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On EC2 c3.4xlarge instances, with 8cores and 30GB RAM, this test could trigger the Linux OOM killer by running tests in parallel. This patch switches to serial execution, which makes the test take four minutes, rather than one to two minutes. Change-Id: Iea4a588e1228d38f90387a077cbe530257636b7d Reviewed-on: http://gerrit.cloudera.org:8080/4999 Reviewed-by: Jim Apple <jbapple@cloudera.com> Tested-by: Internal Jenkins