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From Bartłomiej Romański (JIRA) <j...@apache.org>
Subject [jira] [Created] (CASSANDRA-4639) Incorrect counter values
Date Mon, 10 Sep 2012 11:51:07 GMT
Bartłomiej Romański created CASSANDRA-4639:
----------------------------------------------

             Summary: Incorrect counter values
                 Key: CASSANDRA-4639
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-4639
             Project: Cassandra
          Issue Type: Bug
          Components: Core
    Affects Versions: 1.1.2
         Environment: We've got a production 21 node cluster with 3 virtual data centers.
Keyspace that contains counter column families has a replication 3 on DC1 and 1 on DC3. DC1
is using SSD drives, DC3 spinning hard drives. We are using Ubuntu Server as an OS. Machines
have 24GB of RAM. 
            Reporter: Bartłomiej Romański
            Priority: Critical


Since yesterday almost all counters are incorrect. Usually about 4-5 times higher than expected.
In logs we've got this message:

ERROR [MutationStage:15] 2012-09-10 13:47:13,280 CounterContext.java (line 381) invalid counter
shard detected; (6de8e940-dd23-11e1-0000-5233df6faaff, 7, 242) and (6de8e940-dd23-11e1-0000-5233df6faaff,
7, 392) differ only in count; will pick highest to self-heal; this indicates a bug or corruption
generated a bad counter shard

every couple of seconds.

This cluster was running without any serious problems for at least 2 months.

Any ideas?


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