romseygeek opened a new issue, #15580:
URL: https://github.com/apache/lucene/issues/15580
### Description
Too many open files exception from HandleLimitFS. The test combines data
from 15 indexes with concurrent merges running, and I guess this specific
combination of things tips it over the edge. The failure goes away with the
addition of `@HandleLimitFS.MaxOpenHandles(limit =
HandleLimitFS.MaxOpenHandles.MAX_OPEN_FILES * 2)`
```
java.nio.file.FileSystemException:
/Users/romseygeek/projects/lucene/lucene/core/build/tests-tmp/lucene.index.TestAddIndexes_1E5FC7CB8A9D1419-001/index-NIOFSDirectory-001/_d_Asserting_0.tip:
Too many open files
> at
__randomizedtesting.SeedInfo.seed([1E5FC7CB8A9D1419:3EF818C45EEF09A5]:0)
> at
org.apache.lucene.tests.mockfile.HandleLimitFS.onOpen(HandleLimitFS.java:67)
> at
org.apache.lucene.tests.mockfile.HandleTrackingFS.callOpenHook(HandleTrackingFS.java:82)
> at
org.apache.lucene.tests.mockfile.HandleTrackingFS.newFileChannel(HandleTrackingFS.java:202)
> at
org.apache.lucene.tests.mockfile.FilterFileSystemProvider.newFileChannel(FilterFileSystemProvider.java:206)
> at
java.base/java.nio.channels.FileChannel.open(FileChannel.java:301)
> at
java.base/java.nio.channels.FileChannel.open(FileChannel.java:353)
> at
org.apache.lucene.store.NIOFSDirectory.openInput(NIOFSDirectory.java:78)
> at
org.apache.lucene.tests.util.LuceneTestCase.slowFileExists(LuceneTestCase.java:3127)
> at
org.apache.lucene.tests.store.MockDirectoryWrapper.openInput(MockDirectoryWrapper.java:799)
> at
org.apache.lucene.codecs.lucene103.blocktree.Lucene103BlockTreeTermsReader.<init>(Lucene103BlockTreeTermsReader.java:127)
> at
org.apache.lucene.codecs.lucene104.Lucene104PostingsFormat.fieldsProducer(Lucene104PostingsFormat.java:425)
> at
org.apache.lucene.tests.codecs.asserting.AssertingPostingsFormat.fieldsProducer(AssertingPostingsFormat.java:54)
> at
org.apache.lucene.codecs.perfield.PerFieldPostingsFormat$FieldsReader.<init>(PerFieldPostingsFormat.java:315)
> at
org.apache.lucene.codecs.perfield.PerFieldPostingsFormat.fieldsProducer(PerFieldPostingsFormat.java:375)
> at
org.apache.lucene.index.SegmentCoreReaders.<init>(SegmentCoreReaders.java:98)
> at
org.apache.lucene.index.SegmentReader.<init>(SegmentReader.java:95)
> at
org.apache.lucene.index.StandardDirectoryReader.createOrReuseSegmentReader(StandardDirectoryReader.java:298)
> at
org.apache.lucene.index.StandardDirectoryReader.createSegmentReaders(StandardDirectoryReader.java:241)
> at
org.apache.lucene.index.StandardDirectoryReader$1.doBody(StandardDirectoryReader.java:96)
> at
org.apache.lucene.index.StandardDirectoryReader$1.doBody(StandardDirectoryReader.java:84)
> at
org.apache.lucene.index.SegmentInfos$FindSegmentsFile.run(SegmentInfos.java:828)
> at
org.apache.lucene.index.StandardDirectoryReader.open(StandardDirectoryReader.java:107)
> at
org.apache.lucene.index.StandardDirectoryReader.open(StandardDirectoryReader.java:73)
> at
org.apache.lucene.index.DirectoryReader.open(DirectoryReader.java:109)
> at
org.apache.lucene.index.DirectoryReader.open(DirectoryReader.java:61)
> at
org.apache.lucene.index.TestAddIndexes.testAddIndexesWithConcurrentMerges(TestAddIndexes.java:749)
``` g
### Gradle command to reproduce
```
gradlew :lucene:core:test --tests
"org.apache.lucene.index.TestAddIndexes.testAddIndexesWithConcurrentMerges"
-Ptests.asserts=true -Ptests.file.encoding=ISO-8859-1 -Ptests.gui=true
-Ptests.jvmargs= -Ptests.jvms=12 -Ptests.seed=1E5FC7CB8A9D1419
-Ptests.vectorsize=default
```
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