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Han-Wen NIenhuys commented on LUCENE-2585: ------------------------------------------ I've seen race condition diagnostics for Lucene code that could be related to this. Line numbers are for Lucene 5.5.2, but the problem seems present in master too. AFAICT: StandardDirectoryReader has an IndexWriter, and it checks things are up-to-date by checking if there are pending in-memory updates by looking at IndexWriter.SegmentInfos.version. That read is not synchronized relative to its write from IndexWriter.updateDocument WARNING: ThreadSanitizer: data race (pid=21636) Write of size 8 at 0x7f24ad9d3210 by thread T36 (mutexes: write M431922409782456832): #0 org.apache.lucene.index.SegmentInfos.changed()V (SegmentInfos.java:944) #1 org.apache.lucene.index.IndexWriter.newSegmentName()Ljava/lang/String; (IndexWriter.java:1652) #2 org.apache.lucene.index.DocumentsWriter.ensureInitialized(Lorg/apache/lucene/index/DocumentsWriterPerThreadPool$ThreadState;)V (DocumentsWriter.java:391) #3 org.apache.lucene.index.DocumentsWriter.updateDocument(Ljava/lang/Iterable;Lorg/apache/lucene/analysis/Analyzer;Lorg/apache/lucene/index/Term;)Z (DocumentsWriter.java:445) #4 org.apache.lucene.index.IndexWriter.updateDocument(Lorg/apache/lucene/index/Term;Ljava/lang/Iterable;)V (IndexWriter.java:1477) #5 com.google.gerrit.lucene.AutoCommitWriter.updateDocument(Lorg/apache/lucene/index/Term;Ljava/lang/Iterable;)V (AutoCommitWriter.java:100) #6 org.apache.lucene.index.TrackingIndexWriter.updateDocument(Lorg/apache/lucene/index/Term;Ljava/lang/Iterable;)J (TrackingIndexWriter.java:55) #7 com.google.gerrit.lucene.AbstractLuceneIndex$4.call()Ljava/lang/Long; (AbstractLuceneIndex.java:250) #8 com.google.gerrit.lucene.AbstractLuceneIndex$4.call()Ljava/lang/Object; (AbstractLuceneIndex.java:247) #9 com.google.common.util.concurrent.TrustedListenableFutureTask$TrustedFutureInterruptibleTask.runInterruptibly()V (TrustedListenableFutureTask.java:108) #10 com.google.common.util.concurrent.InterruptibleTask.run()V (InterruptibleTask.java:41) #11 com.google.common.util.concurrent.TrustedListenableFutureTask.run()V (TrustedListenableFutureTask.java:77) #12 java.util.concurrent.ThreadPoolExecutor.runWorker(Ljava/util/concurrent/ThreadPoolExecutor$Worker;)V (ThreadPoolExecutor.java:1142) #13 java.util.concurrent.ThreadPoolExecutor$Worker.run()V (ThreadPoolExecutor.java:617) #14 java.lang.Thread.run()V (Thread.java:745) #15 (Generated Stub) Previous read of size 8 at 0x7f24ad9d3210 by thread T29 (mutexes: write M1060737507754061632): #0 org.apache.lucene.index.IndexWriter.nrtIsCurrent(Lorg/apache/lucene/index/SegmentInfos;)Z (IndexWriter.java:4592) #1 org.apache.lucene.index.StandardDirectoryReader.doOpenFromWriter(Lorg/apache/lucene/index/IndexCommit;)Lorg/apache/lucene/index/DirectoryReader; (StandardDirectoryReader.java:282) #2 org.apache.lucene.index.StandardDirectoryReader.doOpenIfChanged(Lorg/apache/lucene/index/IndexCommit;)Lorg/apache/lucene/index/DirectoryReader; (StandardDirectoryReader.java:261) #3 org.apache.lucene.index.StandardDirectoryReader.doOpenIfChanged()Lorg/apache/lucene/index/DirectoryReader; (StandardDirectoryReader.java:251) #4 org.apache.lucene.index.DirectoryReader.openIfChanged(Lorg/apache/lucene/index/DirectoryReader;)Lorg/apache/lucene/index/DirectoryReader; (DirectoryReader.java:137) #5 com.google.gerrit.lucene.WrappableSearcherManager.refreshIfNeeded(Lorg/apache/lucene/search/IndexSearcher;)Lorg/apache/lucene/search/IndexSearcher; (WrappableSearcherManager.java:148) #6 com.google.gerrit.lucene.WrappableSearcherManager.refreshIfNeeded(Ljava/lang/Object;)Ljava/lang/Object; (WrappableSearcherManager.java:68) #7 org.apache.lucene.search.ReferenceManager.doMaybeRefresh()V (ReferenceManager.java:176) #8 org.apache.lucene.search.ReferenceManager.maybeRefreshBlocking()V (ReferenceManager.java:253) #9 org.apache.lucene.search.ControlledRealTimeReopenThread.run()V (ControlledRealTimeReopenThread.java:245) #10 (Generated Stub) > DirectoryReader.isCurrent might fail to see the segments file during > concurrent index changes > --------------------------------------------------------------------------------------------- > > Key: LUCENE-2585 > URL: https://issues.apache.org/jira/browse/LUCENE-2585 > Project: Lucene - Core > Issue Type: Bug > Components: core/index > Reporter: Sanne Grinovero > Fix For: 4.9, 6.0 > > > I could reproduce the issue several times but only by running long and > stressfull benchmarks, the high number of files is likely part of the > scenario. > All tests run on local disk, using ext3. > Sample stacktrace: > {noformat}java.io.FileNotFoundException: no segments* file found in > org.apache.lucene.store.NIOFSDirectory@/home/sanne/infinispan-41/lucene-directory/tempIndexName: > files: > _2l3.frq _uz.fdt _1q4.fnm _1q0.fdx _4bc.fdt _v2.tis _4ll.fdx _2l8.tii _ux.fnm > _3g7.fdx _4bb.tii _4bj.prx _uy.fdx _3g7.prx _2l7.frq _2la.fdt _3ge.nrm > _2l6.prx > _1py.fdx _3g6.nrm _v0.prx _4bi.tii _2l2.tis _v2.fdx _2l3.nrm _2l8.fnm > _4bg.tis _2la.tis _uu.fdx _3g6.fdx _1q3.frq _2la.frq _4bb.tis _3gb.tii > _1pz.tis > _2lb.nrm _4lm.nrm _3g9.tii _v0.fdt _2l5.fnm _v2.prx _4ll.tii _4bd.nrm > _2l7.fnm _2l4.nrm _1q2.tis _3gb.fdx _4bh.fdx _1pz.nrm _ux.fdx _ux.tii > _1q6.nrm > _3gf.fdx _4lk.fdt _3gd.nrm _v3.fnm _3g8.prx _1q2.nrm _4bh.prx _1q0.frq > _ux.fdt _1q7.fdt _4bb.fnm _4bf.nrm _4bc.nrm _3gb.fdt _4bh.fnm _2l5.tis > _1pz.fnm _1py.fnm _3gc.fnm _2l2.prx _2l4.frq _3gc.fdt _ux.tis _1q3.prx > _2l7.fdx _4bj.nrm _4bj.fdx _4bi.tis _3g9.prx _1q4.prx _v3.fdt _1q3.fdx > _2l9.fdt > _4bh.tis _3gb.nrm _v2.nrm _3gd.tii _2l7.nrm _2lb.tii _4lm.tis _3ga.fdx > _1pz.fdt _3g7.fnm _2l3.fnm _4lk.fnm _uz.fnm _2l2.frq _4bd.fdx _1q2.fdt > _3g7.tis > _4bi.frq _4bj.frq _2l7.prx _ux.prx _3gd.fnm _1q4.fdt _1q1.fdt _v1.fnm > _1py.nrm _3gf.nrm _4be.fdt _1q3.tii _1q1.prx _2l3.fdt _4lk.frq _2l4.fdx > _4bd.fnm > _uw.frq _3g8.fdx _2l6.tii _1q5.frq _1q5.tis _3g8.nrm _uw.nrm _v0.tii _v2.fdt > _2l7.fdt _v0.tis _uy.tii _3ge.tii _v1.tii _3gb.tis _4lm.fdx _4bc.fnm _2lb.frq > _2l6.fnm _3g6.tii _3ge.prx _uu.frq _1pz.fdx _1q2.fnm _4bi.prx _3gc.frq > _2l9.tis _3ge.fdt _uy.fdt _4ll.fnm _3gc.prx _1q7.tii _2l5.nrm _uy.nrm _uv.frq > _1q6.frq _4ba.tis _3g9.tis _4be.nrm _4bi.fnm _ux.frq _1q1.fnm _v0.fnm > _2l4.fnm _4ba.fnm _4be.tis _uz.prx _1q6.fdx _uw.tii _2l6.nrm _1pz.prx > _2l7.tis > _1q7.fdx _2l9.tii _4lk.tii _uz.frq _3g8.frq _4bb.prx _1q5.tii _1q5.prx > _v2.frq _4bc.tii _1q7.prx _v2.tii _2lb.tis _4bi.fdt _uv.nrm _2l2.fnm _4bd.tii > _1q7.tis > _4bg.fnm _3ga.frq _uu.fnm _2l9.fnm _3ga.fnm _uw.fnm _1pz.frq _1q1.fdx > _3ge.fdx _2l3.prx _3ga.nrm _uv.fdt _4bb.nrm _1q7.fnm _uv.tis _3gb.fnm > _2l6.tis _1pz.tii _uy.fnm _3gf.fdt _3gc.nrm _4bf.tis _1q5.fnm _uu.tis > _4bh.tii _2l5.fdt _1q6.tii _4bc.tis _3gc.tii _3g9.fnm _2l6.fdt _4bj.fnm > _uu.tii _v3.frq > _3g9.fdx _v0.nrm _2l7.tii _1q0.fdt _3ge.fnm _4bf.fdt _1q6.prx _uz.nrm > _4bi.fdx _3gf.fnm _4lm.frq _v0.fdx _4ba.fdt _1py.tii _4bf.tii _uw.fdx > _2l5.frq > _3g9.nrm _v1.fdt _uw.fdt _4bd.frq _4bg.prx _3gd.tis _1q4.tis _2l9.nrm > _2la.nrm _v3.tii _4bf.prx _1q1.nrm _4ba.tii _3gd.fdx _1q4.tii _4lm.tii > _3ga.tis > _4bf.fnm write.lock _2l8.prx _2l8.fdt segments.gen _2lb.fnm _2l4.fdt _1q2.prx > _4be.fnm _3gf.prx _2l6.fdx _3g6.fnm _4bb.fdt _4bd.tis _4lk.nrm _2l5.fdx > _2la.tii _4bd.prx _4ln.fnm _3gf.tis _4ba.nrm _v3.prx _uv.prx _1q3.fnm > _3ga.tii _uz.tii _3g9.frq _v0.frq _3ge.tis _3g6.tis _4ln.prx _3g7.tii > _3g8.fdt > _3g7.nrm _3ga.prx _2l2.fdx _2l8.fdx _4ba.prx _1py.frq _uz.fdx _2l3.tii > _3g6.prx _v3.fdx _1q6.fdt _v1.nrm _2l2.tii _1q0.tis _4ba.fdx _4be.tii > _4ba.frq > _4ll.fdt _4bh.nrm _4lm.fdt _1q7.frq _4lk.tis _4bc.frq _1q6.fnm _3g7.frq > _uw.tis _3g8.tis _2l9.fdx _2l4.tii _1q4.fdx _4be.prx _1q3.nrm _1q0.tii > _1q0.fnm > _v3.nrm _1py.tis _3g9.fdt _4bh.fdt _4ll.nrm _4lk.prx _3gd.prx _1q3.tis > _1q2.tii _2l2.nrm _3gd.fdt _2l3.fdx _3g6.fdt _3gd.frq _1q1.tis _4bb.fdx > _1q2.frq > _1q3.fdt _v1.tis _2l8.frq _3gc.fdx _1q1.frq _4bg.frq _4bb.frq _2la.fdx > _2l9.frq _uy.tis _uy.prx _4bg.fdx _3gb.prx _uy.frq _1q2.fdx _4lm.prx _2la.prx > _2l4.prx _4bg.fdt _4be.frq _1q7.nrm _2l5.prx _4bf.frq _v1.prx _4bd.fdt > _2l9.prx _1q6.tis _3g8.fnm _4ln.tis _2l3.tis _4bc.fdx _2lb.prx _3gb.frq > _3gf.frq > _2la.fnm _3ga.fdt _uz.tis _4bg.nrm _uv.tii _4bg.tii _3g8.tii _4ll.frq _uv.fnm > _2l8.tis _2l8.nrm _2l2.fdt _4bj.tis _4lk.fdx _uw.prx _4bc.prx _4bj.fdt > _4be.fdx > _1q4.frq _uu.fdt _1q1.tii _2l5.tii _2lb.fdt _4bh.frq _3ge.frq _1py.prx > _1q5.nrm _v1.fdx _3g7.fdt _4ln.fdt _1q4.nrm _1py.fdt _3gc.tis _4ll.prx > _v3.tis _4bf.fdx > _1q5.fdx _1q0.prx _4bi.nrm _4ll.tis _2l4.tis _3gf.tii _v2.fnm _uu.nrm > _1q0.nrm _4lm.fnm _uu.prx _2l6.frq _4ln.nrm _ux.nrm _3g6.frq _1q5.fdt > _4bj.tii > _2lb.fdx _uv.fdx _v1.frq > at > org.apache.lucene.index.SegmentInfos$FindSegmentsFile.run(SegmentInfos.java:634) > at > org.apache.lucene.index.SegmentInfos$FindSegmentsFile.run(SegmentInfos.java:517) > at org.apache.lucene.index.SegmentInfos.read(SegmentInfos.java:306) > at > org.apache.lucene.index.SegmentInfos.readCurrentVersion(SegmentInfos.java:408) > at > org.apache.lucene.index.DirectoryReader.isCurrent(DirectoryReader.java:797) > at > org.apache.lucene.index.DirectoryReader.doReopenNoWriter(DirectoryReader.java:407) > at > org.apache.lucene.index.DirectoryReader.doReopen(DirectoryReader.java:386) > at > org.apache.lucene.index.DirectoryReader.reopen(DirectoryReader.java:348) > at > org.infinispan.lucene.profiling.LuceneReaderThread.refreshIndexReader(LuceneReaderThread.java:79) > at > org.infinispan.lucene.profiling.LuceneReaderThread.testLoop(LuceneReaderThread.java:60) > at > org.infinispan.lucene.profiling.LuceneUserThread.run(LuceneUserThread.java:60) > at > java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886) > at > java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908) > at java.lang.Thread.run(Thread.java:619) > {noformat} -- This message was sent by Atlassian JIRA (v6.3.4#6332) --------------------------------------------------------------------- To unsubscribe, e-mail: dev-unsubscr...@lucene.apache.org For additional commands, e-mail: dev-h...@lucene.apache.org