zhihai xu created HIVE-16433:
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Summary: 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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