[jira] [Created] (HBASE-25744) Change default of `hbase.normalizer.merge.min_region_size.mb` to `0`

["Nick Dimiduk (Jira)" <ji...@apache.org>]

Nick Dimiduk created HBASE-25744:
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             Summary: Change default of `hbase.normalizer.merge.min_region_size.mb` to `0`
                 Key: HBASE-25744
                 URL: https://issues.apache.org/jira/browse/HBASE-25744
             Project: HBase
          Issue Type: Improvement
          Components: master, Normalizer
    Affects Versions: 3.0.0-alpha-1, 2.5.0
            Reporter: Nick Dimiduk
            Assignee: Nick Dimiduk


The current default value is {{1}}, which means normalizer will leave regions of 0-1mb size hanging around. We should set this down to {{0}} so that these small regions go away by default. As I recall, the value was set as it is in order to prevent the normalizer from merging up regions immediately after an operator creates a pre-split table. IMHO, this use case is more than covered by these other configurations with their default values:
* {{hbase.normalizer.min.region.count=3}}
* {{hbase.normalizer.merge.min_region_age.days=3}}

For details, see
* http://hbase.apache.org/devapidocs/org/apache/hadoop/hbase/master/normalizer/package-summary.html#package.description
* http://hbase.apache.org/devapidocs/org/apache/hadoop/hbase/master/normalizer/SimpleRegionNormalizer.html



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