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From "Lars Hofhansl (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-4365) Add a decent heuristic for region size
Date Fri, 24 Feb 2012 03:13:56 GMT

    [ https://issues.apache.org/jira/browse/HBASE-4365?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13215336#comment-13215336

Lars Hofhansl commented on HBASE-4365:

@Stack: Yeah, power of three is probably too much.
In the last comment I was referring to the upper bound of 3 regions per regionserver that
you suggested, at which point we set the split size to region size.

@J-D: so in some cases we increase latency with this patch? Not saying it's a problem just

+1 on patch.

> Add a decent heuristic for region size
> --------------------------------------
>                 Key: HBASE-4365
>                 URL: https://issues.apache.org/jira/browse/HBASE-4365
>             Project: HBase
>          Issue Type: Improvement
>    Affects Versions: 0.92.1, 0.94.0
>            Reporter: Todd Lipcon
>            Priority: Critical
>              Labels: usability
>         Attachments: 4365-v2.txt, 4365.txt
> A few of us were brainstorming this morning about what the default region size should
be. There were a few general points made:
> - in some ways it's better to be too-large than too-small, since you can always split
a table further, but you can't merge regions currently
> - with HFile v2 and multithreaded compactions there are fewer reasons to avoid very-large
regions (10GB+)
> - for small tables you may want a small region size just so you can distribute load better
across a cluster
> - for big tables, multi-GB is probably best

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