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https://issues.apache.org/jira/browse/HBASE-11876?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Andrew Purtell reopened HBASE-11876:
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The trunk change passed precommit but the 0.98 version requires an addendum to
fix a failing test, see
https://builds.apache.org/job/HBase-0.98/493/testReport/org.apache.hadoop.hbase.regionserver/TestRegionServerMetrics/testScanNext/
> RegionScanner.nextRaw(...) should not update metrics
> ----------------------------------------------------
>
> Key: HBASE-11876
> URL: https://issues.apache.org/jira/browse/HBASE-11876
> Project: HBase
> Issue Type: Bug
> Affects Versions: 0.98.6
> Reporter: Lars Hofhansl
> Assignee: Andrew Purtell
> Fix For: 0.99.0, 2.0.0, 0.98.6
>
> Attachments: HBASE-11876-0.98.patch, HBASE-11876.patch,
> HBASE-11876.patch
>
>
> I added the RegionScanner.nextRaw(...) to allow "smart" client to avoid some
> of the default work that HBase is doing, such as {start|stop}RegionOperation
> and synchronized(scanner) for each row.
> Metrics should follow the same approach. Collecting them per row is expensive
> and a caller should have the option to collect those later or to avoid
> collecting them completely.
> We can also save some cycles in RSRcpServices.scan(...) if we updated the
> metric only once/batch instead of each row.
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