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Dan Hecht commented on IMPALA-341: ---------------------------------- Once this is fixed let's consider which of the commits in IMPALA-6338 should be reverted. > 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 > > 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}}. -- This message was sent by Atlassian JIRA (v7.6.3#76005) --------------------------------------------------------------------- To unsubscribe, e-mail: issues-all-unsubscr...@impala.apache.org For additional commands, e-mail: issues-all-h...@impala.apache.org