tree f223cae26d11d4f0ee650838c935c9d43cdf32d1
parent fa0869d1f20eb52ee2f649622b964abe51b6dc86
author Todd Lipcon <todd@apache.org> 1535669687 -0700
committer Todd Lipcon <todd@apache.org> 1535736873 +0000

IMPALA-7517. Fix hang in scanner threads when soft limit is exceeded

As described in the JIRA, when scanner threads see that the soft limit
has been exceeded, they try to shut down. In some particular
interleavings, this would cause all of the scanner threads to exit
without any of them marking the scan as completed.

This patch adds a new fault point to inject fake soft limit errors, and
adds this fault point to the scanner test. With the previous placement
of the soft limit check, this caused query hangs pretty reliably. With
the new placement of the memory limit check, it now passes.

Change-Id: I3dc1a2ec79c823575d7d40e7b52216dea5b0ddde
Reviewed-on: http://gerrit.cloudera.org:8080/11369
Tested-by: Impala Public Jenkins <impala-public-jenkins@cloudera.com>
Reviewed-by: Todd Lipcon <todd@apache.org>