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https://issues.apache.org/jira/browse/HBASE-11854?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14118928#comment-14118928
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Vladimir Rodionov commented on HBASE-11854:
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The *MetricsRegion.updateScanNext* overhead is significant only when multiple
scanners run over the same region. It is close to 20-25%. This is specific use
case but, anyway, the patch is coming.
> MetricsRegion.updateScanNext takes 20% of overall RegionScannerImpl.nextRaw
> call
> --------------------------------------------------------------------------------
>
> Key: HBASE-11854
> URL: https://issues.apache.org/jira/browse/HBASE-11854
> Project: HBase
> Issue Type: Bug
> Components: metrics, Performance, Scanners
> Affects Versions: 0.98.6
> Reporter: Vladimir Rodionov
> Assignee: Vladimir Rodionov
> Fix For: 0.99.0, 2.0.0, 0.98.7
>
>
> From our internal profiling we were surprised by amount of time spent in this
> call. Further investigation is needed.
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