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From "Paulo Motta (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-10580) On dropped mutations, more details should be logged.
Date Wed, 16 Dec 2015 02:08:46 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-10580?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15059350#comment-15059350
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Paulo Motta commented on CASSANDRA-10580:
-----------------------------------------

* Use {{TimeUnit.NANOSECONDS.toMillis}} instead of {{TimeUnit.MILLISECONDS.convert}}
* Change log message from "Mean InternalDroppedLatency: %d ms and Mean CrossNodeDroppedLatency:
%d ms" to "Mean internal dropped latency: %d ms. Mean cross-node dropped latency: %d ms."
* Provide 2.2 patch

> On dropped mutations, more details should be logged.
> ----------------------------------------------------
>
>                 Key: CASSANDRA-10580
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-10580
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Coordination
>         Environment: Production
>            Reporter: Anubhav Kale
>            Assignee: Anubhav Kale
>            Priority: Minor
>             Fix For: 3.2, 2.2.x
>
>         Attachments: 0001-Metrics.patch, 10580-Metrics.patch, 10580.patch, CASSANDRA-10580-Head.patch,
Trunk.patch
>
>
> In our production cluster, we are seeing a large number of dropped mutations. At a minimum,
we should print the time the thread took to get scheduled thereby dropping the mutation (We
should also print the Message / Mutation so it helps in figuring out which column family was
affected). This will help find the right tuning parameter for write_timeout_in_ms. 
> The change is small and is in StorageProxy.java and MessagingTask.java. I will submit
a patch shortly.



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