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https://issues.apache.org/jira/browse/HBASE-22623?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16886410#comment-16886410
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Andrew Purtell commented on HBASE-22623:
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{quote}instrumentation for the two code paths could be done in separate JIRAs,
a new one for Append + Increment and this one for Batch Mutate. Both would need
to be done to get full coverage, and we'd want them in the same release
{quote}
Yes it could be done this way too.
I'm not making my mind up about this or anything ahead of seeing a patch to
evaluate. Let's consider the code.
> Add RegionObserver coprocessor hook for preWALAppend
> ----------------------------------------------------
>
> Key: HBASE-22623
> URL: https://issues.apache.org/jira/browse/HBASE-22623
> Project: HBase
> Issue Type: New Feature
> Reporter: Geoffrey Jacoby
> Assignee: Geoffrey Jacoby
> Priority: Major
> Fix For: 3.0.0, 1.5.0, 2.3.0
>
>
> While many coprocessor hooks expose the WALEdit to implementing coprocs,
> there aren't any that expose the WALKey before it's created and added to the
> WALEntry.
> It's sometimes useful for coprocessors to be able to edit the WALKey, for
> example to add extended attributes using the fields to be added in
> HBASE-22622.
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