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https://issues.apache.org/jira/browse/HBASE-18131?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16167677#comment-16167677
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Guangxu Cheng commented on HBASE-18131:
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bq.Can you check the hbaseprotoc warnings ?
the patch pass locally. 
https://builds.apache.org/job/PreCommit-HBASE-Build/8595/artifact/patchprocess/patch-hbaseprotoc-hbase-protocol.txt
Since this file does not exist, so I do not know why these warnings appear.:(
By the way, I only updated the file Master.proto which located at 
hbase-protocol. But hbase-client/hbase-server/hbase-shell all  have hbaseprotoc 
warnings. Maybe these hbaseprotoc warnings are unrelated.(?)

> Add an hbase shell command to clear deadserver list in ServerManager
> --------------------------------------------------------------------
>
>                 Key: HBASE-18131
>                 URL: https://issues.apache.org/jira/browse/HBASE-18131
>             Project: HBase
>          Issue Type: New Feature
>          Components: Operability
>            Reporter: Yu Li
>            Assignee: Guangxu Cheng
>             Fix For: 2.0.0, 1.4.0
>
>         Attachments: HBASE-18131.branch-1.v1.patch, 
> HBASE-18131.branch-1.v2.patch, HBASE-18131.master.v1.patch, 
> HBASE-18131.master.v2.patch, HBASE-18131.master.v3.patch, 
> HBASE-18131.master.v4.patch, HBASE-18131.master.v5.patch, 
> HBASE-18131.master.v6.patch, HBASE-18131.master.v6.patch, 
> HBASE-18131.master.v7.patch, HBASE-18131.patch
>
>
> Currently if a regionserver is aborted due to fatal error or stopped by 
> operator on purpose, it will be added into {{ServerManager#deadservers}} list 
> and shown as "Dead Servers" in the master UI. This is a valid warn for 
> operators to  notice the self-aborted servers and give a sanity check to 
> avoid further issues. However, after necessary checks, even if operator is 
> sure that the node is decommissioned (such as for repair), there's no way to 
> clear the dead server list except restarting master. See more details in 
> [this 
> discussion|http://mail-archives.apache.org/mod_mbox/hbase-user/201705.mbox/%3CCAM7-19%2BD4MLu2b1R94%2BtWQDspjfny2sCy4Qit8JtCgjvTOZzzg%40mail.gmail.com%3E]
>  in mail list
> Here we propose to add a hbase shell command to allow clearing dead server 
> list in {{ServerManager}} for advanced users, and the command should be 
> executed with caution.



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