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Posted to issues-all@impala.apache.org by "Thomas Tauber-Marshall (JIRA)" <ji...@apache.org> on 2018/11/14 17:50:00 UTC
[jira] [Resolved] (IMPALA-341) Remote profiles may be ignored by
coordinator if query has a limit
[ https://issues.apache.org/jira/browse/IMPALA-341?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Thomas Tauber-Marshall resolved IMPALA-341.
-------------------------------------------
Resolution: Fixed
Fix Version/s: Impala 3.2.0
This was fixed as a side effect of IMPALA-4063
> Remote profiles may be ignored by coordinator if query has a limit
> ------------------------------------------------------------------
>
> Key: IMPALA-341
> URL: https://issues.apache.org/jira/browse/IMPALA-341
> Project: IMPALA
> Issue Type: Bug
> Components: Backend
> Affects Versions: Impala 1.0, Impala 2.3.0
> Reporter: Henry Robinson
> Assignee: Thomas Tauber-Marshall
> Priority: Major
> Labels: query-lifecycle, supportability
> Fix For: Impala 3.2.0
>
>
> For a query with a {{LIMIT}}, the coordinator cancels remote fragments once the limit has been reached. This can happen before the backends have successfully sent a profile update, and any subsequent updates are ignored because the query is cancelled, so the complete profile is never fleshed out.
> When the query is an {{INSERT}}, it is possible that a race in the coordinator code handling the remote profiles leads to a crash. This only seems to happen occasionally with large clusters (as reported), and we haven't been able to reproduce this internally yet.
> We should probably wait until all backends have completed one way or the other before tearing down a query completely.
> A workaround is to remove the {{LIMIT}}.
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