[jira] [Commented] (CASSANDRA-4417) invalid counter shard detected

["Peter Schuller (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CASSANDRA-4417?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13407747#comment-13407747 ] 

Peter Schuller commented on CASSANDRA-4417:
-------------------------------------------

You are triggering a self-healing mechanism introduced in CASSANDRA-3641. I can confirm we're seeing it on 1.1 still too, even on sstables that haven't been upgraded from older versions. I don't think anyone knows exactly why it's happening.

The condition being checked for is never supposed to happen. Prior to the CASSANDRA-3641 the result would be counters with values that never converge even with read-repair; post-CASSANDRA-3641 the values converge. But depending on the root cause, it's unclear whether there is a danger of incorrect counter values.

                
> invalid counter shard detected 
> -------------------------------
>
>                 Key: CASSANDRA-4417
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-4417
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Core
>    Affects Versions: 1.1.1
>         Environment: Amazon Linux
>            Reporter: Senthilvel Rangaswamy
>
> Seeing errors like these:
> 2012-07-06_07:00:27.22662 ERROR 07:00:27,226 invalid counter shard detected; (17bfd850-ac52-11e1-0000-6ecd0b5b61e7, 1, 13) and (17bfd850-ac52-11e1-0000-6ecd0b5b61e7, 1, 1) differ only in count; will pick highest to self-heal; this indicates a bug or corruption generated a bad counter shard
> What does it mean ?

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