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From "Michael McCandless (JIRA)" <j...@apache.org>
Subject [jira] Updated: (LUCENE-1992) intermittent failure in TestIndexWriter. testExceptionDuringSync
Date Sun, 18 Oct 2009 23:41:31 GMT

     [ https://issues.apache.org/jira/browse/LUCENE-1992?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Michael McCandless updated LUCENE-1992:
---------------------------------------

    Attachment: LUCENE-1992.patch

Patch attached.  I'll commit shortly on trunk & 2.9.1.

There is a thread hazard that happens when a merge is committing just
as an exception is happening during sync.  There merge actually
changes the segmentInfos, but fails to checkpoint before exiting the
sync block.  If an exception during syncing is handled in another
thread, this can then decRef the newly merged segment to 0, deleting
it too early.

> intermittent failure in TestIndexWriter. testExceptionDuringSync 
> -----------------------------------------------------------------
>
>                 Key: LUCENE-1992
>                 URL: https://issues.apache.org/jira/browse/LUCENE-1992
>             Project: Lucene - Java
>          Issue Type: Bug
>          Components: Index
>            Reporter: Michael McCandless
>            Assignee: Michael McCandless
>            Priority: Minor
>             Fix For: 3.0
>
>         Attachments: LUCENE-1992.patch
>
>
> {code}
> common.test:
>     [mkdir] Created dir: C:\Projects\lucene\trunk-full1\build\test
>     [junit] Testsuite: org.apache.lucene.index.TestIndexWriter
>     [junit] Tests run: 102, Failures: 0, Errors: 1, Time elapsed: 100,297sec
>     [junit]
>     [junit] Testcase: testExceptionDuringSync(org.apache.lucene.index.TestIndexWriter):
Caused an ERROR
>     [junit] _a.fnm
>     [junit] java.io.FileNotFoundException: _a.fnm
>     [junit]     at org.apache.lucene.store.MockRAMDirectory.openInput(MockRAMDirectory.java:226)
>     [junit]     at org.apache.lucene.index.FieldInfos.<init>(FieldInfos.java:68)
>     [junit]     at org.apache.lucene.index.SegmentReader$CoreReaders.<init>(SegmentReader.java:116)
>     [junit]     at org.apache.lucene.index.SegmentReader.get(SegmentReader.java:620)
>     [junit]     at org.apache.lucene.index.SegmentReader.get(SegmentReader.java:590)
>     [junit]     at org.apache.lucene.index.DirectoryReader.<init>(DirectoryReader.java:104)
>     [junit]     at org.apache.lucene.index.ReadOnlyDirectoryReader.<init>(ReadOnlyDirectoryReader.java:27)
>     [junit]     at org.apache.lucene.index.DirectoryReader$1.doBody(DirectoryReader.java:74)
>     [junit]     at org.apache.lucene.index.SegmentInfos$FindSegmentsFile.run(SegmentInfos.java:704)
>     [junit]     at org.apache.lucene.index.DirectoryReader.open(DirectoryReader.java:69)
>     [junit]     at org.apache.lucene.index.IndexReader.open(IndexReader.java:307)
>     [junit]     at org.apache.lucene.index.IndexReader.open(IndexReader.java:193)
>     [junit]     at org.apache.lucene.index.TestIndexWriter.testExceptionDuringSync(TestIndexWriter.java:2723)
>     [junit]     at org.apache.lucene.util.LuceneTestCase.runBare(LuceneTestCase.java:206)
>     [junit]
>     [junit]
>     [junit] Test org.apache.lucene.index.TestIndexWriter FAILED
> {code}

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