[IMPALA-9073] Failed test during pre-commit: custom_cluster.test_executor_groups.TestExecutorGroups.test_executor_concurrency

• Type: Bug
• Status: Resolved
• Priority: Critical
• Resolution: Fixed
• Fix Version/s: Impala 3.4.0
• Component/s: Backend
• Labels: build-failure flaky
• Target Version: Impala 3.4.0
• Epic Color: ghx-label-14
• Assignee: Tim Armstrong
• Reporter: Anurag Mantripragada
• Created: 20/Oct/19 22:28
• Updated: 01/Nov/19 22:33
• Resolved: 01/Nov/19 22:33

Description

Observed this test failure in pre-commit test of an unrelated change. Looks like the expected number of concurrent queries reached 4 while it is expected to be 3 or less.

custom_cluster/test_executor_groups.py:293: in test_executor_concurrency
    assert max(num_running) == 3, \
E   AssertionError: Unexpected number of running queries: [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3]
E   assert 4 == 3
E    +  where 4 = max([3, 3, 3, 3, 3, 3, ...])