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From "dhruba borthakur (JIRA)" <j...@apache.org>
Subject [jira] Created: (HADOOP-922) Optimize smalls reads and seeks
Date Wed, 24 Jan 2007 00:13:49 GMT
Optimize smalls reads and seeks

                 Key: HADOOP-922
                 URL: https://issues.apache.org/jira/browse/HADOOP-922
             Project: Hadoop
          Issue Type: Bug
          Components: dfs
    Affects Versions: 0.10.1
            Reporter: dhruba borthakur

A seek on a DFSInputStream causes causes the next read to re-open the socket connection to
the datanode and fetch the remainder of the block all over again. This is not optimal.

A small read followed by a small positive seek could re-utilize the data already fetched from
the datanode as part of the previous read. 

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