[LUCENE-6205] DV updates can hit FileNotFoundException due to concurrency bug

• Type: Bug
• Status: Closed
• Priority: Blocker
• Resolution: Fixed
• Fix Version/s: 4.10.4, 5.0, 5.1, 6.0
• Lucene Fields: New
• Assignee: Michael McCandless
• Reporter: Michael McCandless
• Created: 28/Jan/15 17:39
• Updated: 28/Aug/22 14:24
• Resolved: 25/Feb/15 08:58

Description

Jenkins has hit this a few times recently, e.g.:

 [junit4] Suite: org.apache.lucene.index.TestBinaryDocValuesUpdates
   [junit4]   2> Jan 28, 2015 11:49:24 AM com.carrotsearch.randomizedtesting.RandomizedRunner$QueueUncaughtExceptionsHandler uncaughtException
   [junit4]   2> WARNUNG: Uncaught exception in thread: Thread[Lucene Merge Thread #1,5,TGRP-TestBinaryDocValuesUpdates]
   [junit4]   2> org.apache.lucene.index.MergePolicy$MergeException: java.nio.file.NoSuchFileException: _4_1.fnm in dir=RAMDirectory@5dcf7f8a lockFactory=org.apache.lucene.store.SingleInstanceLockFactory@ccb4148
   [junit4]   2> 	at __randomizedtesting.SeedInfo.seed([5EC20FA2CD1E68B8]:0)
   [junit4]   2> 	at org.apache.lucene.index.ConcurrentMergeScheduler.handleMergeException(ConcurrentMergeScheduler.java:641)
   [junit4]   2> 	at org.apache.lucene.index.ConcurrentMergeScheduler$MergeThread.run(ConcurrentMergeScheduler.java:609)
   [junit4]   2> Caused by: java.nio.file.NoSuchFileException: _4_1.fnm in dir=RAMDirectory@5dcf7f8a lockFactory=org.apache.lucene.store.SingleInstanceLockFactory@ccb4148
   [junit4]   2> 	at org.apache.lucene.store.MockDirectoryWrapper.openInput(MockDirectoryWrapper.java:655)
   [junit4]   2> 	at org.apache.lucene.store.Directory.openChecksumInput(Directory.java:110)
   [junit4]   2> 	at org.apache.lucene.codecs.lucene50.Lucene50FieldInfosFormat.read(Lucene50FieldInfosFormat.java:113)
   [junit4]   2> 	at org.apache.lucene.index.SegmentReader.initFieldInfos(SegmentReader.java:155)
   [junit4]   2> 	at org.apache.lucene.index.SegmentReader.<init>(SegmentReader.java:119)
   [junit4]   2> 	at org.apache.lucene.index.IndexWriter.mergeMiddle(IndexWriter.java:3935)
   [junit4]   2> 	at org.apache.lucene.index.IndexWriter.merge(IndexWriter.java:3559)
   [junit4]   2> 	at org.apache.lucene.index.ConcurrentMergeScheduler.doMerge(ConcurrentMergeScheduler.java:549)
   [junit4]   2> 	at org.apache.lucene.index.ConcurrentMergeScheduler$MergeThread.run(ConcurrentMergeScheduler.java:587)
   [junit4]   2> 
   [junit4]   2> NOTE: reproduce with: ant test  -Dtestcase=TestBinaryDocValuesUpdates -Dtests.method=testManyReopensAndFields -Dtests.seed=5EC20FA2CD1E68B8 -Dtests.slow=true -Dtests.locale=de_DE -Dtests.timezone=Europe/Samara -Dtests.asserts=true -Dtests.file.encoding=UTF-8

It repros only after substantial beasting.

It's a concurrency issue between one thread kicking off a merge, and another thread resolving doc values updates.