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From "Ted Yu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-3799) Provide more accurate check for super underloaded region server in load balancer
Date Thu, 13 Sep 2012 22:15:07 GMT

    [ https://issues.apache.org/jira/browse/HBASE-3799?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13455363#comment-13455363
] 

Ted Yu commented on HBASE-3799:
-------------------------------

The notion of young vs. old regions can be more accurately described with various metrics
for read / write on regions.
I will close this JIRA for now.
                
> Provide more accurate check for super underloaded region server in load balancer
> --------------------------------------------------------------------------------
>
>                 Key: HBASE-3799
>                 URL: https://issues.apache.org/jira/browse/HBASE-3799
>             Project: HBase
>          Issue Type: Bug
>          Components: mapreduce
>    Affects Versions: 0.90.2
>            Reporter: Ted Yu
>            Assignee: Ted Yu
>         Attachments: 3799.patch
>
>
> HBASE-3609 used simple check for region server which recently joined the cluster so that
both young and old regions from other region servers are assigned to it.
> The check was too strict.
> 1 or more region may be assigned to this server before load balancer performs rebalancing.
> The next time balancer runs, it wouldn't treat this server as seriously underloaded correctly
and assign a lot of young regions to it.
> We can use threshold over the number of regions to avoid such issue.

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