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From "Gary Helmling (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HBASE-2883) Req/sec in web UIs are way off when regions are moving
Date Wed, 09 Mar 2011 20:15:59 GMT

     [ https://issues.apache.org/jira/browse/HBASE-2883?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Gary Helmling updated HBASE-2883:
---------------------------------

    Component/s: metrics

> Req/sec in web UIs are way off when regions are moving
> ------------------------------------------------------
>
>                 Key: HBASE-2883
>                 URL: https://issues.apache.org/jira/browse/HBASE-2883
>             Project: HBase
>          Issue Type: Bug
>          Components: metrics
>    Affects Versions: 0.20.5, 0.89.20100621
>            Reporter: Jean-Daniel Cryans
>            Priority: Minor
>
> Now that the region servers can heartbeat back to the master as soon as they have a message
(region open, close, etc), they also recompute their metrics. I see two problems:
>  - The metrics are recomputed way too often, and by the looks of that code it seems quite
intense.
>  - Our UIs are expecting that the value returned by the metrics computation is per second,
but when regions are moving a RS can ping back a few times within a single second. This gives
a very wrong view of the load.
> I think it's time we move metrics computation in it's own separate thread.

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