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https://issues.apache.org/jira/browse/HBASE-27532?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17705967#comment-17705967
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Hudson commented on HBASE-27532:
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Results for branch master
[build #806 on
builds.a.o|https://ci-hbase.apache.org/job/HBase%20Nightly/job/master/806/]:
(x) *{color:red}-1 overall{color}*
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details (if available):
(x) {color:red}-1 general checks{color}
-- For more information [see general
report|https://ci-hbase.apache.org/job/HBase%20Nightly/job/master/806/General_20Nightly_20Build_20Report/]
(x) {color:red}-1 jdk8 hadoop3 checks{color}
-- For more information [see jdk8 (hadoop3)
report|https://ci-hbase.apache.org/job/HBase%20Nightly/job/master/806/JDK8_20Nightly_20Build_20Report_20_28Hadoop3_29/]
(x) {color:red}-1 jdk11 hadoop3 checks{color}
-- For more information [see jdk11
report|https://ci-hbase.apache.org/job/HBase%20Nightly/job/master/806/JDK11_20Nightly_20Build_20Report_20_28Hadoop3_29/]
(/) {color:green}+1 source release artifact{color}
-- See build output for details.
(/) {color:green}+1 client integration test{color}
> 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
>
> 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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