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dhruba borthakur commented on HBASE-4938:
-----------------------------------------
Todd, thanks for asking. We have some application code running inside the
regionserver. It atomically updates a row and maintains a count of the number
of entries inside that row. The reason it is part of the region server code is
because we need the 'count' updation to be atomic and performant
read-modify-write. The code to read the previous value of the 'count' will
invoke getScanner(scan, Long.Max_VALUE) so that it can read the most recent
value of 'count' (even if the previous 'count' update is still in the process
of getting committed).
> Create a HRegion.getScanner public method that allows reading from a
> specified readPoint
> ----------------------------------------------------------------------------------------
>
> Key: HBASE-4938
> URL: https://issues.apache.org/jira/browse/HBASE-4938
> Project: HBase
> Issue Type: Improvement
> Reporter: dhruba borthakur
> Assignee: dhruba borthakur
> Priority: Minor
>
> There is an existing api HRegion.getScanner(Scan) that allows scanning a
> table. My proposal is to extend it to HRegion.getScanner(Scan, long readPoint)
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