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https://issues.apache.org/jira/browse/CASSANDRA-4417?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13421432#comment-13421432
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Michael Theroux commented on CASSANDRA-4417:
--------------------------------------------

I just hit this myself on 1.1.2 on two nodes of a six node cluster.  The 
cluster has been stable for a couple of weeks.

If it makes any difference, we recently enabled row-caching.

...
INFO [AntiEntropyStage:1] 2012-07-24 11:05:55,537 AntiEntropyService.java (line 
206) [repair #b9355020-d57e-11e1-0000-7c4549350fdf] Received merkle tree for 
caches from /10.29.214.111
ERROR [CompactionExecutor:183] 2012-07-24 11:05:58,532 CounterContext.java 
(line 381) invalid counter shard detected; 
(6be74ab0-6cc6-11e1-0000-242d50cf1fd7, 1, -1) and 
(6be74ab0-6cc6-11e1-0000-242d50cf1fd7, 1, 1) differ only in count; will pick 
highest to self-heal; this indicates a bug or corruption generated a bad 
counter shard
ERROR [CompactionExecutor:183] 2012-07-24 11:05:58,533 CounterContext.java 
(line 381) invalid counter shard detected; 
(6be74ab0-6cc6-11e1-0000-242d50cf1fd7, 1, 1) and 
(6be74ab0-6cc6-11e1-0000-242d50cf1fd7, 1, -1) differ only in count; will pick 
highest to self-heal; this indicates a bug or corruption generated a bad 
counter shard
ERROR [CompactionExecutor:183] 2012-07-24 11:05:58,534 CounterContext.java 
(line 381) invalid counter shard detected; 
(6be74ab0-6cc6-11e1-0000-242d50cf1fd7, 1, -1) and 
(6be74ab0-6cc6-11e1-0000-242d50cf1fd7, 1, 1) differ only in count; will pick 
highest to self-heal; this indicates a bug or corruption generated a bad 
counter shard
ERROR [CompactionExecutor:183] 2012-07-24 11:05:58,534 CounterContext.java 
(line 381) invalid counter shard detected; 
(6be74ab0-6cc6-11e1-0000-242d50cf1fd7, 1, 1) and 
(6be74ab0-6cc6-11e1-0000-242d50cf1fd7, 1, -1) differ only in count; will pick 
highest to self-heal; this indicates a bug or corruption generated a bad 
counter shard
ERROR [CompactionExecutor:183] 2012-07-24 11:05:58,534 CounterContext.java 
(line 381) invalid counter shard detected; 
(6be74ab0-6cc6-11e1-0000-242d50cf1fd7, 1, -1) and 
(6be74ab0-6cc6-11e1-0000-242d50cf1fd7, 1, 1) differ only in count; will pick 
highest to self-heal; this indicates a bug or corruption generated a bad 
counter shard
ERROR [CompactionExecutor:183] 2012-07-24 11:05:58,535 CounterContext.java 
(line 381) invalid counter shard detected; 
(6be74ab0-6cc6-11e1-0000-242d50cf1fd7, 1, 1) and 
(6be74ab0-6cc6-11e1-0000-242d50cf1fd7, 1, -1) differ only in count; will pick 
highest to self-heal; this indicates a bug or corruption generated a bad 
counter shard
 INFO [AntiEntropyStage:1] 2012-07-24 11:06:05,541 AntiEntropyService.java 
(line 206) [repair #b9355020-d57e-11e1-0000-7c4549350fdf] Received merkle tree 
for caches from /10.144.15.6
...
                
> 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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