Blocker 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.