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This patch removes executor groups from cluster membership after they have no executors, so that executor groups' configurations can be updated without restarting all impalads in the cluster. Testing: - Added an e2e test to verify the new functionality. Change-Id: I480b84b26a780d345216004f1a4657c7b95dda45 Reviewed-on: http://gerrit.cloudera.org:8080/19468 Tested-by: Impala Public Jenkins <impala-public-jenkins@cloudera.com> Reviewed-by: Wenzhe Zhou <wzhou@cloudera.com>