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https://issues.apache.org/jira/browse/HBASE-7172?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Enis Soztutar updated HBASE-7172:
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Status: Patch Available (was: Open)
> TestSplitLogManager.testVanishingTaskZNode() fails when run individually and
> is flaky
> -------------------------------------------------------------------------------------
>
> Key: HBASE-7172
> URL: https://issues.apache.org/jira/browse/HBASE-7172
> Project: HBase
> Issue Type: Bug
> Components: master
> Affects Versions: 0.96.0, 0.94.4
> Reporter: Enis Soztutar
> Assignee: Enis Soztutar
> Attachments: hbase-7172_v1.patch, hbase-7172_v2-0.94.patch,
> hbase-7172_v2.patch
>
>
> TestSplitLogManager.testVanishingTaskZNode fails when run individually (run
> just that test case from eclipse). I've also noticed that it is flaky on
> windows.
> The reason is a rare race condition, which somehow does not happen that much
> when the whole class is run.
> The sequence of events is smt like this:
> - we create 1 log file to split
> - we call splitLogDistributed() in its own thread.
> - splitLogDistributed() is waiting in waitForSplittingCompletion() since
> there are no splitlogworkers, it keep waiting.
> - we delete the task znode from zk
> - SplitLogManager receives the zk callback from GetDataAsyncCallback, which
> will call setDone() and mark the task as success.
> - However, meanwhile the waitForSplittingCompletion() loops sees that
> remainingInZK == 0, and calls return concurrently to the above.
> - on return from waitForSplittingCompletion(), splitLogDistributed() fails
> because the znode delete callback has not completed yet.
> This race only happens when the last task is deleted from zk, and normally
> only the SplitLogManager deletes the task znodes after processing it, so I
> don't think this is a production issue.
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