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From "Anoop Sam John (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-15470) Add a setting for Priority queue length
Date Tue, 29 Mar 2016 05:58:25 GMT

    [ https://issues.apache.org/jira/browse/HBASE-15470?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15215495#comment-15215495
] 

Anoop Sam John commented on HBASE-15470:
----------------------------------------

Added new config 'hbase.ipc.server.priority.max.callqueue.length'.  Mind adding a release
notes?

> Add a setting for Priority queue length
> ---------------------------------------
>
>                 Key: HBASE-15470
>                 URL: https://issues.apache.org/jira/browse/HBASE-15470
>             Project: HBase
>          Issue Type: Improvement
>          Components: IPC/RPC, Region Assignment
>    Affects Versions: 1.2.0
>            Reporter: Elliott Clark
>            Assignee: Elliott Clark
>             Fix For: 2.0.0, 1.3.0
>
>         Attachments: HBASE-15470.patch
>
>
> Meta can have very different request rates than any other region. We shouldn't use the
same call queue length.
> For example:
> If a normal request takes 100ms ( long scan or large get )
> but a call to meta is all in memory so it takes < 1ms
> So a call queue length of 100 represents multiple seconds of work for normal requests,
but less than a second for meta.



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