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From "Feng Honghua (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-10252) Don't write back to WAL/memstore when Increment amount is zero (mostly for query rather than update intention)
Date Sun, 29 Dec 2013 03:53:50 GMT
Feng Honghua created HBASE-10252:
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             Summary: 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


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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