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Date: Tue, 12 Apr 2011 05:23:05 +0000 (UTC)
From: "Ted Yu (JIRA)" <jira@apache.org>
To: issues@hbase.apache.org
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Subject: [jira] [Commented] (HBASE-3767) Cache the number of RS in HTable
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    [ https://issues.apache.org/jira/browse/HBASE-3767?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13018726#comment-13018726 ] 

Ted Yu commented on HBASE-3767:
-------------------------------

The number of region servers in the cluster is used in the following:
{code}
    int nrThreads = conf.getInt("hbase.htable.threads.max", getCurrentNrHRS());
...
    this.pool = new ThreadPoolExecutor(nrThreads, nrThreads,
{code}
Can we default the value for hbase.htable.threads.max using a multiple of the available processors ?

> 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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