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From "Ted Yu (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-3681) Check the sloppiness of the region load before balancing
Date Tue, 22 Mar 2011 22:14:05 GMT

     [ https://issues.apache.org/jira/browse/HBASE-3681?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Ted Yu updated HBASE-3681:
--------------------------

    Attachment: hbase-3681-v2.txt

Second version.
TestLoadBalancer, TestRegionRebalancing, TestMultiParallel and TestMasterObserver pass.
Changed default slop to 0 so that behavior is consistent with 0.90.1

> Check the sloppiness of the region load before balancing
> --------------------------------------------------------
>
>                 Key: HBASE-3681
>                 URL: https://issues.apache.org/jira/browse/HBASE-3681
>             Project: HBase
>          Issue Type: Improvement
>    Affects Versions: 0.90.1
>            Reporter: Jean-Daniel Cryans
>            Assignee: Ted Yu
>             Fix For: 0.92.0
>
>         Attachments: hbase-3681-v2.txt, hbase-3681.txt
>
>
> Per our discussion at the hackathon today, it seems that it would be more helpful to
add a sloppiness check before doing the normal balancing.
> The current situation is that the balancer always tries to get the region load even,
meaning that there can be some very frequent regions movement.
> Setting the balancer to run less often (like every 4 hours) isn't much better since the
load could get out of whack easily.
> This is why running the normal balancer frequently, but first checking for some sloppiness
in the region load across the RS, seems like a more viable option.

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