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From "Todd Lipcon (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, 13 Jul 2012 21:00:47 GMT

    [ https://issues.apache.org/jira/browse/HDFS-3647?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13414052#comment-13414052
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Todd Lipcon commented on HDFS-3647:
-----------------------------------

+1 on the backport, thx Harsh.
                
> Backport HDFS-2868 (Add number of active transfer threads to the DataNode status) to
branch-1
> ---------------------------------------------------------------------------------------------
>
>                 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
>            Assignee: Harsh J
>         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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