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Feng Honghua commented on HBASE-10252: -------------------------------------- Sounds good [~stack] :-) > 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; -- This message was sent by Atlassian JIRA (v6.1.5#6160)