Optimize smalls reads and seeks
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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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