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From "Elliott Clark (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-6720) Optionally limit number of regions balanced in each balancer run
Date Mon, 10 Sep 2012 22:46:07 GMT

    [ https://issues.apache.org/jira/browse/HBASE-6720?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13452544#comment-13452544

Elliott Clark commented on HBASE-6720:

[~lhofhansl] Sorry what I wrote was unclear.  I meant to say:  The code Ted posted won't stop
the load balancer from moving lots of regions if the region moves happen quickly.  cutoffTime
is some time way in the future assuming that things are going normally.  So since applying
the plans is usually very quick.  All of the plans will be applied. 

If anything I would stopping the LoadBalancer from moving after a certain number of regions
is more useful than stopping it after a number of milliseconds. It's easier to for users to
know a good starting value that applies to their cluster.  There's no way I could tell you
right now how long a balance on our cluster takes when a RegionServer goes down.  However
I could say the max number of regions that I would want to move at a time.
> Optionally limit number of regions balanced in each balancer run
> ----------------------------------------------------------------
>                 Key: HBASE-6720
>                 URL: https://issues.apache.org/jira/browse/HBASE-6720
>             Project: HBase
>          Issue Type: Bug
>            Reporter: Lars Hofhansl
>             Fix For: 0.96.0, 0.94.3
>         Attachments: 6720-0.96-v1.txt
> See discussion on HBASE-3866

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