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From "Jonathan Gray (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-3681) Check the sloppiness of the region load before balancing
Date Tue, 22 Mar 2011 21:06:05 GMT

    [ https://issues.apache.org/jira/browse/HBASE-3681?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13009840#comment-13009840
] 

Jonathan Gray commented on HBASE-3681:
--------------------------------------

For unit tests which expect the old behavior, they should set the sloppiness configuration
to 0 (and we might make that the default value as well, since this change in behavior could
be seen as less optimal in some cases).

Also, why do you do an additional -1 for the min?  If it was left as floor, then setting sloppiness
to 0 would yield exactly the same behavior as we have today.

> 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.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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