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https://issues.apache.org/jira/browse/HBASE-14232?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14701523#comment-14701523
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Andrew Purtell commented on HBASE-14232:
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bq. We can generically do this for all types of CPs? So later on we can add
hooks to CPs with out worry for BC.
We already have some reusable support for this from when Sean updated the
WALObserver. It's reasonable to aim for as much reuse as we can get when doing
the work here.
> Backwards compatiblity support for new MasterObserver APIs
> ----------------------------------------------------------
>
> Key: HBASE-14232
> URL: https://issues.apache.org/jira/browse/HBASE-14232
> Project: HBase
> Issue Type: Sub-task
> Reporter: Andrew Purtell
> Labels: hbase-6721
>
> The group assignment changes introduce new methods to the MasterObserver
> interface. This is a concern for things like Apache Phoenix. (See their
> IndexMasterObserver, etc.) We can handle this by using compatibility helpers
> that won't attempt to invoke the new APIs on MasterObservers that do not
> implement them.
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