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https://issues.apache.org/jira/browse/HBASE-22256?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16823671#comment-16823671
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Nikhil Bafna commented on HBASE-22256:
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[~xucang] Resubmitted the patch to invoke the QA.
> Enabling FavoredStochasticBalancer on existing cluster leaves regions
> unassigned
> --------------------------------------------------------------------------------
>
> Key: HBASE-22256
> URL: https://issues.apache.org/jira/browse/HBASE-22256
> Project: HBase
> Issue Type: Bug
> Components: Balancer
> Affects Versions: 2.1.3
> Reporter: Nikhil Bafna
> Priority: Major
> Attachments: HBASE-22256.master.001.patch,
> HBASE-22256.master.001.patch, HBASE-22256.master.001.patch
>
>
> This is related to HBASE-18349.
> The test that fails corresponding to this is
> TestFavoredStochasticLoadBalancer#testMisplacedRegions. When a region is
> misplaced w.r.t to the favored nodes, this balancer unassigns the region and
> the new RegionPlan has the source server as null leading to NPE later. This
> leaves the affected regions to be unassigned after the balancer run.
> This is problematic especially when moving from a different balancer to the
> FavoredStochasticLoadBalancer because all regions would be "misplaced" in the
> favored balancer's run.
> The fix is along the lines of HBASE-18602.
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