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From "Brandon Williams (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-6194) speculative retry can sometimes violate consistency
Date Sun, 13 Oct 2013 18:58:42 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-6194?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13793755#comment-13793755
] 

Brandon Williams commented on CASSANDRA-6194:
---------------------------------------------

Unfortunately I haven't been able to repro manually and ccm has a problem with logging at
debug on 2.0+ currently.  10 iterations of the test should be enough to trigger, though I
bisected again to the same point with 30.

> 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
>             Fix For: 2.0.2
>
>
> 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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