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https://issues.apache.org/jira/browse/HBASE-4583?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13489834#comment-13489834
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Lars Hofhansl commented on HBASE-4583:
--------------------------------------
RowMutation is currently limited to Puts and Deletes. Generalizing this is not
trivial:
* You have make all the changes to the WAL first, sync the WAL, then change the
memstore
* Potentially you want to release the row lock before the WAL-sync, which mean
a rollback phase to the memstore if the WAL sync failed, etc.
* Puts and Deletes only need snapshot isolation for consistency, whereas
Increment and Append need to be serializable.
* Put/Delete/etc are idempotent (client can retry on error) whereas
Incement/Append generally aren't (we could make so by passing tokens along).
Long way of saying: It's possible, but maybe not as simple as might imagine. :)
> Integrate RWCC with Append and Increment operations
> ---------------------------------------------------
>
> Key: HBASE-4583
> URL: https://issues.apache.org/jira/browse/HBASE-4583
> Project: HBase
> Issue Type: Bug
> Reporter: Lars Hofhansl
> Assignee: Lars Hofhansl
> Fix For: 0.96.0
>
> Attachments: 4583-trunk-less-radical.txt,
> 4583-trunk-less-radical-v2.txt, 4583-trunk-less-radical-v3.txt,
> 4583-trunk-less-radical-v4.txt, 4583-trunk-less-radical-v5.txt,
> 4583-trunk-less-radical-v6.txt, 4583-trunk-radical.txt,
> 4583-trunk-radical_v2.txt, 4583-trunk-v3.txt, 4583.txt, 4583-v2.txt,
> 4583-v3.txt, 4583-v4.txt
>
>
> Currently Increment and Append operations do not work with RWCC and hence a
> client could see the results of multiple such operation mixed in the same
> Get/Scan.
> The semantics might be a bit more interesting here as upsert adds and removes
> to and from the memstore.
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