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https://issues.apache.org/jira/browse/HBASE-3767?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13018982#comment-13018982
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Ted Yu commented on HBASE-3767:
-------------------------------

We can set core pool size to be the number of available processors and set max 
pool size to be (large) multiple of the number of available processors.
ThreadPoolExecutor is able to dynamically shrink thread count when appropriate.

> Cache the number of RS in HTable
> --------------------------------
>
>                 Key: HBASE-3767
>                 URL: https://issues.apache.org/jira/browse/HBASE-3767
>             Project: HBase
>          Issue Type: Improvement
>    Affects Versions: 0.90.2
>            Reporter: Jean-Daniel Cryans
>             Fix For: 0.90.3
>
>
> When creating a new HTable we have to query ZK to learn about the number of 
> region servers in the cluster. That is done for every single one of them, I 
> think instead we should do it once per JVM and then reuse that number for all 
> the others.

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