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https://issues.apache.org/jira/browse/HBASE-21266?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16644314#comment-16644314
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Andrew Purtell commented on HBASE-21266:
----------------------------------------

Better WIP patch. Same as previous WIP patch but toString dumps servers in both 
deadServers and processingServers sets, and puts an asterisk next to servers in 
the processing set, better for debugging

> Not running balancer because processing dead regionservers, but empty dead rs 
> list
> ----------------------------------------------------------------------------------
>
>                 Key: HBASE-21266
>                 URL: https://issues.apache.org/jira/browse/HBASE-21266
>             Project: HBase
>          Issue Type: Bug
>    Affects Versions: 1.4.8
>            Reporter: Andrew Purtell
>            Assignee: Andrew Purtell
>            Priority: Major
>             Fix For: 1.5.0, 1.4.9
>
>         Attachments: HBASE-21266-branch-1.patch, HBASE-21266-branch-1.patch, 
> HBASE-21266-branch-1.patch, HBASE-21266-branch-1.patch, 
> HBASE-21266-branch-1.patch
>
>
> Found during ITBLL testing. AM in master gets into a state where manual 
> attempts from the shell to run the balancer always return false and this is 
> printed in the master log:
> 2018-10-03 19:17:14,892 DEBUG 
> [RpcServer.default.FPBQ.Fifo.handler=21,queue=0,port=8100] master.HMaster: 
> Not running balancer because processing dead regionserver(s): 
> Note the empty list. 
> This errant state did not recover without intervention by way of master 
> restart, but the test environment was chaotic so needs investigation.



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