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From "Andrew Purtell (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-10252) Don't write back to WAL/memstore when Increment amount is zero (mostly for query rather than update intention)
Date Wed, 12 Feb 2014 21:38:20 GMT

    [ https://issues.apache.org/jira/browse/HBASE-10252?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13899609#comment-13899609
] 

Andrew Purtell commented on HBASE-10252:
----------------------------------------

Sounds good [~saint.ack@gmail.com]

> Don't write back to WAL/memstore when Increment amount is zero (mostly for query rather
than update intention)
> --------------------------------------------------------------------------------------------------------------
>
>                 Key: HBASE-10252
>                 URL: https://issues.apache.org/jira/browse/HBASE-10252
>             Project: HBase
>          Issue Type: Improvement
>          Components: regionserver
>            Reporter: Feng Honghua
>            Assignee: Feng Honghua
>             Fix For: 0.98.0, 0.99.0
>
>         Attachments: HBASE-10252-trunk-v0.patch, HBASE-10252-trunk-v1.patch
>
>
> When user calls Increment by providing amount=0, we don't write the original value to
WAL or memstore : adding 0 yields a 'new' value just with the same value as the original one.
> 1. user provides 0 amount for query rather than for update, this fix is ok; this intention
is the most possible case;
> 2. user provides 0 amount for an update, this fix is also ok : no need to touch back-end
value if that value isn't changed;
> 3. either case we both return correct value, and keep subsequent query results correct
: if the 0 amount Increment is the first update, the query is the same for retrieving a 0
value or retrieving nothing;



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