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https://issues.apache.org/jira/browse/HBASE-14517?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15175115#comment-15175115
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stack commented on HBASE-14517:
-------------------------------

I just ran into issue where I had a cluster of mixed versions. It would have 
taken me a while to notice but at the base of my list of regionservers, there 
was a helpful '      9 nodes with inconsistent version'.. Nice. Thanks.

> Show regionserver's version in master status page
> -------------------------------------------------
>
>                 Key: HBASE-14517
>                 URL: https://issues.apache.org/jira/browse/HBASE-14517
>             Project: HBase
>          Issue Type: Improvement
>          Components: monitoring
>            Reporter: Liu Shaohui
>            Assignee: Liu Shaohui
>            Priority: Minor
>             Fix For: 2.0.0, 1.2.0, 1.3.0
>
>         Attachments: HBASE-14517-v1.diff, HBASE-14517-v1.patch, 
> HBASE-14517-v2.patch
>
>
> In production env, regionservers may be removed from the cluster for hardware 
> problems and rejoined the cluster after the repair. There is a potential risk 
> that the version of rejoined regionserver may diff from others because the 
> cluster has been upgraded through many versions. 
> To solve this, we can show the all regionservers' version in the server list 
> of master's status page, and highlight the regionserver when its version is 
> different from the master's version, similar to HDFS-3245
> Suggestions are welcome~



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