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From "stack (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-15967) Metric for active ipc Readers and make default fraction of cpu count
Date Mon, 06 Jun 2016 21:58:21 GMT

    [ https://issues.apache.org/jira/browse/HBASE-15967?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15317346#comment-15317346
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stack commented on HBASE-15967:
-------------------------------

Thanks for the useful pointers [~bbeaudreault] Let me see if I can do similar. Our current
metrics suffer another issue, one you do not mention, and that is that they are really expensive
(in perf, w/ this random read loading, the most CPU is spent counting).

> Metric for active ipc Readers and make default fraction of cpu count
> --------------------------------------------------------------------
>
>                 Key: HBASE-15967
>                 URL: https://issues.apache.org/jira/browse/HBASE-15967
>             Project: HBase
>          Issue Type: Sub-task
>            Reporter: stack
>            Assignee: stack
>         Attachments: HBASE-15967.master.001.patch
>
>
> Our ipc Readers are hard coded at 10 regardless since . Running w/ less Readers, we go
faster..(e.g. 12 Readers has us doing 135k with workloadc and 6 readers has us doing 145k)..
.but hard to tell what count of Readers are needed since no metric.
> This issue changes Readers to be 1/4 the installed CPUs or 8, whichever is the minimum,
and then adds a new hbase.regionserver.ipc.runningReaders metric so you have a chance seeing
whats needed.



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