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Date: Thu, 12 Jul 2012 18:57:34 +0000 (UTC)
From: "Steve Hoffman (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
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Subject: [jira] [Commented] (HDFS-3647) Expose current xcievers count as
 metric
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    [ https://issues.apache.org/jira/browse/HDFS-3647?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13413072#comment-13413072 ] 

Steve Hoffman commented on HDFS-3647:
-------------------------------------

Yea, like I said, wasn't sure if this had already been implemented.

I'll open a CDH DISTRO jira asking for the back port, but as you point out, could be useful in the general 1.X sense.
                
> Expose current xcievers count as metric
> ---------------------------------------
>
>                 Key: HDFS-3647
>                 URL: https://issues.apache.org/jira/browse/HDFS-3647
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: data-node, performance
>    Affects Versions: 0.20.2
>            Reporter: Steve Hoffman
>
> Not sure if this is in a newer version of Hadoop, but in CDH3u3 it isn't there.
> There is a lot of mystery surrounding how large to set dfs.datanode.max.xcievers.  Most people say to just up it to 4096, but given that exceeding this will cause an HBase RegionServer shutdown (see Lars' blog post here: http://www.larsgeorge.com/2012/03/hadoop-hbase-and-xceivers.html), it would be nice if we could expose the current count via the built-in metrics framework (most likely under dfs).  In this way we could watch it to see if we have it set too high, too low, time to bump it up, etc.
> Thoughts?

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