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https://issues.apache.org/jira/browse/HBASE-8457?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13644899#comment-13644899
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Enis Soztutar commented on HBASE-8457:
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One option, we discussed at HBASE-2231 was to add a KeyValue.Type specific for 
this. But this is fundamentally different than adding the type to the wal edit 
and not clear whether it will be better. Adding a type to waledit seems more 
appealing. 

                
> add support for custom entries to PB WAL
> ----------------------------------------
>
>                 Key: HBASE-8457
>                 URL: https://issues.apache.org/jira/browse/HBASE-8457
>             Project: HBase
>          Issue Type: Improvement
>            Reporter: Sergey Shelukhin
>
> Right now custom records are written by using fake KVs. With protobuf WAL, 
> maybe we can use PB.
> I took a stab at it in HBASE-7413, but the changes will be large on top of 
> that change, including probably merging HLogKey and WALEdit refactoring, to 
> not add another entity for custom message. So I am going to preserve the 
> fake-KV-based approach in HBASE-7413 and file this JIRA.

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