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From "Sylvain Lebresne (Updated) (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (CASSANDRA-3821) Counters in super columns don't preserve correct values after cluster restart
Date Tue, 21 Feb 2012 18:39:46 GMT

     [ https://issues.apache.org/jira/browse/CASSANDRA-3821?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Sylvain Lebresne updated CASSANDRA-3821:
----------------------------------------

    Fix Version/s: 1.1.0
         Assignee: Sylvain Lebresne
    
> Counters in super columns don't preserve correct values after cluster restart
> -----------------------------------------------------------------------------
>
>                 Key: CASSANDRA-3821
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-3821
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Core
>    Affects Versions: 1.1.0
>         Environment: ubuntu, 'trunk' branch, used ccm to create a 3 node cluster with
rf=3. A dtest was created to demonstrate.
>            Reporter: Tyler Patterson
>            Assignee: Sylvain Lebresne
>             Fix For: 1.1.0
>
>
> 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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