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From "Jonathan Gray (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-1676) load balancing on a large cluster doesn't work very well
Date Wed, 01 Sep 2010 05:32:53 GMT

    [ https://issues.apache.org/jira/browse/HBASE-1676?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12904922#action_12904922

Jonathan Gray commented on HBASE-1676:

There are standalone tests of the new load balancer!  This is open against 0.90.  Do we want
to close it or what exactly is the scope of this jira?  IMO this is done, other stuff can
be handled in "smart" load balancing and other open jiras.

> load balancing on a large cluster doesn't work very well
> --------------------------------------------------------
>                 Key: HBASE-1676
>                 URL: https://issues.apache.org/jira/browse/HBASE-1676
>             Project: HBase
>          Issue Type: Bug
>    Affects Versions: 0.20.0
>            Reporter: ryan rawson
>             Fix For: 0.90.0
> I have 200 regions per server in my cluster.  When I take one down, then bring it back
up, I only end up with about 30 regions assigned to it.  This is highly reproducible.
> Furthermore, the assignment algorithm will do silly things like assign all regions of
a table to one regionserver - even if it's the best server.  We need to be smarter about optimizing
how regions are assigned if we want to achieve maximal performance on our clusters.

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