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https://issues.apache.org/jira/browse/LUCENE-4238?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13419576#comment-13419576
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Robert Muir commented on LUCENE-4238:
-------------------------------------
Specifically this line would cause the problem:
{noformat}
final Directory dir = new NRTCachingDirectory(newFSDirectory(new
File(TEST_DIRECTORY)), 0.5, 1);//newDirectory();
{noformat}
TEST_DIRECTORY is set by default to "random", so it would be reused across test
runs.
I changed it to use:
{noformat}
File tmpdir = _TestUtil.getTempDir("threadSafety");
tmpdir.mkdirs();
{noformat}
It always passes for me.
However, if your version produces same fail you are seeing, this would be
consistent with my previous
comments about what happens if you modify files directly on the filesystem
underneath NRTCachingDir (e.g. replication handler),
because thats essentially what that test bug would cause.
> 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
>
> Attachments: LUCENE-4238.patch, LUCENE-4238_test.patch
>
>
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