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https://issues.apache.org/jira/browse/HIVE-9120?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14250128#comment-14250128
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Brock Noland commented on HIVE-9120:
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+1, thank you [~dongc]!
> Hive Query log does not work when hive.exec.parallel is true
> ------------------------------------------------------------
>
> Key: HIVE-9120
> URL: https://issues.apache.org/jira/browse/HIVE-9120
> Project: Hive
> Issue Type: Bug
> Components: HiveServer2, Logging
> Reporter: Dong Chen
> Assignee: Dong Chen
> Attachments: HIVE-9120.patch
>
>
> When hive.exec.parallel is true, the query log is not saved and Beeline can
> not retrieve it.
> When parallel, Driver.launchTask() may run the task in a new thread if other
> conditions are also on. TaskRunner.start() is invoked instead of
> TaskRunner.runSequential(). This cause the threadlocal variable OperationLog
> to be null and query logs are not logged.
> The OperationLog object should be set in the new thread in this case.
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