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From "Lars Hofhansl (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-4583) Integrate RWCC with Append and Increment operations
Date Fri, 02 Nov 2012 23:24:13 GMT

    [ https://issues.apache.org/jira/browse/HBASE-4583?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13489834#comment-13489834

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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