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From "Steve Hoffman (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-3647) Expose dfs.datanode.max.xcievers as metric
Date Thu, 12 Jul 2012 18:45:35 GMT
Steve Hoffman created HDFS-3647:

             Summary: Expose dfs.datanode.max.xcievers 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.


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