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https://issues.apache.org/jira/browse/HBASE-25513?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Nick Dimiduk reopened HBASE-25513:
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Missed backport to branch-2.
> When the table is turned on normalize, the first region may not be merged
> even the size is 0
> --------------------------------------------------------------------------------------------
>
> Key: HBASE-25513
> URL: https://issues.apache.org/jira/browse/HBASE-25513
> Project: HBase
> Issue Type: Bug
> Components: Normalizer
> Affects Versions: 3.0.0-alpha-1, 2.4.1
> Reporter: Baiqiang Zhao
> Assignee: Baiqiang Zhao
> Priority: Major
> Fix For: 3.0.0-alpha-1, 2.4.2
>
>
> Suppose a table has 8 regions, the sizes are [0, 10, 1, 0, 9, 0, 12, 0], the
> average region size is 4, and split is disabled.
> The current Normalizer can only get three merge plans (use size to represent
> region):
> [1, 0], [9, 0],[12, 0]
> It can not merge the first region, even it's size is 0.
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