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https://issues.apache.org/jira/browse/HBASE-22623?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16902239#comment-16902239
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Andrew Purtell commented on HBASE-22623:
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For the record I am not -1 to the previous version of the patch which did not
include WALedit in the new hook. I am however of the opinion that the goal is
to intercept WALentries, and they are composed of WALKey and WALEdit, so adding
a hook that only has WALKey and not WALEdit would be dumb. We can do that as
"compromise". It would be a dumb outcome, though, collectively, we would make a
dumb engineering decision.
> 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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