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https://issues.apache.org/jira/browse/HBASE-3434?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12980779#action_12980779
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Jonathan Gray commented on HBASE-3434:
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I think it remains to be seen exactly where features implemented via 
coprocessors will live.  Certainly there will be some open source home for 
them, I just think there's some aversion to shipping with and managing a big 
set of contribs.

> ability to increment a counter without reading original value from storage
> --------------------------------------------------------------------------
>
>                 Key: HBASE-3434
>                 URL: https://issues.apache.org/jira/browse/HBASE-3434
>             Project: HBase
>          Issue Type: Improvement
>          Components: client, regionserver
>            Reporter: dhruba borthakur
>            Assignee: dhruba borthakur
>
> There are a bunch of applications that do read-modify-write operations on 
> HBase constructs, e.g  a counter; The counter value has to be read in from 
> hdfs before it can be incremented.  We have an application where the number 
> of increments on a counter far outnumbers the number of times the counter is 
> used or read. For these type of applications, it will be very beneficial to 
> not have to read in the counter from disk before it can be incremented.

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