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https://issues.apache.org/jira/browse/HBASE-1737?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12738624#action_12738624
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stack commented on HBASE-1737:
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+1 on patch.
> Regions unbalanced when adding new node
> ---------------------------------------
>
> Key: HBASE-1737
> URL: https://issues.apache.org/jira/browse/HBASE-1737
> Project: Hadoop HBase
> Issue Type: Bug
> Affects Versions: 0.20.0
> Reporter: Jonathan Gray
> Assignee: Jonathan Gray
> Priority: Blocker
> Fix For: 0.20.0
>
> Attachments: HBASE-1737-v1.patch
>
>
> When adding a new RegionServer to a cluster, the new RS will receive some
> regions but not enough to actually be considered balanced.
> To recreate, just take an RS offline, allow regions to be reassigned, and
> then bring it back up.
> Master will get itself into a broken, stuck state where it continuously
> outputs a line like this:
> {noformat}
> 2009-08-03 12:54:57,812 DEBUG org.apache.hadoop.hbase.master.RegionManager:
> Server dn4,60020,1249329081079 will be unloaded for balance. Server load: 341
> avg: 318.0, regions can be moved: 55
> {noformat}
> This line is output every 3 seconds and never stops until another RS
> joins/leaves the cluster.
> Making this a blocker because when your new RS only gets some regions (in my
> case, about half as many as it should have), then all new regions will be
> assigned to that RS. This basically destroys any possibility for good load
> distribution with new data.
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