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https://issues.apache.org/jira/browse/TAJO-869?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14058788#comment-14058788
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Hyunsik Choi commented on TAJO-869:
-----------------------------------
Actually, I also haven't found the exact cause of this failure.
The HashMap, you replaced by SortedMap, seems to be a potential failure cause.
Now, I tried to reproduce it, but I haven't.
Anyway, your fix looks reasonable.
Here is my +1 for the patch.
If we see the failure later, we can dig into it more at that time.
> Sometimes, the unit test of testTaskRunnerHistory is failed.
> ------------------------------------------------------------
>
> Key: TAJO-869
> URL: https://issues.apache.org/jira/browse/TAJO-869
> Project: Tajo
> Issue Type: Bug
> Affects Versions: 0.9.0
> Reporter: Hyunsik Choi
> Assignee: Jinho Kim
> Priority: Critical
> Fix For: 0.9.0
>
> Attachments: TAJO-869.patch
>
>
> {noformat}
> Results :
> Failed tests: testTaskRunnerHistory(org.apache.tajo.worker.TestHistory):
> expected:
> org.apache.tajo.worker.TaskRunnerHistory<org.apache.tajo.worker.TaskRunnerHistory@63bec4ad>
> but was:
> org.apache.tajo.worker.TaskRunnerHistory<org.apache.tajo.worker.TaskRunnerHistory@63bec4ad>
> {noformat}
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