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From "Benedict (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-8341) Expose time spent in each thread pool
Date Mon, 01 Dec 2014 14:55:13 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-8341?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14229872#comment-14229872
] 

Benedict commented on CASSANDRA-8341:
-------------------------------------

That is difficult, since we have stages that perform work that does not consume CPU. The RPC
stage (for thrift or cql) both spend the majority of their time _waiting_ for the relevant
work stage to complete. The proposed approaches would count this as busy time. The read and
write stages also can block on IO, the former more often than the latter, but in either case
we would count erroneously.


> Expose time spent in each thread pool
> -------------------------------------
>
>                 Key: CASSANDRA-8341
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-8341
>             Project: Cassandra
>          Issue Type: New Feature
>          Components: Core
>            Reporter: Chris Lohfink
>            Priority: Minor
>              Labels: metrics
>         Attachments: 8341.patch, 8341v2.txt
>
>
> Can increment a counter with time spent in each queue.  This can provide context on how
much time is spent percentage wise in each stage.  Additionally can be used with littles law
in future if ever want to try to tune the size of the pools.



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