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https://issues.apache.org/jira/browse/HBASE-5589?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13233923#comment-13233923
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Jonathan Hsieh commented on HBASE-5589:
---------------------------------------
I've tested a version of this at adds the offline method "in the middle" of the
HMasterInterface and then setup a cluster with a patched master (check version
hash on web port) and 5 unpatched region servers (check version hash on web
port). Methods below offline included balancer toggles -- I assumed that if
order of declaration mattered the methods after the inserted method would have
compatibility problems. The methods below were balancer() and
balance_switch(bool). I fired up an shell with the prepatched version issued
balancer commands. They succeeded. I fired up a shell with patch version and
issued balancer commands. They also succeeded.
This might be due to some reflection/concidence with jruby so I'm going to dig
into the rpc code to verify as well.
> Add of the offline call to the Master Interface
> -----------------------------------------------
>
> Key: HBASE-5589
> URL: https://issues.apache.org/jira/browse/HBASE-5589
> Project: HBase
> Issue Type: Improvement
> Components: hbck
> Affects Versions: 0.90.6, 0.92.0, 0.94.0, 0.96.0
> Reporter: Jonathan Hsieh
> Assignee: Jonathan Hsieh
>
> Hbck from HBASE-5128 requires an offline method on the master to properly
> cleanup state during certain assignment repair operations. This will this
> method will be added to recent and older versions of HBase.
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