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HDFS acknowledges writes when the first replica is written. As a result, the estimated memory requirements for an Impala query may vary depending on how many replicas existed at the time of table loading. This racey behavior caused a few tests to sometimes fail due to different actual and expected memory requirements. The fix is to exclude the explain header from the expected results. Change-Id: Ifb13de937a104a48960d35745df521de66596837 Reviewed-on: http://gerrit.cloudera.org:8080/762 Reviewed-by: Alex Behm <alex.behm@cloudera.com> Tested-by: Internal Jenkins