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https://issues.apache.org/jira/browse/HBASE-22623?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16904119#comment-16904119
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stack edited comment on HBASE-22623 at 8/9/19 7:25 PM:
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bq. "...but what I'm trying to understand is why. "
Because we were afraid to expose this fundamental for others to manipulate.
WALEdit shows up in a bunch of contexts. There is the original write to the
WAL; there is the WAL Replay; and there is replication-time. Any mis-accounting
of Cells or sizes would mess us up. Debugging a cluster with missing or
mis-accounted edits is a time sink. We were being conservative.
A few more notes:
* I'm late to the party. Sorry. Duo raises points I would have. Anoop notes
that there are inconsistencies in our CP API which come to light because
Geoffrey has brought the spotlight. There is no surprise here.
* This is a really good discussion.
was (Author: stack):
bq. "...but what I'm trying to understand is why. "
Because we were afraid to expose this fundamental for others to manipulate.
WALEdit shows up in a bunch of contexts. There is the original write to the
WAL; there is the WAL Replay; and there is replication-time. Any mis-accounting
of Cells or sizes would mess us up. Debugging a cluster with missing or
mis-accounted edits is a time sink. We were being conservative.
> 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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