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https://issues.apache.org/jira/browse/HIVE-16433?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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zhihai xu reassigned HIVE-16433:
--------------------------------
> Not nullify rj to avoid NPE due to race condition in ExecDriver.
> ----------------------------------------------------------------
>
> Key: HIVE-16433
> URL: https://issues.apache.org/jira/browse/HIVE-16433
> Project: Hive
> Issue Type: Bug
> Reporter: zhihai xu
> Assignee: zhihai xu
> Priority: Minor
>
> Not nullify rj to avoid NPE due to race condition in ExecDriver. currently
> {{rj}} is set to null in ExecDriver.shutdown which is called from other
> thread for query cancellation. It can happen at any time. There is a
> potential race condition, the rj is still accessed after shutdown is called.
> For example: if the following is called right after ExecDriver.shutdown is
> called.
> {code}
> this.jobID = rj.getJobID();
> updateStatusInQueryDisplay();
> returnVal = jobExecHelper.progress(rj, jc, ctx);
> {code}
> Currently the purpose of nullifying rj is mainly to make sure
> {{rj.killJob()}} is only called once.
> I will add a flag jobKilled to make sure {{rj.killJob()}} will be only called
> once.
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