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https://issues.apache.org/jira/browse/LUCENE-2637?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12907429#action_12907429
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Yonik Seeley commented on LUCENE-2637:
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+1, looks good!
> FSDirectory.copyBytes isn't safe for SimpleFSDirectory
> ------------------------------------------------------
>
> Key: LUCENE-2637
> URL: https://issues.apache.org/jira/browse/LUCENE-2637
> Project: Lucene - Java
> Issue Type: Bug
> Components: Tests
> Affects Versions: 3.1, 4.0
> Reporter: Robert Muir
> Attachments: LUCENE-2637.patch, LUCENE-2637.patch
>
>
> the copyBytes optimization from LUCENE-2574 is not safe for
> SimpleFSDirectory, but works fine for NIOFSDirectory.
> With SimpleFSDirectory, the copyBytes optimization causes index corruption.
> see
> http://www.lucidimagination.com/search/document/36d2dbfc691909d5/bug_triggered_by_testindexwriter_testrandomstoredfields
> for background
> here are my steps to reproduce (most of the time, at least on windows):
> {noformat}
> 1. edit line 87 of TestIndexWriter to plugin the seed:
> random = newRandom(3312389322103990899L);
> 2. edit line 5138 of TestIndexWriter to force SimpleFSDirectory:
> Directory dir = new SimpleFSDirectory(index);
> 3. run this command:
> ant clean test-core -Dtestcase=TestIndexWriter
> -Dtestmethod=testRandomStoredFields -Dtests.iter=10
> -Dtests.codec="MockVariableIntBlock(29)"
> {noformat}
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