[jira] [Resolved] (HBASE-24465) Normalizer should consider region max file size when planning merges

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

     [ https://issues.apache.org/jira/browse/HBASE-24465?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Nick Dimiduk resolved HBASE-24465.
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    Resolution: Not A Problem

I think this is this actually a problem. The total size of a generated merge action is limited to the average region size. If average region size exceeds max region file size, region servers will split their regions, thus driving down the average.

> Normalizer should consider region max file size when planning merges
> --------------------------------------------------------------------
>
>                 Key: HBASE-24465
>                 URL: https://issues.apache.org/jira/browse/HBASE-24465
>             Project: HBase
>          Issue Type: Improvement
>          Components: master, Normalizer
>            Reporter: Nick Dimiduk
>            Priority: Major
>
> When the normalizer plans its actions, it does not consider {{hbase.hregion.max.filesize}}. This means it could get into a merge/split loop in collaboration with the region server: the normalizer sees two regions are smaller than the table average, it merges them. The resulting region is larger that this max file size, so the region server splits them. Repeat.



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