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From "Suresh Srinivas (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-3647) Backport HDFS-2868 (Add number of active transfer threads to the DataNode status) to branch-1
Date Fri, 20 Jul 2012 23:49:35 GMT

    [ https://issues.apache.org/jira/browse/HDFS-3647?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13419693#comment-13419693

Suresh Srinivas commented on HDFS-3647:

BTW removing performance from the component - add it if you disagree.
> Backport HDFS-2868 (Add number of active transfer threads to the DataNode status) to
> ---------------------------------------------------------------------------------------------
>                 Key: HDFS-3647
>                 URL: https://issues.apache.org/jira/browse/HDFS-3647
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: data-node
>    Affects Versions: 0.20.2
>            Reporter: Steve Hoffman
>            Assignee: Harsh J
>             Fix For: 1.2.0
>         Attachments: HDFS-3647.patch, Screen Shot 2012-07-14 at 12.41.07 AM.png
> 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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