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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