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

             Summary: 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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