<init>(Lucene80DocValuesConsumer.java:73)
   [junit4]   2>        at 
org.apache.lucene.codecs.lucene80.Lucene80DocValuesFormat.fieldsConsumer(Lucene80DocValuesFormat.java:141)
   [junit4]   2>        at 
org.apache.lucene.codecs.perfield.PerFieldDocValuesFormat$FieldsWriter.getInstance(PerFieldDocValuesFormat.java:224)
   [junit4]   2>        at 
org.apache.lucene.codecs.perfield.PerFieldDocValuesFormat$FieldsWriter.merge(PerFieldDocValuesFormat.java:139)
   [junit4]   2>        at 
org.apache.lucene.index.SegmentMerger.mergeDocValues(SegmentMerger.java:196)
   [junit4]   2>        at 
org.apache.lucene.index.SegmentMerger.merge(SegmentMerger.java:151)
   [junit4]   2>        at 
org.apache.lucene.index.IndexWriter.mergeMiddle(IndexWriter.java:4463)
   [junit4]   2>        at 
org.apache.lucene.index.IndexWriter.merge(IndexWriter.java:4057)
   [junit4]   2>        at 
org.apache.lucene.index.ConcurrentMergeScheduler.doMerge(ConcurrentMergeScheduler.java:625)
   [junit4]   2>        at 
org.apache.lucene.index.ConcurrentMergeScheduler$MergeThread.run(ConcurrentMergeScheduler.java:662)
   [junit4]   2> 
   [junit4]   2> ??? 16, 2019 1:22:39 ?? 
com.carrotsearch.randomizedtesting.RandomizedRunner$QueueUncaughtExceptionsHandler
 uncaughtException
   [junit4]   2> ??: Uncaught exception in thread: Thread[Lucene Merge Thread 
#0,5,TGRP-TestDemoParallelLeafReader]
   [junit4]   2> org.apache.lucene.index.MergePolicy$MergeException: 
java.nio.file.FileSystemException: 
/home/jenkins/jenkins-slave/workspace/Lucene-Solr-NightlyTests-8.x/checkout/lucene/build/core/test/J2/temp/lucene.index.TestDemoParallelLeafReader_D1AD2D71F762344B-001/tempDir-002/segs/4co6e0ws25r8xxi24lsus84u5_122/_2_Lucene80_0.dvm:
 Too many open files
   [junit4]   2>        at 
__randomizedtesting.SeedInfo.seed([D1AD2D71F762344B]:0)
   [junit4]   2>        at 
org.apache.lucene.index.ConcurrentMergeScheduler.handleMergeException(ConcurrentMergeScheduler.java:704)
   [junit4]   2>        at 
org.apache.lucene.index.ConcurrentMergeScheduler$MergeThread.run(ConcurrentMergeScheduler.java:684)
   [junit4]   2> Caused by: java.nio.file.FileSystemException: 
/home/jenkins/jenkins-slave/workspace/Lucene-Solr-NightlyTests-8.x/checkout/lucene/build/core/test/J2/temp/lucene.index.TestDemoParallelLeafReader_D1AD2D71F762344B-001/tempDir-002/segs/4co6e0ws25r8xxi24lsus84u5_122/_2_Lucene80_0.dvm:
 Too many open files
   [junit4]   2>        at 
org.apache.lucene.mockfile.HandleLimitFS.onOpen(HandleLimitFS.java:48)
   [junit4]   2>        at 
org.apache.lucene.mockfile.HandleTrackingFS.callOpenHook(HandleTrackingFS.java:81)
   [junit4]   2>        at 
org.apache.lucene.mockfile.HandleTrackingFS.newOutputStream(HandleTrackingFS.java:160)
   [junit4]   2>        at 
org.apache.lucene.mockfile.FilterFileSystemProvider.newOutputStream(FilterFileSystemProvider.java:197)
   [junit4]   2>        at java.nio.file.Files.newOutputStream(Files.java:216)
   [junit4]   2>        at 
org.apache.lucene.store.FSDirectory$FSIndexOutput.<init>(FSDirectory.java:410)
   [junit4]   2>        at 
org.apache.lucene.store.FSDirectory$FSIndexOutput.<init>(FSDirectory.java:406)
   [junit4]   2>        at 
org.apache.lucene.store.FSDirectory.createOutput(FSDirectory.java:254)
   [junit4]   2>        at 
org.apache.lucene.store.MockDirectoryWrapper.createOutput(MockDirectoryWrapper.java:667)
   [junit4]   2>        at 
org.apache.lucene.store.LockValidatingDirectoryWrapper.createOutput(LockValidatingDirectoryWrapper.java:44)
   [junit4]   2>        at 
org.apache.lucene.index.ConcurrentMergeScheduler$1.createOutput(ConcurrentMergeScheduler.java:288)
   [junit4]   2>        at 
org.apache.lucene.store.TrackingDirectoryWrapper.createOutput(TrackingDirectoryWrapper.java:43)
   [junit4]   2>        at 
org.apache.lucene.codecs.lucene80.Lucene80DocValuesConsumer.<init>(Lucene80DocValuesConsumer.java:73)
   [junit4]   2>        at 
org.apache.lucene.codecs.lucene80.Lucene80DocValuesFormat.fieldsConsumer(Lucene80DocValuesFormat.java:141)
   [junit4]   2>        at 
org.apache.lucene.codecs.perfield.PerFieldDocValuesFormat$FieldsWriter.getInstance(PerFieldDocValuesFormat.java:224)
   [junit4]   2>        at 
org.apache.lucene.codecs.perfield.PerFieldDocValuesFormat$FieldsWriter.merge(PerFieldDocValuesFormat.java:139)
   [junit4]   2>        at 
org.apache.lucene.index.SegmentMerger.mergeDocValues(SegmentMerger.java:196)
   [junit4]   2>        at 
org.apache.lucene.index.SegmentMerger.merge(SegmentMerger.java:151)
   [junit4]   2>        at 
org.apache.lucene.index.IndexWriter.mergeMiddle(IndexWriter.java:4463)
   [junit4]   2>        at 
org.apache.lucene.index.IndexWriter.merge(IndexWriter.java:4057)
   [junit4]   2>        at 
org.apache.lucene.index.ConcurrentMergeScheduler.doMerge(ConcurrentMergeScheduler.java:625)
   [junit4]   2>        at 
org.apache.lucene.index.ConcurrentMergeScheduler$MergeThread.run(ConcurrentMergeScheduler.java:662)
   [junit4]   2> 
   [junit4]   2> ??? 16, 2019 1:22:39 ?? 
com.carrotsearch.randomizedtesting.RandomizedRunner$QueueUncaughtExceptionsHandler
 uncaughtException
   [junit4]   2> ??: Uncaught exception in thread: Thread[Lucene Merge Thread 
#59,5,TGRP-TestDemoParallelLeafReader]
   [junit4]   2> org.apache.lucene.index.MergePolicy$MergeException: 
java.lang.IllegalStateException: this writer hit an unrecoverable error; cannot 
complete forceMerge
   [junit4]   2>        at 
__randomizedtesting.SeedInfo.seed([D1AD2D71F762344B]:0)
   [junit4]   2>        at 
org.apache.lucene.index.ConcurrentMergeScheduler.handleMergeException(ConcurrentMergeScheduler.java:704)
   [junit4]   2>        at 
org.apache.lucene.index.ConcurrentMergeScheduler$MergeThread.run(ConcurrentMergeScheduler.java:684)
   [junit4]   2> Caused by: java.lang.IllegalStateException: this writer hit an 
unrecoverable error; cannot complete forceMerge
   [junit4]   2>        at 
org.apache.lucene.index.IndexWriter.forceMerge(IndexWriter.java:1998)
   [junit4]   2>        at 
org.apache.lucene.index.IndexWriter.forceMerge(IndexWriter.java:1940)
   [junit4]   2>        at 
org.apache.lucene.index.TestDemoParallelLeafReader$2.reindex(TestDemoParallelLeafReader.java:746)
   [junit4]   2>        at 
org.apache.lucene.index.TestDemoParallelLeafReader$ReindexingReader.getParallelLeafReader(TestDemoParallelLeafReader.java:405)
   [junit4]   2>        at 
org.apache.lucene.index.TestDemoParallelLeafReader$ReindexingReader.getCurrentReader(TestDemoParallelLeafReader.java:163)
   [junit4]   2>        at 
org.apache.lucene.index.TestDemoParallelLeafReader$ReindexingReader$ReindexingMergePolicy$ReindexingOneMerge.wrapForMerge(TestDemoParallelLeafReader.java:533)
   [junit4]   2>        at 
org.apache.lucene.index.IndexWriter.mergeMiddle(IndexWriter.java:4417)
   [junit4]   2>        at 
org.apache.lucene.index.IndexWriter.merge(IndexWriter.java:4057)
   [junit4]   2>        at 
org.apache.lucene.index.ConcurrentMergeScheduler.doMerge(ConcurrentMergeScheduler.java:625)
   [junit4]   2>        at 
org.apache.lucene.index.ConcurrentMergeScheduler$MergeThread.run(ConcurrentMergeScheduler.java:662)
   [junit4]   2> Caused by: java.nio.file.FileSystemException: 
/home/jenkins/jenkins-slave/workspace/Lucene-Solr-NightlyTests-8.x/checkout/lucene/build/core/test/J2/temp/lucene.index.TestDemoParallelLeafReader_D1AD2D71F762344B-001/tempDir-002/segs/4co6e0ws25r8xxi24lsus84v8_122/_1_Lucene80_0.dvm:
 Too many open files
   [junit4]   2>        at 
org.apache.lucene.mockfile.HandleLimitFS.onOpen(HandleLimitFS.java:48)
   [junit4]   2>        at 
org.apache.lucene.mockfile.HandleTrackingFS.callOpenHook(HandleTrackingFS.java:81)
   [junit4]   2>        at 
org.apache.lucene.mockfile.HandleTrackingFS.newOutputStream(HandleTrackingFS.java:160)
   [junit4]   2>        at 
org.apache.lucene.mockfile.FilterFileSystemProvider.newOutputStream(FilterFileSystemProvider.java:197)
   [junit4]   2>        at java.nio.file.Files.newOutputStream(Files.java:216)
   [junit4]   2>        at 
org.apache.lucene.store.FSDirectory$FSIndexOutput.<init>(FSDirectory.java:410)
   [junit4]   2>        at 
org.apache.lucene.store.FSDirectory$FSIndexOutput.<init>(FSDirectory.java:406)
   [junit4]   2>        at 
org.apache.lucene.store.FSDirectory.createOutput(FSDirectory.java:254)
   [junit4]   2>        at 
org.apache.lucene.store.MockDirectoryWrapper.createOutput(MockDirectoryWrapper.java:667)
   [junit4]   2>        at 
org.apache.lucene.store.LockValidatingDirectoryWrapper.createOutput(LockValidatingDirectoryWrapper.java:44)
   [junit4]   2>        at 
org.apache.lucene.index.ConcurrentMergeScheduler$1.createOutput(ConcurrentMergeScheduler.java:288)
   [junit4]   2>        at 
org.apache.lucene.store.TrackingDirectoryWrapper.createOutput(TrackingDirectoryWrapper.java:43)
   [junit4]   2>        at 
org.apache.lucene.codecs.lucene80.Lucene80DocValuesConsumer.<init>(Lucene80DocValuesConsumer.java:73)
   [junit4]   2>        at 
org.apache.lucene.codecs.lucene80.Lucene80DocValuesFormat.fieldsConsumer(Lucene80DocValuesFormat.java:141)
   [junit4]   2>        at 
org.apache.lucene.codecs.perfield.PerFieldDocValuesFormat$FieldsWriter.getInstance(PerFieldDocValuesFormat.java:224)
   [junit4]   2>        at 
org.apache.lucene.codecs.perfield.PerFieldDocValuesFormat$FieldsWriter.merge(PerFieldDocValuesFormat.java:139)
   [junit4]   2>        at 
org.apache.lucene.index.SegmentMerger.mergeDocValues(SegmentMerger.java:196)
   [junit4]   2>        at 
org.apache.lucene.index.SegmentMerger.merge(SegmentMerger.java:151)
   [junit4]   2>        at 
org.apache.lucene.index.IndexWriter.mergeMiddle(IndexWriter.java:4463)
   [junit4]   2>        ... 3 more
   [junit4]   2> 
   [junit4]   2> ??? 16, 2019 1:22:39 ?? 
com.carrotsearch.randomizedtesting.RandomizedRunner$QueueUncaughtExceptionsHandler
 uncaughtException
   [junit4]   2> ??: Uncaught exception in thread: Thread[Lucene Merge Thread 
#60,5,TGRP-TestDemoParallelLeafReader]
   [junit4]   2> org.apache.lucene.index.MergePolicy$MergeException: 
java.nio.file.FileSystemException: 
/home/jenkins/jenkins-slave/workspace/Lucene-Solr-NightlyTests-8.x/checkout/lucene/build/core/test/J2/temp/lucene.index.TestDemoParallelLeafReader_D1AD2D71F762344B-001/tempDir-002/segs/4co6e0ws25r8xxi24lsus84vz_122/_0_Direct_0.dvdd:
 Too many open files
   [junit4]   2>        at 
__randomizedtesting.SeedInfo.seed([D1AD2D71F762344B]:0)
   [junit4]   2>        at 
org.apache.lucene.index.ConcurrentMergeScheduler.handleMergeException(ConcurrentMergeScheduler.java:704)
   [junit4]   2>        at 
org.apache.lucene.index.ConcurrentMergeScheduler$MergeThread.run(ConcurrentMergeScheduler.java:684)
   [junit4]   2> Caused by: java.nio.file.FileSystemException: 
/home/jenkins/jenkins-slave/workspace/Lucene-Solr-NightlyTests-8.x/checkout/lucene/build/core/test/J2/temp/lucene.index.TestDemoParallelLeafReader_D1AD2D71F762344B-001/tempDir-002/segs/4co6e0ws25r8xxi24lsus84vz_122/_0_Direct_0.dvdd:
 Too many open files
   [junit4]   2>        at 
org.apache.lucene.mockfile.HandleLimitFS.onOpen(HandleLimitFS.java:48)
   [junit4]   2>        at 
org.apache.lucene.mockfile.HandleTrackingFS.callOpenHook(HandleTrackingFS.java:81)
   [junit4]   2>        at 
org.apache.lucene.mockfile.HandleTrackingFS.newOutputStream(HandleTrackingFS.java:160)
   [junit4]   2>        at 
org.apache.lucene.mockfile.FilterFileSystemProvider.newOutputStream(FilterFileSystemProvider.java:197)
   [junit4]   2>        at java.nio.file.Files.newOutputStream(Files.java:216)
   [junit4]   2>        at 
org.apache.lucene.store.FSDirectory$FSIndexOutput.<init>(FSDirectory.java:410)
   [junit4]   2>        at 
org.apache.lucene.store.FSDirectory$FSIndexOutput.<init>(FSDirectory.java:406)
   [junit4]   2>        at 
org.apache.lucene.store.FSDirectory.createOutput(FSDirectory.java:254)
   [junit4]   2>        at 
org.apache.lucene.store.MockDirectoryWrapper.createOutput(MockDirectoryWrapper.java:667)
   [junit4]   2>        at 
org.apache.lucene.store.LockValidatingDirectoryWrapper.createOutput(LockValidatingDirectoryWrapper.java:44)
   [junit4]   2>        at 
org.apache.lucene.store.TrackingDirectoryWrapper.createOutput(TrackingDirectoryWrapper.java:43)
   [junit4]   2>        at 
org.apache.lucene.codecs.memory.DirectDocValuesConsumer.<init>(DirectDocValuesConsumer.java:55)
   [junit4]   2>        at 
org.apache.lucene.codecs.memory.DirectDocValuesFormat.fieldsConsumer(DirectDocValuesFormat.java:71)
   [junit4]   2>        at 
org.apache.lucene.codecs.perfield.PerFieldDocValuesFormat$FieldsWriter.getInstance(PerFieldDocValuesFormat.java:224)
   [junit4]   2>        at 
org.apache.lucene.codecs.perfield.PerFieldDocValuesFormat$FieldsWriter.getInstance(PerFieldDocValuesFormat.java:160)
   [junit4]   2>        at 
org.apache.lucene.codecs.perfield.PerFieldDocValuesFormat$FieldsWriter.addNumericField(PerFieldDocValuesFormat.java:109)
   [junit4]   2>        at 
org.apache.lucene.index.NumericDocValuesWriter.flush(NumericDocValuesWriter.java:122)
   [junit4]   2>        at 
org.apache.lucene.index.DefaultIndexingChain.writeDocValues(DefaultIndexingChain.java:263)
   [junit4]   2>        at 
org.apache.lucene.index.DefaultIndexingChain.flush(DefaultIndexingChain.java:138)
   [junit4]   2>        at 
org.apache.lucene.index.DocumentsWriterPerThread.flush(DocumentsWriterPerThread.java:468)
   [junit4]   2>        at 
org.apache.lucene.index.DocumentsWriter.doFlush(DocumentsWriter.java:555)
   [junit4]   2>        at 
org.apache.lucene.index.DocumentsWriter.flushAllThreads(DocumentsWriter.java:722)
   [junit4]   2>        at 
org.apache.lucene.index.IndexWriter.doFlush(IndexWriter.java:3591)
   [junit4]   2>        at 
org.apache.lucene.index.IndexWriter.flush(IndexWriter.java:3566)
   [junit4]   2>        at 
org.apache.lucene.index.IndexWriter.forceMerge(IndexWriter.java:1960)
   [junit4]   2>        at 
org.apache.lucene.index.IndexWriter.forceMerge(IndexWriter.java:1940)
   [junit4]   2>        at 
org.apache.lucene.index.TestDemoParallelLeafReader$2.reindex(TestDemoParallelLeafReader.java:746)
   [junit4]   2>        at 
org.apache.lucene.index.TestDemoParallelLeafReader$ReindexingReader.getParallelLeafReader(TestDemoParallelLeafReader.java:405)
   [junit4]   2>        at 
org.apache.lucene.index.TestDemoParallelLeafReader$ReindexingReader.getCurrentReader(TestDemoParallelLeafReader.java:163)
   [junit4]   2>        at 
org.apache.lucene.index.TestDemoParallelLeafReader$ReindexingReader$ReindexingMergePolicy$ReindexingOneMerge.wrapForMerge(TestDemoParallelLeafReader.java:533)
   [junit4]   2>        at 
org.apache.lucene.index.IndexWriter.mergeMiddle(IndexWriter.java:4417)
   [junit4]   2>        at 
org.apache.lucene.index.IndexWriter.merge(IndexWriter.java:4057)
   [junit4]   2>        at 
org.apache.lucene.index.ConcurrentMergeScheduler.doMerge(ConcurrentMergeScheduler.java:625)
   [junit4]   2>        at 
org.apache.lucene.index.ConcurrentMergeScheduler$MergeThread.run(ConcurrentMergeScheduler.java:662)
   [junit4]   2> 
   [junit4]   2> ??? 16, 2019 1:22:39 ?? 
com.carrotsearch.randomizedtesting.RandomizedRunner$QueueUncaughtExceptionsHandler
 uncaughtException
   [junit4]   2> ??: Uncaught exception in thread: Thread[Lucene Merge Thread 
#63,5,TGRP-TestDemoParallelLeafReader]
   [junit4]   2> org.apache.lucene.index.MergePolicy$MergeException: 
java.nio.file.FileSystemException: 
/home/jenkins/jenkins-slave/workspace/Lucene-Solr-NightlyTests-8.x/checkout/lucene/build/core/test/J2/temp/lucene.index.TestDemoParallelLeafReader_D1AD2D71F762344B-001/tempDir-002/segs/4co6e0ws25r8xxi24lsus850j_122/_0.dim:
 Too many open files
   [junit4]   2>        at 
__randomizedtesting.SeedInfo.seed([D1AD2D71F762344B]:0)
   [junit4]   2>        at 
org.apache.lucene.index.ConcurrentMergeScheduler.handleMergeException(ConcurrentMergeScheduler.java:704)
   [junit4]   2>        at 
org.apache.lucene.index.ConcurrentMergeScheduler$MergeThread.run(ConcurrentMergeScheduler.java:684)
   [junit4]   2> Caused by: java.nio.file.FileSystemException: 
/home/jenkins/jenkins-slave/workspace/Lucene-Solr-NightlyTests-8.x/checkout/lucene/build/core/test/J2/temp/lucene.index.TestDemoParallelLeafReader_D1AD2D71F762344B-001/tempDir-002/segs/4co6e0ws25r8xxi24lsus850j_122/_0.dim:
 Too many open files
   [junit4]   2>        at 
org.apache.lucene.mockfile.HandleLimitFS.onOpen(HandleLimitFS.java:48)
   [junit4]   2>        at 
org.apache.lucene.mockfile.HandleTrackingFS.callOpenHook(HandleTrackingFS.java:81)
   [junit4]   2>        at 
org.apache.lucene.mockfile.HandleTrackingFS.newByteChannel(HandleTrackingFS.java:271)
   [junit4]   2>        at 
org.apache.lucene.mockfile.FilterFileSystemProvider.newByteChannel(FilterFileSystemProvider.java:212)
   [junit4]   2>        at java.nio.file.Files.newByteChannel(Files.java:361)
   [junit4]   2>        at java.nio.file.Files.newByteChannel(Files.java:407)
   [junit4]   2>        at 
org.apache.lucene.store.SimpleFSDirectory.openInput(SimpleFSDirectory.java:77)
   [junit4]   2>        at 
org.apache.lucene.store.NRTCachingDirectory.openInput(NRTCachingDirectory.java:181)
   [junit4]   2>        at 
org.apache.lucene.util.LuceneTestCase.slowFileExists(LuceneTestCase.java:2862)
   [junit4]   2>        at 
org.apache.lucene.store.MockDirectoryWrapper.openInput(MockDirectoryWrapper.java:747)
   [junit4]   2>        at 
org.apache.lucene.store.FilterDirectory.openInput(FilterDirectory.java:100)
   [junit4]   2>        at 
org.apache.lucene.store.FilterDirectory.openInput(FilterDirectory.java:100)
   [junit4]   2>        at 
org.apache.lucene.store.FilterDirectory.openInput(FilterDirectory.java:100)
   [junit4]   2>        at 
org.apache.lucene.store.Directory.openChecksumInput(Directory.java:157)
   [junit4]   2>        at 
org.apache.lucene.codecs.lucene50.Lucene50CompoundFormat.write(Lucene50CompoundFormat.java:89)
   [junit4]   2>        at 
org.apache.lucene.index.IndexWriter.createCompoundFile(IndexWriter.java:5014)
   [junit4]   2>        at 
org.apache.lucene.index.DocumentsWriterPerThread.sealFlushedSegment(DocumentsWriterPerThread.java:574)
   [junit4]   2>        at 
org.apache.lucene.index.DocumentsWriterPerThread.flush(DocumentsWriterPerThread.java:513)
   [junit4]   2>        at 
org.apache.lucene.index.DocumentsWriter.doFlush(DocumentsWriter.java:555)
   [junit4]   2>        at 
org.apache.lucene.index.DocumentsWriter.flushAllThreads(DocumentsWriter.java:722)
   [junit4]   2>        at 
org.apache.lucene.index.IndexWriter.doFlush(IndexWriter.java:3591)
   [junit4]   2>        at 
org.apache.lucene.index.IndexWriter.flush(IndexWriter.java:3566)
   [junit4]   2>        at 
org.apache.lucene.index.IndexWriter.forceMerge(IndexWriter.java:1960)
   [junit4]   2>        at 
org.apache.lucene.index.IndexWriter.forceMerge(IndexWriter.java:1940)
   [junit4]   2>        at 
org.apache.lucene.index.TestDemoParallelLeafReader$2.reindex(TestDemoParallelLeafReader.java:746)
   [junit4]   2>        at 
org.apache.lucene.index.TestDemoParallelLeafReader$ReindexingReader.getParallelLeafReader(TestDemoParallelLeafReader.java:405)
   [junit4]   2>        at 
org.apache.lucene.index.TestDemoParallelLeafReader$ReindexingReader.getCurrentReader(TestDemoParallelLeafReader.java:163)
   [junit4]   2>        at 
org.apache.lucene.index.TestDemoParallelLeafReader$ReindexingReader$ReindexingMergePolicy$ReindexingOneMerge.wrapForMerge(TestDemoParallelLeafReader.java:533)
   [junit4]   2>        at 
org.apache.lucene.index.IndexWriter.mergeMiddle(IndexWriter.java:4417)
   [junit4]   2>        at 
org.apache.lucene.index.IndexWriter.merge(IndexWriter.java:4057)
   [junit4]   2>        at 
org.apache.lucene.index.ConcurrentMergeScheduler.doMerge(ConcurrentMergeScheduler.java:625)
   [junit4]   2>        at 
org.apache.lucene.index.ConcurrentMergeScheduler$MergeThread.run(ConcurrentMergeScheduler.java:662)
   [junit4]   2> 
   [junit4]   2> ??? 16, 2019 1:22:39 ?? 
com.carrotsearch.randomizedtesting.RandomizedRunner$QueueUncaughtExceptionsHandler
 uncaughtException
   [junit4]   2> ??: Uncaught exception in thread: Thread[Lucene Merge Thread 
#56,5,TGRP-TestDemoParallelLeafReader]
   [junit4]   2> org.apache.lucene.index.MergePolicy$MergeException: 
java.nio.file.FileSystemException: 
/home/jenkins/jenkins-slave/workspace/Lucene-Solr-NightlyTests-8.x/checkout/lucene/build/core/test/J2/temp/lucene.index.TestDemoParallelLeafReader_D1AD2D71F762344B-001/tempDir-002/segs/4co6e0ws25r8xxi24lsus84td_122/_0.fdt:
 Too many open files
   [junit4]   2>        at 
__randomizedtesting.SeedInfo.seed([D1AD2D71F762344B]:0)
   [junit4]   2>        at 
org.apache.lucene.index.ConcurrentMergeScheduler.handleMergeException(ConcurrentMergeScheduler.java:704)
   [junit4]   2>        at 
org.apache.lucene.index.ConcurrentMergeScheduler$MergeThread.run(ConcurrentMergeScheduler.java:684)
   [junit4]   2> Caused by: java.nio.file.FileSystemException: 
/home/jenkins/jenkins-slave/workspace/Lucene-Solr-NightlyTests-8.x/checkout/lucene/build/core/test/J2/temp/lucene.index.TestDemoParallelLeafReader_D1AD2D71F762344B-001/tempDir-002/segs/4co6e0ws25r8xxi24lsus84td_122/_0.fdt:
 Too many open files
   [junit4]   2>        at 
org.apache.lucene.mockfile.HandleLimitFS.onOpen(HandleLimitFS.java:48)
   [junit4]   2>        at 
org.apache.lucene.mockfile.HandleTrackingFS.callOpenHook(HandleTrackingFS.java:81)
   [junit4]   2>        at 
org.apache.lucene.mockfile.HandleTrackingFS.newOutputStream(HandleTrackingFS.java:160)
   [junit4]   2>        at 
org.apache.lucene.mockfile.FilterFileSystemProvider.newOutputStream(FilterFileSystemProvider.java:197)
   [junit4]   2>        at java.nio.file.Files.newOutputStream(Files.java:216)
   [junit4]   2>        at 
org.apache.lucene.store.FSDirectory$FSIndexOutput.<init>(FSDirectory.java:410)
   [junit4]   2>        at 
org.apache.lucene.store.FSDirectory$FSIndexOutput.<init>(FSDirectory.java:406)
   [junit4]   2>        at 
org.apache.lucene.store.FSDirectory.createOutput(FSDirectory.java:254)
   [junit4]   2>        at 
org.apache.lucene.store.MockDirectoryWrapper.createOutput(MockDirectoryWrapper.java:667)
   [junit4]   2>        at 
org.apache.lucene.store.LockValidatingDirectoryWrapper.createOutput(LockValidatingDirectoryWrapper.java:44)
   [junit4]   2>        at 
org.apache.lucene.store.TrackingDirectoryWrapper.createOutput(TrackingDirectoryWrapper.java:43)
   [junit4]   2>        at 
org.apache.lucene.codecs.compressing.CompressingStoredFieldsWriter.<init>(CompressingStoredFieldsWriter.java:115)
   [junit4]   2>        at 
org.apache.lucene.codecs.compressing.CompressingStoredFieldsFormat.fieldsWriter(CompressingStoredFieldsFormat.java:128)
   [junit4]   2>        at 
org.apache.lucene.codecs.lucene50.Lucene50StoredFieldsFormat.fieldsWriter(Lucene50StoredFieldsFormat.java:183)
   [junit4]   2>        at 
org.apache.lucene.codecs.asserting.AssertingStoredFieldsFormat.fieldsWriter(AssertingStoredFieldsFormat.java:48)
   [junit4]   2>        at 
org.apache.lucene.index.StoredFieldsConsumer.initStoredFieldsWriter(StoredFieldsConsumer.java:39)
   [junit4]   2>        at 
org.apache.lucene.index.StoredFieldsConsumer.startDocument(StoredFieldsConsumer.java:46)
   [junit4]   2>        at 
org.apache.lucene.index.DefaultIndexingChain.startStoredFields(DefaultIndexingChain.java:367)
   [junit4]   2>        at 
org.apache.lucene.index.DefaultIndexingChain.processDocument(DefaultIndexingChain.java:403)
   [junit4]   2>        at 
org.apache.lucene.index.DocumentsWriterPerThread.updateDocument(DocumentsWriterPerThread.java:250)
   [junit4]   2>        at 
org.apache.lucene.index.DocumentsWriter.updateDocument(DocumentsWriter.java:495)
   [junit4]   2>        at 
org.apache.lucene.index.IndexWriter.updateDocument(IndexWriter.java:1594)
   [junit4]   2>        at 
org.apache.lucene.index.IndexWriter.addDocument(IndexWriter.java:1213)
   [junit4]   2>        at 
org.apache.lucene.index.TestDemoParallelLeafReader$2.reindex(TestDemoParallelLeafReader.java:730)
   [junit4]   2>        at 
org.apache.lucene.index.TestDemoParallelLeafReader$ReindexingReader.getParallelLeafReader(TestDemoParallelLeafReader.java:405)
   [junit4]   2>        at 
org.apache.lucene.index.TestDemoParallelLeafReader$ReindexingReader.getCurrentReader(TestDemoParallelLeafReader.java:163)
   [junit4]   2>        at 
org.apache.lucene.index.TestDemoParallelLeafReader$ReindexingReader$ReindexingMergePolicy$ReindexingOneMerge.wrapForMerge(TestDemoParallelLeafReader.java:533)
   [junit4]   2>        at 
org.apache.lucene.index.IndexWriter.mergeMiddle(IndexWriter.java:4417)
   [junit4]   2>        at 
org.apache.lucene.index.IndexWriter.merge(IndexWriter.java:4057)
   [junit4]   2>        at 
org.apache.lucene.index.ConcurrentMergeScheduler.doMerge(ConcurrentMergeScheduler.java:625)
   [junit4]   2>        at 
org.apache.lucene.index.ConcurrentMergeScheduler$MergeThread.run(ConcurrentMergeScheduler.java:662)
   [junit4]   2> 
   [junit4]   2> ??? 16, 2019 1:22:39 ?? 
com.carrotsearch.randomizedtesting.RandomizedRunner$QueueUncaughtExceptionsHandler
 uncaughtException
   [junit4]   2> ??: Uncaught exception in thread: Thread[Lucene Merge Thread 
#71,5,TGRP-TestDemoParallelLeafReader]
   [junit4]   2> org.apache.lucene.index.MergePolicy$MergeException: 
java.nio.file.FileSystemException: 
/home/jenkins/jenkins-slave/workspace/Lucene-Solr-NightlyTests-8.x/checkout/lucene/build/core/test/J2/temp/lucene.index.TestDemoParallelLeafReader_D1AD2D71F762344B-001/tempDir-002/segs/4co6e0ws25r8xxi24lsus85ca_122/_1_Lucene80_0.dvm:
 Too many open files
   [junit4]   2>        at 
__randomizedtesting.SeedInfo.seed([D1AD2D71F762344B]:0)
   [junit4]   2>        at 
org.apache.lucene.index.ConcurrentMergeScheduler.handleMergeException(ConcurrentMergeScheduler.java:704)
   [junit4]   2>        at 
org.apache.lucene.index.ConcurrentMergeScheduler$MergeThread.run(ConcurrentMergeScheduler.java:684)
   [junit4]   2> Caused by: java.nio.file.FileSystemException: 
/home/jenkins/jenkins-slave/workspace/Lucene-Solr-NightlyTests-8.x/checkout/lucene/build/core/test/J2/temp/lucene.index.TestDemoParallelLeafReader_D1AD2D71F762344B-001/tempDir-002/segs/4co6e0ws25r8xxi24lsus85ca_122/_1_Lucene80_0.dvm:
 Too many open files
   [junit4]   2>        at 
org.apache.lucene.mockfile.HandleLimitFS.onOpen(HandleLimitFS.java:48)
   [junit4]   2>        at 
org.apache.lucene.mockfile.HandleTrackingFS.callOpenHook(HandleTrackingFS.java:81)
   [junit4]   2>        at 
org.apache.lucene.mockfile.HandleTrackingFS.newOutputStream(HandleTrackingFS.java:160)
   [junit4]   2>        at 
org.apache.lucene.mockfile.FilterFileSystemProvider.newOutputStream(FilterFileSystemProvider.java:197)
   [junit4]   2>        at java.nio.file.Files.newOutputStream(Files.java:216)
   [junit4]   2>        at 
org.apache.lucene.store.FSDirectory$FSIndexOutput.<init>(FSDirectory.java:410)
   [junit4]   2>        at 
org.apache.lucene.store.FSDirectory$FSIndexOutput.<init>(FSDirectory.java:406)
   [junit4]   2>        at 
org.apache.lucene.store.FSDirectory.createOutput(FSDirectory.java:254)
   [junit4]   2>        at 
org.apache.lucene.store.NRTCachingDirectory.createOutput(NRTCachingDirectory.java:146)
   [junit4]   2>        at 
org.apache.lucene.store.MockDirectoryWrapper.createOutput(MockDirectoryWrapper.java:667)
   [junit4]   2>        at 
org.apache.lucene.store.LockValidatingDirectoryWrapper.createOutput(LockValidatingDirectoryWrapper.java:44)
   [junit4]   2>        at 
org.apache.lucene.store.TrackingDirectoryWrapper.createOutput(TrackingDirectoryWrapper.java:43)
   [junit4]   2>        at 
org.apache.lucene.codecs.lucene80.Lucene80DocValuesConsumer.<init>(Lucene80DocValuesConsumer.java:73)
   [junit4]   2>        at 
org.apache.lucene.codecs.lucene80.Lucene80DocValuesFormat.fieldsConsumer(Lucene80DocValuesFormat.java:141)
   [junit4]   2>        at 
org.apache.lucene.codecs.perfield.PerFieldDocValuesFormat$FieldsWriter.getInstance(PerFieldDocValuesFormat.java:224)
   [junit4]   2>        at 
org.apache.lucene.codecs.perfield.PerFieldDocValuesFormat$FieldsWriter.merge(PerFieldDocValuesFormat.java:139)
   [junit4]   2>        at 
org.apache.lucene.index.SegmentMerger.mergeDocValues(SegmentMerger.java:196)
   [junit4]   2>        at 
org.apache.lucene.index.SegmentMerger.merge(SegmentMerger.java:151)
   [junit4]   2>        at 
org.apache.lucene.index.IndexWriter.mergeMiddle(IndexWriter.java:4463)
   [junit4]   2>        at 
org.apache.lucene.index.IndexWriter.merge(IndexWriter.jav

[...truncated too long message...]

cValuesFormat.java:224)
   [junit4]    >        at 
org.apache.lucene.codecs.perfield.PerFieldDocValuesFormat$FieldsWriter.merge(PerFieldDocValuesFormat.java:139)
   [junit4]    >        at 
org.apache.lucene.index.SegmentMerger.mergeDocValues(SegmentMerger.java:196)
   [junit4]    >        at 
org.apache.lucene.index.SegmentMerger.merge(SegmentMerger.java:151)
   [junit4]    >        at 
org.apache.lucene.index.IndexWriter.mergeMiddle(IndexWriter.java:4463)
   [junit4]    >        ... 3 moreThrowable #24: 
com.carrotsearch.randomizedtesting.UncaughtExceptionError: Captured an uncaught 
exception in thread: Thread[id=19536, name=Lucene Merge Thread #67, 
state=RUNNABLE, group=TGRP-TestDemoParallelLeafReader]
   [junit4]    > Caused by: org.apache.lucene.index.MergePolicy$MergeException: 
java.nio.file.FileSystemException: 
/home/jenkins/jenkins-slave/workspace/Lucene-Solr-NightlyTests-8.x/checkout/lucene/build/core/test/J2/temp/lucene.index.TestDemoParallelLeafReader_D1AD2D71F762344B-001/tempDir-002/segs/4co6e0ws25r8xxi24lsus855a_122/_0_Direct_0.dvdm:
 Too many open files
   [junit4]    >        at 
__randomizedtesting.SeedInfo.seed([D1AD2D71F762344B]:0)
   [junit4]    >        at 
org.apache.lucene.index.ConcurrentMergeScheduler.handleMergeException(ConcurrentMergeScheduler.java:704)
   [junit4]    >        at 
org.apache.lucene.index.ConcurrentMergeScheduler$MergeThread.run(ConcurrentMergeScheduler.java:684)
   [junit4]    > Caused by: java.nio.file.FileSystemException: 
/home/jenkins/jenkins-slave/workspace/Lucene-Solr-NightlyTests-8.x/checkout/lucene/build/core/test/J2/temp/lucene.index.TestDemoParallelLeafReader_D1AD2D71F762344B-001/tempDir-002/segs/4co6e0ws25r8xxi24lsus855a_122/_0_Direct_0.dvdm:
 Too many open files
   [junit4]    >        at 
org.apache.lucene.mockfile.HandleLimitFS.onOpen(HandleLimitFS.java:48)
   [junit4]    >        at 
org.apache.lucene.mockfile.HandleTrackingFS.callOpenHook(HandleTrackingFS.java:81)
   [junit4]    >        at 
org.apache.lucene.mockfile.HandleTrackingFS.newOutputStream(HandleTrackingFS.java:160)
   [junit4]    >        at 
org.apache.lucene.mockfile.FilterFileSystemProvider.newOutputStream(FilterFileSystemProvider.java:197)
   [junit4]    >        at java.nio.file.Files.newOutputStream(Files.java:216)
   [junit4]    >        at 
org.apache.lucene.store.FSDirectory$FSIndexOutput.<init>(FSDirectory.java:410)
   [junit4]    >        at 
org.apache.lucene.store.FSDirectory$FSIndexOutput.<init>(FSDirectory.java:406)
   [junit4]    >        at 
org.apache.lucene.store.FSDirectory.createOutput(FSDirectory.java:254)
   [junit4]    >        at 
org.apache.lucene.store.MockDirectoryWrapper.createOutput(MockDirectoryWrapper.java:667)
   [junit4]    >        at 
org.apache.lucene.store.LockValidatingDirectoryWrapper.createOutput(LockValidatingDirectoryWrapper.java:44)
   [junit4]    >        at 
org.apache.lucene.store.TrackingDirectoryWrapper.createOutput(TrackingDirectoryWrapper.java:43)
   [junit4]    >        at 
org.apache.lucene.codecs.memory.DirectDocValuesConsumer.<init>(DirectDocValuesConsumer.java:58)
   [junit4]    >        at 
org.apache.lucene.codecs.memory.DirectDocValuesFormat.fieldsConsumer(DirectDocValuesFormat.java:71)
   [junit4]    >        at 
org.apache.lucene.codecs.perfield.PerFieldDocValuesFormat$FieldsWriter.getInstance(PerFieldDocValuesFormat.java:224)
   [junit4]    >        at 
org.apache.lucene.codecs.perfield.PerFieldDocValuesFormat$FieldsWriter.getInstance(PerFieldDocValuesFormat.java:160)
   [junit4]    >        at 
org.apache.lucene.codecs.perfield.PerFieldDocValuesFormat$FieldsWriter.addNumericField(PerFieldDocValuesFormat.java:109)
   [junit4]    >        at 
org.apache.lucene.index.NumericDocValuesWriter.flush(NumericDocValuesWriter.java:122)
   [junit4]    >        at 
org.apache.lucene.index.DefaultIndexingChain.writeDocValues(DefaultIndexingChain.java:263)
   [junit4]    >        at 
org.apache.lucene.index.DefaultIndexingChain.flush(DefaultIndexingChain.java:138)
   [junit4]    >        at 
org.apache.lucene.index.DocumentsWriterPerThread.flush(DocumentsWriterPerThread.java:468)
   [junit4]    >        at 
org.apache.lucene.index.DocumentsWriter.doFlush(DocumentsWriter.java:555)
   [junit4]    >        at 
org.apache.lucene.index.DocumentsWriter.flushAllThreads(DocumentsWriter.java:722)
   [junit4]    >        at 
org.apache.lucene.index.IndexWriter.doFlush(IndexWriter.java:3591)
   [junit4]    >        at 
org.apache.lucene.index.IndexWriter.flush(IndexWriter.java:3566)
   [junit4]    >        at 
org.apache.lucene.index.IndexWriter.forceMerge(IndexWriter.java:1960)
   [junit4]    >        at 
org.apache.lucene.index.IndexWriter.forceMerge(IndexWriter.java:1940)
   [junit4]    >        at 
org.apache.lucene.index.TestDemoParallelLeafReader$2.reindex(TestDemoParallelLeafReader.java:746)
   [junit4]    >        at 
org.apache.lucene.index.TestDemoParallelLeafReader$ReindexingReader.getParallelLeafReader(TestDemoParallelLeafReader.java:405)
   [junit4]    >        at 
org.apache.lucene.index.TestDemoParallelLeafReader$ReindexingReader.getCurrentReader(TestDemoParallelLeafReader.java:163)
   [junit4]    >        at 
org.apache.lucene.index.TestDemoParallelLeafReader$ReindexingReader$ReindexingMergePolicy$ReindexingOneMerge.wrapForMerge(TestDemoParallelLeafReader.java:533)
   [junit4]    >        at 
org.apache.lucene.index.IndexWriter.mergeMiddle(IndexWriter.java:4417)
   [junit4]    >        at 
org.apache.lucene.index.IndexWriter.merge(IndexWriter.java:4057)
   [junit4]    >        at 
org.apache.lucene.index.ConcurrentMergeScheduler.doMerge(ConcurrentMergeScheduler.java:625)
   [junit4]    >        at 
org.apache.lucene.index.ConcurrentMergeScheduler$MergeThread.run(ConcurrentMergeScheduler.java:662)
   [junit4]   2> NOTE: leaving temporary files on disk at: 
/home/jenkins/jenkins-slave/workspace/Lucene-Solr-NightlyTests-8.x/checkout/lucene/build/core/test/J2/temp/lucene.index.TestDemoParallelLeafReader_D1AD2D71F762344B-001
   [junit4]   2> NOTE: test params are: codec=Asserting(Lucene84): 
{text=PostingsFormat(name=LuceneVarGapDocFreqInterval), id=Lucene84}, 
docValues:{number_56=DocValuesFormat(name=Lucene80), 
number_119=DocValuesFormat(name=Direct), 
number_33=DocValuesFormat(name=Lucene80), 
number_118=DocValuesFormat(name=Lucene80), 
number_31=DocValuesFormat(name=Asserting), 
number_50=DocValuesFormat(name=Direct), number_94=DocValuesFormat(name=Direct), 
number_9=DocValuesFormat(name=Direct), number_8=DocValuesFormat(name=Lucene80), 
number_15=DocValuesFormat(name=Lucene80), 
number_37=DocValuesFormat(name=Lucene80), 
number_36=DocValuesFormat(name=Direct), 
number_13=DocValuesFormat(name=Asserting), 
number=DocValuesFormat(name=Lucene80), number_122=DocValuesFormat(name=Direct), 
number_121=DocValuesFormat(name=Lucene80), 
number_120=DocValuesFormat(name=Lucene80), text=DocValuesFormat(name=Direct), 
id=DocValuesFormat(name=Lucene80), number_21=DocValuesFormat(name=Direct), 
number_42=DocValuesFormat(name=Asserting), 
number_29=DocValuesFormat(name=Direct), 
number_27=DocValuesFormat(name=Lucene80), 
number_46=DocValuesFormat(name=Asserting), 
number_3=DocValuesFormat(name=Lucene80), 
number_2=DocValuesFormat(name=Asserting), 
number_1=DocValuesFormat(name=Direct), 
number_0=DocValuesFormat(name=Lucene80)}, maxPointsInLeafNode=1612, 
maxMBSortInHeap=7.583878764501662, 
sim=Asserting(org.apache.lucene.search.similarities.AssertingSimilarity@d6e79d9),
 locale=zh-TW, timezone=America/Indiana/Knox
   [junit4]   2> NOTE: Linux 4.15.0-54-generic amd64/Oracle Corporation 
1.8.0_191 (64-bit)/cpus=4,threads=1,free=111936920,total=409468928
   [junit4]   2> NOTE: All tests run in this JVM: [TestIndexingSequenceNumbers, 
TestExternalCodecs, TestBooleanQuery, TestSubScorerFreqs, 
TestFieldUpdatesBuffer, TestTwoPhaseCommitTool, Test2BTerms, TestFieldInfos, 
TestDisjunctionMaxQuery, Test2BPostingsBytes, TestBytesRefAttImpl, 
TestFloatRangeFieldQueries, TestBoolean2ScorerSupplier, TestParallelLeafReader, 
TestCharsRefBuilder, TestReaderWrapperDVTypeCheck, TestLongPostings, 
TestPrefixInBooleanQuery, TestGeoUtils, TestOmitNorms, TestCustomTermFreq, 
TestNoMergeScheduler, TestPackedInts, TestBlendedTermQuery, TestBinaryDocument, 
TestToken, TestIsCurrent, TestSPIClassIterator, TestIndexTooManyDocs, 
TestLongRangeFieldQueries, TestSpanFirstQuery, TestCharacterUtils, 
TestDirectory, TestPerFieldDocValuesFormat, TestScoreCachingWrappingScorer, 
Test2BBKDPoints, TestPendingSoftDeletes, TestLatLonDocValuesQueries, 
TestStressNRT, TestLucene50TermVectorsFormat, TestBufferedChecksum, 
TestDocsAndPositions, TestTopDocsCollector, TestMultiLevelSkipList, 
TestOperations, TestFieldCacheRewriteMethod, TestHighCompressionMode, 
TestFutureArrays, TestSloppyMath, TestByteSlices, TestNot, 
TestIndexWriterOutOfFileDescriptors, TestGraphTokenizers, 
TestRecyclingIntBlockAllocator, Test2BPagedBytes, TestMathUtil, 
TestGrowableByteArrayDataOutput, TestUsageTrackingFilterCachingPolicy, 
TestSpanNotQuery, TestBKDRadixSort, TestBasicModelIne, 
TestMultiTermQueryRewrites, TestFixedBitSet, TestNRTCachingDirectory, 
TestFstDirectAddressing, TestAllFilesHaveCodecHeader, TestFeatureSort, 
TestSimpleSearchEquivalence, TestCompiledAutomaton, TestVersion, 
TestNRTReaderWithThreads, TestSparseFixedBitSet, TestIndexWriterConfig, 
TestRadixSelector, TestDoubleValuesSource, TestConjunctions, 
TestApproximationSearchEquivalence, TestIndexWriterExceptions, 
TestThreadedForceMerge, TestLMJelinekMercerSimilarity, TestDistributionLL, 
TestMixedDocValuesUpdates, TestDeterminizeLexicon, TestFloatRange, 
TestBasicModelG, TestIndexWriterFromReader, TestLucene80NormsFormat, 
TestLucene80NormsFormatMergeInstance, TestForDeltaUtil, TestForUtil, 
TestDateTools, TestDocument, TestDoubleRange, TestIntRange, 
TestLatLonDocValuesField, TestLatLonPoint, TestLatLonPointDistanceFeatureQuery, 
TestLatLonPointDistanceSort, TestLongDistanceFeatureQuery, TestPolygon, 
TestPolygon2D, Test2BBinaryDocValues, Test2BDocs, Test2BNumericDocValues, 
Test2BPoints, Test4GBStoredFields, TestCheckIndex, TestCodecHoldsOpenFiles, 
TestCodecs, TestConcurrentMergeScheduler, TestConsistentFieldNumbers, 
TestCrash, TestDeletionPolicy, TestDemoParallelLeafReader]
   [junit4] Completed [325/528 (1!)] on J2 in 113.76s, 5 tests, 1 error <<< 
FAILURES!

[...truncated 68094 lines...]
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