[jira] [Created] (IMPALA-7828) test_mem_leak() is flaky

["Michael Ho (JIRA)" <ji...@apache.org>]

Michael Ho created IMPALA-7828:
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             Summary: test_mem_leak() is flaky
                 Key: IMPALA-7828
                 URL: https://issues.apache.org/jira/browse/IMPALA-7828
             Project: IMPALA
          Issue Type: Bug
          Components: Backend
    Affects Versions: Impala 3.2.0
            Reporter: Michael Ho
            Assignee: Michael Ho


Before IMPALA-4063, the error message detected during {{FragmentInstanceState::Close()} was always lost. After IMPALA-4063, we may sometimes get the error message in {{FragmentInstanceState::Close()}}. It's non-deterministic as the fragment instance thread may race with the query state thread which reports the final status. The test currently tries to handle this non-determinism by using "row_regex:.*" in the {{--ERRORS--}} section but it doesn't seem to work. 

Let's unbreak the test for now. Longer run, we need to move the point in which all fragment instances are done after {{FragmentInstanceState::Close()}} so things will become deterministic. This may have implication to query completion time so performance may need to be evaluated.

{noformat}
Stacktrace
query_test/test_udfs.py:313: in test_ir_functions
    self.run_test_case('QueryTest/udf-no-expr-rewrite', vector, use_db=unique_database)
common/impala_test_suite.py:496: in run_test_case
    self.__verify_results_and_errors(vector, test_section, result, use_db)
common/impala_test_suite.py:358: in __verify_results_and_errors
    replace_filenames_with_placeholder)
common/test_result_verifier.py:362: in verify_raw_results
    verify_errors(expected_errors, actual_errors)
common/test_result_verifier.py:314: in verify_errors
    VERIFIER_MAP['VERIFY_IS_EQUAL'](expected, actual)
common/test_result_verifier.py:271: in verify_query_result_is_equal
    assert expected_results == actual_results
E   assert Comparing QueryTestResults (expected vs actual):
E     row_regex:.* != None
E     Number of rows returned (expected vs actual): 1 != 0
{noformat}



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