[Gluster-devel] [Gluster-Maintainers] bug-1368312.t

Raghavendra Gowdappa rgowdapp at redhat.com
Mon Aug 13 01:46:33 UTC 2018

Failure of this test is tracked by bz


I was trying to debug regression failures on [1] and observed that
split-brain-resolution.t was failing consistently.

TEST 45 (line 88): 0 get_pending_heal_count patchy
./tests/basic/afr/split-brain-resolution.t .. 45/45 RESULT 45: 1
./tests/basic/afr/split-brain-resolution.t .. Failed 17/45 subtests

Test Summary Report
./tests/basic/afr/split-brain-resolution.t (Wstat: 0 Tests: 45 Failed: 17)
  Failed tests:  24-26, 28-36, 41-45

On probing deeper, I observed a curious fact - on most of the failures
stat was not served from md-cache, but instead was wound down to afr
which failed stat with EIO as the file was in split brain. So, I did
another test:
* disabled md-cache
* mount glusterfs with attribute-timeout 0 and entry-timeout 0

Now the test fails always. So, I think the test relied on stat
requests being absorbed either by kernel attribute cache or md-cache.
When its not happening stats are reaching afr and resulting in
failures of cmds like getfattr etc. Thoughts?

[1] https://review.gluster.org/#/c/20549/

Discussion on this topic can be found on gluster-devel with subj:
regression failures on afr/split-brain-resolution


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