[DISPATCH-1497] [test] system_tests_fallback_dest test times out occasionally

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Cannot Reproduce
• Affects Version/s: 1.9.0
• Fix Version/s: 1.12.0
• Component/s: Router Node, Tools

Environment

Fedora 29. Proton 0.29.0

• Assignee: Ted Ross
• Reporter: Charles E. Rolke
• Created: 25/Nov/19 21:50
• Updated: 08/Jun/20 19:19
• Resolved: 08/Jun/20 19:19

Description

The fallback_dest typically completes in 40-45 seconds on my machine. Occasionally, the test times out with:

61:   File "/home/chug/git/qpid-dispatch/tests/system_tests_fallback_dest.py", line 350, in test_35_switchover_mix_1
61:     self.assertEqual(None, test.error)
61: AssertionError: None != 'Timeout Expired - n_tx=0, n_rx=0, n_rel=2799, phase=1'

61: Ran 50 tests in 100.831s

Increasing the test timeout from 60 to 240 seconds produces the same result but it takes a total of 280 seconds.

In all recorded failures the counters n_tx=0 and n_rx=0 are the same. The n_rel varies around 2800 (2799, 2816).

The most successful loops before a failure was 120. Usually it fails in around 10 loops.