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https://issues.apache.org/jira/browse/HBASE-27532?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Bryan Beaudreault reassigned HBASE-27532:
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Assignee: Bryan Beaudreault
> Add block bytes scanned metrics
> -------------------------------
>
> Key: HBASE-27532
> URL: https://issues.apache.org/jira/browse/HBASE-27532
> Project: HBase
> Issue Type: Improvement
> Reporter: Bryan Beaudreault
> Assignee: Bryan Beaudreault
> Priority: Major
>
> Initially in HBASE-14978, but more recently improved in HBASE-27558 and
> HBASE-27570, we now track the amount of block bytes scanned by read requests.
> Random read use-cases (which might read 1 small row from a 64kb block) and
> heavily filtered scans (which might scan many blocks in order to return a
> needle in a haystack row) can unknowingly cause RegionServers to do more work
> than a user expects. Now that we have block IO accounting, we should expose
> this to the user in the form of jmx metrics and ScanMetrics.
>
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