[
https://issues.apache.org/jira/browse/HBASE-24583?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Nick Dimiduk updated HBASE-24583:
---------------------------------
Fix Version/s: 3.0.0-alpha-1
> 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
>
>
> 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.
--
This message was sent by Atlassian Jira
(v8.3.4#803005)
