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https://issues.apache.org/jira/browse/HBASE-4583?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13126224#comment-13126224
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Jonathan Gray commented on HBASE-4583:
--------------------------------------
We likely won't be able to do in-place modifications or direct KV removal from
MemStore. A simple way would be to also introduce a delete marker that removes
the previous value, but the marker will have the rwcc of the new edit, so
you'll have the right consistency.
This will lead to a build up of unnecessary KVs in the MemStore. Periodically
cleaning that up would be possible but unnecessarily complex I think.
Another option would be to remove the previous KVs after you roll rwcc forward
and release the row lock, before dropping the region-level lock. Should
definitely be possible. Will obviously require a remangling of upsert but it's
kinda dirty anyways.
> 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
> Fix For: 0.94.0
>
>
> 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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