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https://issues.apache.org/jira/browse/HBASE-27667?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Rajeshbabu Chintaguntla resolved HBASE-27667.
---------------------------------------------
    Fix Version/s:     (was: 2.6.0)
                       (was: 3.0.0-alpha-4)
                       (was: 2.5.5)
       Resolution: Won't Fix

As [~ndimiduk] mentioned at PR it would be better to not to check the 
storefiles count and size as a metric of considering presplit region. Hence 
closing as won't fix as there is no alternative meta data checks to find the 
presplit regions. Will reopen if any fix possible.

> Normalizer can skip picking presplit regions while preparing merge plans
> ------------------------------------------------------------------------
>
>                 Key: HBASE-27667
>                 URL: https://issues.apache.org/jira/browse/HBASE-27667
>             Project: HBase
>          Issue Type: Improvement
>          Components: Normalizer
>            Reporter: Rajeshbabu Chintaguntla
>            Assignee: Rajeshbabu Chintaguntla
>            Priority: Major
>
> Normalizer can be used to merge the regions which become emtpy post TTL 
> expiry.
> But it's picking the presplit regions as well. We can skip picking presplit 
> regions while preparing the merge plans by looking at the number of 
> storefiles along with size. Presplit regions have zero storefiles where as 
> the TTL expired regions have 1 storefile with zero size.



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