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From "Jeff Jirsa (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-14436) Add sampler for query time and expose with nodetool
Date Thu, 30 Aug 2018 17:45:00 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-14436?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16597722#comment-16597722
] 

Jeff Jirsa commented on CASSANDRA-14436:
----------------------------------------

Asked for second review from [~iamaleksey] because this touches some internals (notably the
changes to the {{ReadExecutionController}} ) where someone with a lot of familiarity with
that code makes sense - also anything in the hot path really deserves two reviewers at this
point in the game.




> Add sampler for query time and expose with nodetool
> ---------------------------------------------------
>
>                 Key: CASSANDRA-14436
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-14436
>             Project: Cassandra
>          Issue Type: Improvement
>            Reporter: Chris Lohfink
>            Assignee: Chris Lohfink
>            Priority: Major
>              Labels: pull-request-available
>             Fix For: 4.0.x
>
>          Time Spent: 0.5h
>  Remaining Estimate: 0h
>
> Create a new {{nodetool profileload}} that functions just like toppartitions but with
more data, returning the slowest local reads and writes on the host during a given duration
and highest frequency touched partitions (same as {{nodetool toppartitions}}). Refactor included
to extend use of the sampler for uses outside of top frequency (max instead of total sample
values).
> Future work to this is to include top cpu and allocations by query and possibly tasks/cpu/allocations
by stage during time window.



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