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https://issues.apache.org/jira/browse/LUCENE-4238?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13418644#comment-13418644
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Mark Miller commented on LUCENE-4238:
-------------------------------------
Not sure the exact details yet, but it appears files can show up in the
delegate and the cache, and the code considers this a problem. I've seen:
{noformat}
java.io.IOException: cannot uncache file="t1509": it was separately also
created in the delegate directory
at
__randomizedtesting.SeedInfo.seed([6917E11030521BB4:9721BE7090E1E8BC]:0)
at
org.apache.lucene.store.NRTCachingDirectory.unCache(NRTCachingDirectory.java:289)
at
org.apache.lucene.store.NRTCachingDirectory.close(NRTCachingDirectory.java:261)
{noformat}
and
{noformat}
125733 T925 ccr.RunnerThreadGroup.uncaughtException WARNING RunnerThreadGroup's
sub thread threw an uncaught exception.
org.apache.lucene.index.MergePolicy$MergeException: java.lang.AssertionError:
name=_yd_Lucene40WithOrds_0.tii
at
org.apache.lucene.index.ConcurrentMergeScheduler.handleMergeException(ConcurrentMergeScheduler.java:507)
at
org.apache.lucene.index.ConcurrentMergeScheduler$MergeThread.run(ConcurrentMergeScheduler.java:480)
Caused by: java.lang.AssertionError: name=_yd_Lucene40WithOrds_0.tii
at
org.apache.lucene.store.NRTCachingDirectory.deleteFile(NRTCachingDirectory.java:165)
at
org.apache.lucene.index.IndexFileDeleter.deleteFile(IndexFileDeleter.java:568)
at
org.apache.lucene.index.IndexFileDeleter.decRef(IndexFileDeleter.java:507)
at
org.apache.lucene.index.IndexFileDeleter.decRef(IndexFileDeleter.java:492)
{noformat}
When I saw the second, it may be unrelated, but I also saw:
{noformat}
125492 T923 C6 P47307 oasc.SolrException.log SEVERE java.lang.AssertionError:
recoveryExecutor-31-thread-1: RefCount is 0 pre-decrement for file "_y8.fdt"
at
org.apache.lucene.index.IndexFileDeleter$RefCount.DecRef(IndexFileDeleter.java:614)
at
org.apache.lucene.index.IndexFileDeleter.decRef(IndexFileDeleter.java:504)
at
org.apache.lucene.index.IndexFileDeleter.decRef(IndexFileDeleter.java:492)
at
org.apache.lucene.index.IndexFileDeleter.checkpoint(IndexFileDeleter.java:453)rellim
at
org.apache.lucene.index.IndexWriter.checkpoint(IndexWriter.java:2000)
at
org.apache.lucene.index.IndexWriter.publishFlushedSegment(IndexWriter.java:2123)
{noformat}
> NRTCachingDirectory has concurrency bug(s).
> -------------------------------------------
>
> Key: LUCENE-4238
> URL: https://issues.apache.org/jira/browse/LUCENE-4238
> Project: Lucene - Java
> Issue Type: Bug
> Components: core/store
> Reporter: Mark Miller
> Fix For: 4.0, 5.0
>
>
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