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Posted to issues@hbase.apache.org by "Nicolas Spiegelberg (JIRA)" <ji...@apache.org> on 2011/07/14 01:12:59 UTC
[jira] [Commented] (HBASE-862) region balancing is clumsy
[ https://issues.apache.org/jira/browse/HBASE-862?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13064940#comment-13064940 ]
Nicolas Spiegelberg commented on HBASE-862:
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We got bit by this in our 89 branch a couple weeks back. Looking at the trunk and I don't see "hbase.regions.close.max" anywhere? Is this still an issue? What are we doing to limit regionsToMove.size()?
> region balancing is clumsy
> --------------------------
>
> Key: HBASE-862
> URL: https://issues.apache.org/jira/browse/HBASE-862
> Project: HBase
> Issue Type: Bug
> Reporter: stack
>
> Daniel Leffel has an install of 500 regions on 4 nodes. He's running 0.2.0.
> On restart, load balancing is running while the 600 regions are being initially opened. Makes for churn. Load balancing should wait before it cuts in.
> Have also seen on occasion that it will not find equilibrium after a restart.
> Adding a node is catastrophic. >20% of the regions were closed and were taking the longest time to show up on the new server. I would think that the region balancing would work in more sophisticated and gradual manner.
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