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From "Gregory Chanan (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-4583) Integrate RWCC with Append and Increment operations
Date Mon, 29 Oct 2012 21:38:12 GMT

    [ https://issues.apache.org/jira/browse/HBASE-4583?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13486390#comment-13486390
] 

Gregory Chanan commented on HBASE-4583:
---------------------------------------

I agree with your comments about making a common code path for the read/update operations
and in there we could decide if we want to do upserts each time.

The upsert argument is complicated because it's really a question of the read workload as
much as the write workload, but we have to decide at write-time w/o much information (at least
now as we don't collect statistics or anything).  Off the top of my head I could see upserts
being more useful for increments than puts, since increments are only holding numerical values
(so old version x is probably just the current version minus the usual increment amount times
x).  Puts might have information you'd actually want to look at (job titles, times of last
submitted help-desk tickets,etc).  This is very hand-wavy though.

So, I think I'd just keep the upsert functionality for now and make it MVCC aware.  We can
revisit if/when we unify the implementations.
                
> 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: 0.94.3, 0.96.0
>
>         Attachments: 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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