tree 4ed55d80100864f2418aac38f8adff5372f79c5e
parent 9c44853998705172015626e6e29d1d23a7f9e53e
author Thomas Tauber-Marshall <tmarshall@cloudera.com> 1544056317 -0800
committer Impala Public Jenkins <impala-public-jenkins@cloudera.com> 1544663332 +0000

IMPALA-7926: Fix flakiness in test_reconnect

test_reconnect launches a shell that connects to one impalad in the
minicluster then reconnects to a different impalad while checking that
the impalad's open session metric changes accordingly.

To do this, the test gets the number of open sessions at the start of
the test and then expects that the number of sessions will have
increased by 1 on the impalad that the shell is currently connected
to.

This can be a problem if there is a session left over from another
test that is still active when test_reconnect starts but exits while
it's running.

test_reconnect is already marked to run serially, so there shouldn't
be any other sessions open while it runs anyways. The solution is to
wait at the start of the test until any sessions left over from other
tests have exited.

Testing:
- Ran the test in an environment where the timing was previously
  causing it to fail almost deterministically and it now passes.

Change-Id: I3017ca3bf7b4e33440cffb80e9a48a63bec14434
Reviewed-on: http://gerrit.cloudera.org:8080/12045
Reviewed-by: Impala Public Jenkins <impala-public-jenkins@cloudera.com>
Tested-by: Impala Public Jenkins <impala-public-jenkins@cloudera.com>