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https://issues.apache.org/jira/browse/HBASE-2188?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12830693#action_12830693
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ryan rawson commented on HBASE-2188:
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for what it's worth, my previous testing in 0.20 indicated a single cell can
take upwards of 2b ICV calls/day. The actual contention is fairly low. We
should weigh the implementation complexity against using a sharded counter
(which you'd need for multi-DC counters anyways) to achieve truly extreme
counter performance.
> 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
> Fix For: 0.21.0
>
>
> 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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