StreamFile.doGet(..) uses an additional RPC to get file length
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Key: HDFS-1303
URL: https://issues.apache.org/jira/browse/HDFS-1303
Project: Hadoop HDFS
Issue Type: Improvement
Components: data-node
Reporter: Tsz Wo (Nicholas), SZE
{code}
//StreamFile.doGet(..)
long fileLen = dfs.getFileInfo(filename).getLen();
FSInputStream in = dfs.open(filename);
{code}
In the codes above, t is unnecessary to call getFileInfo(..), which is an
additional RPC to namenode. The file length can be obtained from the input
stream after open(..).
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