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From "Tyler Patterson (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (CASSANDRA-3821) Counters in super columns don't preserve correct values after cluster restart
Date Wed, 01 Feb 2012 05:38:58 GMT
Counters in super columns don't preserve correct values after cluster restart
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                 Key: CASSANDRA-3821
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-3821
             Project: Cassandra
          Issue Type: Bug
          Components: Core
    Affects Versions: 1.1
         Environment: ubuntu, 'trunk' branch, used ccm to create a 3 node cluster with rf=3.
A dtest was created to demonstrate.
            Reporter: Tyler Patterson


Set up a 3-node cluster with rf=3. Create a counter super column family and increment a bunch
of subcolumns 100 times each, with cf=QUORUM. Then wait a few second, restart the cluster,
and read the values back. They almost all come back different (and higher) then they are supposed
to be.

Here are some extra things I've noticed:
 - Reading back the values before the restart always produces correct results.
 - Doing a nodetool flush before killing the cluster greatly improves the results, though
sometimes a value will still be incorrect. You might have to run the test several times to
see an incorrect value after a flush.
 - This problem doesn't happen on C* 1.0.7, unless you don't sleep between doing the increments
and killing the cluster. Then it sometimes happens to a lesser degree.

The dtest that demonstrates this issue is called "super_counter_test.py". Run it like this:
nosetests --nocapture super_counter_test.py  You'll need ccm from git@github.com:tpatterson/ccm.git.

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