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From "Lars Hofhansl (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-4583) Integrate RWCC with Append and Increment operations
Date Wed, 07 Nov 2012 04:36:15 GMT

    [ https://issues.apache.org/jira/browse/HBASE-4583?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13492116#comment-13492116
] 

Lars Hofhansl commented on HBASE-4583:
--------------------------------------

Another thought... As I described above I can also make upsert VERSIONS aware, by also counting
the versions in upsert. That way even historical queries would be correct... Could be slow
if many version are to be retained.

There's also one other options: Use upsert if VERSIONS is set to 1 and use the normal Store.add
otherwise.

In both cases Omid type transaction engines could still work.

I'm going to take it as a given from now on that we want to keep the upsert logic as the default
option.

                
> 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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