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https://issues.apache.org/jira/browse/HBASE-12897?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14317047#comment-14317047
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Andrew Purtell commented on HBASE-12897:
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Hmm.. Maybe you didn't but I still like it. I will add a release note that this 
change drops the max memstore percentage from 90% to 80% of heap. 90% is crazy 
anyway. 

> Minimum memstore size is a percentage
> -------------------------------------
>
>                 Key: HBASE-12897
>                 URL: https://issues.apache.org/jira/browse/HBASE-12897
>             Project: HBase
>          Issue Type: Bug
>    Affects Versions: 2.0.0, 0.98.10, 1.1.0
>            Reporter: churro morales
>            Assignee: churro morales
>             Fix For: 1.0.0, 2.0.0, 1.1.0
>
>         Attachments: HBASE-12897.0.98.patch, HBASE-12897.patch
>
>
> We have a cluster which is optimized for random reads.  Thus we have a large 
> block cache and a small memstore.  Currently our heap is 20GB and we wanted 
> to configure the memstore to take 4% or 800MB.  Right now the minimum 
> memstore size is 5%.  What do you guys think about reducing the minimum size 
> to 1%?  Suppose we log a warning if the memstore is below 5% but allow it?
> What do you folks think? 



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