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https://issues.apache.org/jira/browse/HBASE-10252?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13858778#comment-13858778
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Feng Honghua commented on HBASE-10252:
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also thanks [~yuzhih...@gmail.com] for the prompt response and review, :-)
> 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
> 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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