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https://issues.apache.org/jira/browse/HBASE-24583?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17176761#comment-17176761
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Hudson commented on HBASE-24583:
--------------------------------
Results for branch branch-2
[build #6 on
builds.a.o|https://ci-hadoop.apache.org/job/HBase/job/HBase%20Nightly/job/branch-2/6/]:
(x) *{color:red}-1 overall{color}*
----
details (if available):
(/) {color:green}+1 general checks{color}
-- For more information [see general
report|https://ci-hadoop.apache.org/job/HBase/job/HBase%20Nightly/job/branch-2/6/General_20Nightly_20Build_20Report/]
(/) {color:green}+1 jdk8 hadoop2 checks{color}
-- For more information [see jdk8 (hadoop2)
report|https://ci-hadoop.apache.org/job/HBase/job/HBase%20Nightly/job/branch-2/6/JDK8_20Nightly_20Build_20Report_20_28Hadoop2_29/]
(/) {color:green}+1 jdk8 hadoop3 checks{color}
-- For more information [see jdk8 (hadoop3)
report|https://ci-hadoop.apache.org/job/HBase/job/HBase%20Nightly/job/branch-2/6/JDK8_20Nightly_20Build_20Report_20_28Hadoop3_29/]
(/) {color:green}+1 jdk11 hadoop3 checks{color}
-- For more information [see jdk11
report|https://ci-hadoop.apache.org/job/HBase/job/HBase%20Nightly/job/branch-2/6/JDK11_20Nightly_20Build_20Report_20_28Hadoop3_29/]
(/) {color:green}+1 source release artifact{color}
-- See build output for details.
(x) {color:red}-1 client integration test{color}
--Failed when running client tests on top of Hadoop 2. [see log for
details|https://ci-hadoop.apache.org/job/HBase/job/HBase%20Nightly/job/branch-2/6//artifact/output-integration/hadoop-2.log].
(note that this means we didn't run on Hadoop 3)
> Normalizer can't actually merge empty regions when neighbor is larger than
> average size
> ---------------------------------------------------------------------------------------
>
> Key: HBASE-24583
> URL: https://issues.apache.org/jira/browse/HBASE-24583
> Project: HBase
> Issue Type: Bug
> Components: master, Normalizer
> Affects Versions: 2.3.0
> Reporter: Nick Dimiduk
> Assignee: Nick Dimiduk
> Priority: Major
> Fix For: 3.0.0-alpha-1, 2.3.1, 2.4.0
>
>
> There are plenty of cases where empty regions can accumulate -- incorrect
> guessing at split points, old data is automatically expiring off, &c. The
> normalizer stubbornly refuses to handle this case, despite this being an
> original feature it was intended to support (HBASE-6613).
> Earlier discussion had concerns for a user pre-splitting a table and then the
> normalizer coming along and merging those splits away before they could be
> populated. Thus, right now, the default behavior via
> {{hbase.normalizer.merge.min_region_size.mb=1}} is to not split any region
> that's so small. Later, we added
> {{hbase.normalizer.merge.min_region_age.days=3}}, which prevents us from
> merging any region too young. So there's plenty of nobs for an operator to
> customize their behavior.
> But when I set {{hbase.normalizer.merge.min_region_size.mb=0}}, I still end
> up with stubborn regions that won't merge away. Looks like a large neighbor
> will prevent a merge from going through.
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