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https://issues.apache.org/jira/browse/HBASE-2188?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jean-Daniel Cryans updated HBASE-2188:
--------------------------------------

         Priority: Minor  (was: Major)
    Fix Version/s:     (was: 0.21.0)

Setting this to minor priority and not for 0.21, let's revisit if we need to.

> Group ICVs waiting on row lock
> ------------------------------
>
>                 Key: HBASE-2188
>                 URL: https://issues.apache.org/jira/browse/HBASE-2188
>             Project: Hadoop HBase
>          Issue Type: Improvement
>            Reporter: Jean-Daniel Cryans
>            Priority: Minor
>
> In the same spirit as group commit down in HLog, incrementColumnValue should 
> be grouping all requests waiting on the row lock into one in HRegion. This 
> means that 10 clients waiting on the lock should be all summed up and then 
> applied only once.

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