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From "Harsh J (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-3645) Improve the way we do detection of a busy DN in the cluster, when choosing it for a block write
Date Thu, 12 Jul 2012 10:54:35 GMT
Harsh J created HDFS-3645:
-----------------------------

             Summary: Improve the way we do detection of a busy DN in the cluster, when choosing
it for a block write
                 Key: HDFS-3645
                 URL: https://issues.apache.org/jira/browse/HDFS-3645
             Project: Hadoop HDFS
          Issue Type: Improvement
          Components: name-node
    Affects Versions: 2.0.0-alpha
            Reporter: Harsh J
            Priority: Minor


Right now, I think we do too naive a computation for detecting if a chosen DN target is busy
by itself. We currently do {{node.getXceiverCount() > (2.0 * avgLoad)}}.

We should improve on this computation with a more realistic measure of if a DN is really busy
by itself or not (rather than checking against cluster average, where there's a good chance
the value can be wrong to compare with, for some cases)

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