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https://issues.apache.org/jira/browse/LUCENE-1638?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Michael McCandless resolved LUCENE-1638.
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Resolution: Fixed
> Thread safety issue can cause index corruption when autoCommit=true and
> multiple threads are committing
> -------------------------------------------------------------------------------------------------------
>
> Key: LUCENE-1638
> URL: https://issues.apache.org/jira/browse/LUCENE-1638
> Project: Lucene - Java
> Issue Type: Bug
> Components: Index
> Affects Versions: 2.9
> Reporter: Michael McCandless
> Assignee: Michael McCandless
> Fix For: 2.9
>
>
> This is only present in 2.9 trunk, but has been there since
> LUCENE-1516 was committed I believe.
> It's rare to hit: it only happens if multiple calls to commit() are in
> flight (from different threads) and where at least one of those calls
> is due to a merge calling commit (because autoCommit is true).
> When it strikes, it leaves the index corrupt because it incorrectly
> removes an active segment. It causes exceptions like this:
> {code}
> java.io.FileNotFoundException: _1e.fnm
> at
> org.apache.lucene.store.MockRAMDirectory.openInput(MockRAMDirectory.java:246)
> at org.apache.lucene.index.FieldInfos.<init>(FieldInfos.java:67)
> at
> org.apache.lucene.index.SegmentReader.initialize(SegmentReader.java:536)
> at org.apache.lucene.index.SegmentReader.get(SegmentReader.java:468)
> at org.apache.lucene.index.SegmentReader.get(SegmentReader.java:414)
> at
> org.apache.lucene.index.IndexWriter$ReaderPool.get(IndexWriter.java:641)
> at
> org.apache.lucene.index.IndexWriter$ReaderPool.get(IndexWriter.java:627)
> at
> org.apache.lucene.index.DocumentsWriter.applyDeletes(DocumentsWriter.java:923)
> at
> org.apache.lucene.index.IndexWriter.applyDeletes(IndexWriter.java:4987)
> at
> org.apache.lucene.index.IndexWriter.doFlushInternal(IndexWriter.java:4165)
> at org.apache.lucene.index.IndexWriter.doFlush(IndexWriter.java:4025)
> at org.apache.lucene.index.IndexWriter.flush(IndexWriter.java:4016)
> at
> org.apache.lucene.index.IndexWriter.closeInternal(IndexWriter.java:2077)
> at org.apache.lucene.index.IndexWriter.close(IndexWriter.java:2040)
> at org.apache.lucene.index.IndexWriter.close(IndexWriter.java:2004)
> at
> org.apache.lucene.index.TestStressIndexing2.indexRandom(TestStressIndexing2.java:210)
> at
> org.apache.lucene.index.TestStressIndexing2.testMultiConfig(TestStressIndexing2.java:104)
> {code}
> It's caused by failing to increment changeCount inside the same
> synchronized block where segmentInfos was changed, in commitMerge.
> The fix is simple -- I plan to commit shortly.
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