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Apparently test_query_cancellation_during_fetch hangs occasionally in Jenkins builds. The Impala debug page shows the query being cancelled, however, on the host the ImpalaShell process related to that query is still running. Since I had no luck in reproducing the issue locally I only have a theory what might be going on here: The query is cancelled successfully on Impala backend and when the test tries to get the stdout and stderr from the ImpalaShell it gets stuck. It might be the case that ImpalaShell process fetching the query results holds the stdout. According to the documentation of subprocess.communicate() it may cause issues to fetch data when the data size is large or unlimited, that we can consider to be the case here. As a workaround there is a new optional parameter to util.ImpalaShell to omit the stdout because this test wouldn't use it anyway and we get rid of fetching the large result from ImpalaShell. Change-Id: I082c83b91b6d0c527de92c7992f0dc9d1b290433 Reviewed-on: http://gerrit.cloudera.org:8080/8852 Reviewed-by: Tim Armstrong <tarmstrong@cloudera.com> Tested-by: Impala Public Jenkins