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https://issues.apache.org/jira/browse/IMPALA-7205?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16776605#comment-16776605
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ASF subversion and git services commented on IMPALA-7205:
---------------------------------------------------------
Commit e5a243e165baa92ae716f1535aaaf4fba5347aad in impala's branch
refs/heads/2.x from Dan Hecht
[ https://gitbox.apache.org/repos/asf?p=impala.git;h=e5a243e ]
IMPALA-7205: Respond to ReportExecStatus() RPC with CANCELLED if query
execution has terminated
Otherwise, if the coordinator to backend CancelFInstances() RPC had failed,
the query can hang (and/or finstances can continue running until the
query is closed.
Testing:
- the modified test reproduces the hang without the impalad fix
Change-Id: I7bb2c26edace89853f14a329f891d1f9a065a991
Reviewed-on: http://gerrit.cloudera.org:8080/10815
Reviewed-by: Impala Public Jenkins <[email protected]>
Tested-by: Impala Public Jenkins <[email protected]>
> Respond to ReportExecStatus() RPC with CANCELLED whenever query execution has
> terminated
> ----------------------------------------------------------------------------------------
>
> Key: IMPALA-7205
> URL: https://issues.apache.org/jira/browse/IMPALA-7205
> Project: IMPALA
> Issue Type: Sub-task
> Components: Distributed Exec
> Affects Versions: Impala 3.1.0
> Reporter: Dan Hecht
> Assignee: Dan Hecht
> Priority: Major
> Fix For: Impala 2.13.0, Impala 3.1.0
>
>
> Currently we respond with CANCELLED only when hitting EOS. It seems a bit
> more robust to always respond with CANCELLED whenever query execution has
> terminated. That way, if the cancel RPC from the coordinator to a backend
> fails, the backend will still cancel if it can send status back to the
> coordinator later on.
> Without this fix, the query can hang and/or finstances can continue running
> (until the query is closed, at which point the response to this RPC will be
> an error).
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