[jira] Updated: (LUCENE-2618) Intermittent failure in 3.x's backwards TestThreadedOptimize

["Michael McCandless (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/LUCENE-2618?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Michael McCandless updated LUCENE-2618:
---------------------------------------

    Attachment: LUCENE-2618.patch

Patch.

I think I found this -- it's a thread safety issue, that happens when a "normal" merge is kicking off at the same time that another thread calls optimize.

In this case it's possible that merge fails to mark itself as an optimizing merge, which means any merges that cascade from it will also fail to be optimized.

I also modified MockDirWrapper to randomly call Thread.yield to see if we can tease out any more thread bugs.

> Intermittent failure in 3.x's backwards TestThreadedOptimize
> ------------------------------------------------------------
>
>                 Key: LUCENE-2618
>                 URL: https://issues.apache.org/jira/browse/LUCENE-2618
>             Project: Lucene - Java
>          Issue Type: Bug
>          Components: Index
>            Reporter: Michael McCandless
>             Fix For: 3.1, 4.0
>
>         Attachments: LUCENE-2618.patch, LUCENE-2618.patch, LUCENE-2618.patch
>
>
> Failure looks like this:
> {noformat}
>     [junit] Testsuite: org.apache.lucene.index.TestThreadedOptimize
>     [junit] Testcase: testThreadedOptimize(org.apache.lucene.index.TestThreadedOptimize):	FAILED
>     [junit] null
>     [junit] junit.framework.AssertionFailedError: null
>     [junit] 	at org.apache.lucene.index.TestThreadedOptimize.runTest(TestThreadedOptimize.java:125)
>     [junit] 	at org.apache.lucene.index.TestThreadedOptimize.testThreadedOptimize(TestThreadedOptimize.java:149)
>     [junit] 	at org.apache.lucene.util.LuceneTestCase.runBare(LuceneTestCase.java:253)
> {noformat}
> I just committed some verbosity so next time it strikes we'll have more details.

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