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https://issues.apache.org/jira/browse/HBASE-5487?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13536463#comment-13536463
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Andrew Purtell commented on HBASE-5487:
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bq. Any chance you could describe in more detail what you have in mind? 

Coprocessor "applications" that are running a MasterObserver or MasterEndpoint 
are very likely going to want to take advantage of a generic framework for 
master-coordinated tasks, so whatever API there is for this, should be 
available via MasterServices I'd say.
                
> Generic framework for Master-coordinated tasks
> ----------------------------------------------
>
>                 Key: HBASE-5487
>                 URL: https://issues.apache.org/jira/browse/HBASE-5487
>             Project: HBase
>          Issue Type: New Feature
>          Components: master, regionserver, Zookeeper
>    Affects Versions: 0.94.0
>            Reporter: Mubarak Seyed
>            Assignee: Nick Dimiduk
>
> Need a framework to execute master-coordinated tasks in a fault-tolerant 
> manner. 
> Master-coordinated tasks such as online-scheme change and delete-range 
> (deleting region(s) based on start/end key) can make use of this framework.
> The advantages of framework are
> 1. Eliminate repeated code in Master, ZooKeeper tracker and Region-server for 
> master-coordinated tasks
> 2. Ability to abstract the common functions across Master -> ZK and RS -> ZK
> 3. Easy to plugin new master-coordinated tasks without adding code to core 
> components

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