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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HBASE-3401) Region IPC operations should be high priority
Date Thu, 30 Dec 2010 21:37:46 GMT

     [ https://issues.apache.org/jira/browse/HBASE-3401?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Todd Lipcon updated HBASE-3401:
-------------------------------

    Attachment: hbase-3401.txt

Here's a patch which adds a new QosPriority annotation which can be used to prioritize things
more easily right in the interface.

We can eventually extend this to be more generalized, but this should work for now and make
it more obvious when adding new RPCs how to prioritize them.

> Region IPC operations should be high priority
> ---------------------------------------------
>
>                 Key: HBASE-3401
>                 URL: https://issues.apache.org/jira/browse/HBASE-3401
>             Project: HBase
>          Issue Type: Bug
>          Components: regionserver
>    Affects Versions: 0.90.1
>            Reporter: Todd Lipcon
>            Assignee: Todd Lipcon
>             Fix For: 0.90.1
>
>         Attachments: hbase-3401.txt
>
>
> I manufactured an imbalanced cluster so one region server had 300 regions and the others
had very few. I then ran balancer while hitting the high-load region server with YCSB. I observed
that the rate of load shedding was VERY slow since the closeRegion IPCs were getting stuck
at the back of the IPC queue.
> All of these important master->RS RPC calls should be set to high priority.

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