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Date: Thu, 27 Aug 2009 00:40:59 -0700 (PDT)
From: "dhruba borthakur (JIRA)" <jira@apache.org>
To: hdfs-dev@hadoop.apache.org
Subject: [jira] Created: (HDFS-575) DFSClient read performance can be
 improved by stagerring connection setup to datanode(s)
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DFSClient read performance can be improved by stagerring connection setup to datanode(s)
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                 Key: HDFS-575
                 URL: https://issues.apache.org/jira/browse/HDFS-575
             Project: Hadoop HDFS
          Issue Type: Improvement
          Components: hdfs client
            Reporter: dhruba borthakur


The DFS client opens a socket connection to a DN for the n-th block, fetches n-th block from that datanode and then opens socket connections to the datanode that contains the n+1th block. Sequential-reads might show performance improvements if the setting up of socket connections to the datanode containing the n+1th block can happen in parallel while the data for the nth block is being fetched. The amount of improvement, if any, has to be measured.

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