[jira] [Updated] (HBASE-27532) Add block bytes scanned metrics

["Bryan Beaudreault (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HBASE-27532?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Bryan Beaudreault updated HBASE-27532:
--------------------------------------
    Fix Version/s: 2.6.0
                   3.0.0-beta-1
     Release Note: Adds blockBytesScannedCount metrics for the regionserver, table, and operations in JMX. Adds a countOfBlockBytesScanned to ScanMetrics.
       Resolution: Fixed
           Status: Resolved  (was: Patch Available)

Apparently, I forgot to close this. It was merged to master/branch-3/branch-2

> 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
>              Labels: patch-available
>             Fix For: 2.6.0, 3.0.0-beta-1
>
>
> 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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