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From "ryan rawson (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-3507) requests count per HRegion and rebalance command
Date Mon, 07 Feb 2011 21:10:02 GMT

    [ https://issues.apache.org/jira/browse/HBASE-3507?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12991609#comment-12991609
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ryan rawson commented on HBASE-3507:
------------------------------------

how frequently would you move regions?  Moving a highly loaded region under load might be
more disruptive than leaving where it is... Using a more sophisticated algorithm that uses
a decaying moving average over some period of time seems like that might have a better impact.
 For example do you move a region because it gets hot for 30 seconds? 1 minute? 5 minutes?
10 minutes even?  I'm not sure where the line is, but it seems like the goal should be to
move regions for persistent high long term load, not transient spikes.

Thoughts?

> requests count per HRegion and rebalance command
> ------------------------------------------------
>
>                 Key: HBASE-3507
>                 URL: https://issues.apache.org/jira/browse/HBASE-3507
>             Project: HBase
>          Issue Type: Improvement
>          Components: performance, regionserver
>            Reporter: Sebastian Bauer
>            Priority: Trivial
>         Attachments: hbase-requestsCount-2.patch, hbase-requestsCount.patch
>
>
> Path-1 add another mertic for HRegion to count request made to region.
> Path-2 add another command to hbase shell to grab all regions, sort by requests from
Path-1 and move in round-robin algorithm to servers

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