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https://issues.apache.org/jira/browse/CASSANDRA-6194?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13802020#comment-13802020
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Sylvain Lebresne commented on CASSANDRA-6194:
---------------------------------------------
For the record, the error returned by the dtest is:
{noformat}
======================================================================
FAIL: short_read_reversed_test (consistency_test.TestConsistency)
----------------------------------------------------------------------
Traceback (most recent call last):
File "/home/mcmanus/Git/dtest-cassandra/consistency_test.py", line 309, in
short_read_reversed_test
assert res[i][1] == 'value%d' % (5-i), 'Expecting value%d, got %s (%s)' %
(5-i, res[i][1], str(res))
AssertionError: Expecting value5, got value8 ([[u'c000008', u'value8'],
[u'c000005', u'value5'], [u'c000004', u'value4']])
----------------------------------------------------------------------
Ran 1 test in 130.035s
{noformat}
> speculative retry can sometimes violate consistency
> ---------------------------------------------------
>
> Key: CASSANDRA-6194
> URL: https://issues.apache.org/jira/browse/CASSANDRA-6194
> Project: Cassandra
> Issue Type: Bug
> Components: Core
> Reporter: Brandon Williams
> Assignee: Jonathan Ellis
> Fix For: 2.0.2
>
> Attachments: 6194.txt
>
>
> This is most evident with intermittent failures of the short_read dtests.
> I'll focus on short_read_reversed_test for explanation, since that's what I
> used to bisect. This test inserts some columns into a row, then deletes a
> subset, but it performs each delete on a different node, with another node
> down (hints are disabled.) Finally it reads the row back at QUORUM and
> checks that it doesn't see any deleted columns, however with speculative
> retry on this often fails. I bisected this to the change that made 99th
> percentile SR the default reliably by looping the test enough times at each
> iteration to be sure it was passing or failing.
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