[IMPALA-9357] Fix race condition in alter_database event

• Type: Bug
• Status: Resolved
• Priority: Blocker
• Resolution: Fixed
• Fix Version/s: Impala 4.0, Impala 3.4.0
• Labels: broken-build flaky-test
• Target Version: Impala 4.0, Impala 3.4.0
• Epic Color: ghx-label-7
• Assignee: Vihang Karajgaonkar
• Reporter: Fang-Yu Rao
• Created: 04/Feb/20 17:04
• Updated: 22/Mar/20 06:40
• Resolved: 22/Mar/20 06:40

Description

The EE test test_self_events seems flaky. In what follows the stacktrace is provided.

Stacktrace
custom_cluster/test_event_processing.py:167: in test_self_events
    self.__run_self_events_test(unique_database, True)
custom_cluster/test_event_processing.py:232: in __run_self_events_test
    self.__exec_sql_and_check_selfevent_counter(stmt, use_impala)
custom_cluster/test_event_processing.py:388: in __exec_sql_and_check_selfevent_counter
    assert self_events_after > self_events
E   assert 1 > 1

Since this test was recently added by https://issues.apache.org/jira/browse/IMPALA-9101 and reviewed by Quanlong Huang, maybe you could provide some insight into it? The JIRA is assigned to Vihang Karajgaonkar for now, but please feel free to re-assign it to others as appropriate. Thanks!