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The bug was that the test sometimes polled the wrong impalad for checking metrics because ImpaladCluster() does not guarantee any particular order of impalads, but the test was incorrectly relying on that. The fix is to execute the shell commands on a fixed impalad, and use the same impalad for polling metrics. Change-Id: Iecb528be916d2900d7ec8a894bdef630250547da Reviewed-on: http://gerrit.cloudera.org:8080/1974 Reviewed-by: Alex Behm <alex.behm@cloudera.com> Tested-by: Internal Jenkins