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Currently, if a ReleaseQuery rpc fails, it's possible for the admission service to think that some resources are still being used that are actually free. This patch fixes the issue by introducing a periodic heartbeat rpc from coordinators to the admission service which contains a list of queries registered at that coordinator. If there is a query that the admission service thinks is running but is not included in the heartbeat, the admission service can conclude that the query must have already completed and release its resources. Testing: - Added a test that uses a debug action to simulate ReleaseQuery rpcs failing and checks that query resources are released properly. Change-Id: Ia528d92268cea487ada20b476935a81166f5ad34 Reviewed-on: http://gerrit.cloudera.org:8080/17194 Reviewed-by: Impala Public Jenkins <impala-public-jenkins@cloudera.com> Tested-by: Impala Public Jenkins <impala-public-jenkins@cloudera.com>