[CASSANDRA-14146] [DTEST] cdc_test::TestCDC::test_insertion_and_commitlog_behavior_after_reaching_cdc_total_space assertion always fails (Extra items in the left set)

• Type: Bug
• Status: Resolved
• Priority: Normal
• Resolution: Fixed
• Component/s: Test/dtest/python
• Severity: Normal
• Assignee: Unassigned
• Reporter: Michael Kjellman
• Created: 04/Jan/18 02:08
• Updated: 16/Apr/19 09:29
• Resolved: 08/Jun/18 22:19

Description

Dtest cdc_test::TestCDC::test_insertion_and_commitlog_behavior_after_reaching_cdc_total_space always fails on an assertion.

the assert is the final step of the test and it checks that pre_non_cdc_write_cdc_raw_segments == _get_cdc_raw_files(node.get_path())

This fails 100% of the time locally, 100% of the time on circleci executed under pytest, and 100% of the time for the past 40 test runs on ASF Jenkins runs against trunk.

This is the only test failure (excluding flaky one-off failures) remaining on the pytest dtest branch. I'm going to annotate the test with a skip marker (including a reason reference to this JIRA)... when it's fixed we should also remove the skip annotation from the test.

>       assert pre_non_cdc_write_cdc_raw_segments == _get_cdc_raw_files(node.get_path())
E       AssertionError: assert {'/tmp/dtest-...169.log', ...} == {'/tmp/dtest-v...169.log', ...}
E         Extra items in the left set:
E         '/tmp/dtest-vrn4k8ov/test/node1/cdc_raw/CommitLog-7-1515030005097.log'
E         '/tmp/dtest-vrn4k8ov/test/node1/cdc_raw/CommitLog-7-1515030005098.log'
E         Extra items in the right set:
E         '/tmp/dtest-vrn4k8ov/test/node1/cdc_raw/CommitLog-7-1515030005099.log'
E         '/tmp/dtest-vrn4k8ov/test/node1/cdc_raw/CommitLog-7-1515030005100.log'
E         Use -v to get the full diff