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https://issues.apache.org/jira/browse/HBASE-17312?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15868872#comment-15868872
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Appy commented on HBASE-17312:
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I would suggest deleting the Base...Observer classes since
- it's 2.0, we can break compatability
- we won't have to maintaining these deprecated classes. Right now every time a
master or region hook is added, we have to duplicate it in two other places.
- it would be breeze for third parties to fix this breakage; just one line
change. "extends BaseFooObserver" -> "implements FooObserver".
> [JDK8] Use default method for Observer Coprocessors
> ---------------------------------------------------
>
> Key: HBASE-17312
> URL: https://issues.apache.org/jira/browse/HBASE-17312
> Project: HBase
> Issue Type: Sub-task
> Components: Coprocessors
> Affects Versions: 2.0.0
> Reporter: Guanghao Zhang
> Assignee: Guanghao Zhang
> Attachments: HBASE-17312.master.001.patch,
> HBASE-17312.master.001.patch
>
>
> Use default method in MasterObserver, RegionObserver, RegionServerObserver
> and WALObserver. And mark the BaseRegionObserver,
> BaseMasterAndRegionObserver, BaseRegionServerObserver and BaseWALObserver.
> User can implement the interface directly and will not break compatibility
> when add new default methods.
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