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From "Chris Herron (JIRA)" <>
Subject [jira] [Commented] (CASSANDRA-4417) invalid counter shard detected
Date Tue, 23 Oct 2012 18:31:13 GMT


Chris Herron commented on CASSANDRA-4417:

bq. I'm really starting to think that CASSANDRA-4071 is likely the main cause for this and
is very easy to reproduce in that case. The commit log we've discussed earlier can also trigger
that error, but it's probably much harder to trigger.

In our case:
* We haven't made any topology changes
* Our test drops and recreates the affected CFs. No nodes die during the test (w.r.t. unclean
shutdown and commit log)
* After previous load test runs under different configuration (see below), no nodes die, and
we use nodetool drain before restarting with updated configs.

Note my earlier comment above I said:

bq. In investigating CASSANDRA-4687 we disabled key cache, repeated the load+upgradesstables
test and these invalid counter shard warnings did not appear.

Given that we don't have a topology change, can you think of a scenario where a commitlog
issue is still contributing?

> invalid counter shard detected 
> -------------------------------
>                 Key: CASSANDRA-4417
>                 URL:
>             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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