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From "Harsh J (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-3647) Expose current xcievers count as metric
Date Thu, 12 Jul 2012 18:55:34 GMT

    [ https://issues.apache.org/jira/browse/HDFS-3647?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13413069#comment-13413069

Harsh J commented on HDFS-3647:

I believe I've already done this for Hadoop 0.23+ (Now 2.x), via HDFS-2868. Perhaps we can
backport that onto 1.x as well, for which we can re-purpose this JIRA.

For CDH requests though, this is the wrong place and the right open channel to use is https://issues.cloudera.org/browse/DISTRO
or its mailing lists.
> 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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