FsShell#cat should avoid calling unecessary getFileStatus before opening a file
to read
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Key: HADOOP-6569
URL: https://issues.apache.org/jira/browse/HADOOP-6569
Project: Hadoop Common
Issue Type: Improvement
Components: fs
Reporter: Hairong Kuang
Assignee: Hairong Kuang
Fix For: 0.22.0
Since FileSystem#open throws a FileNotFoundException when the file to be read
does not exist, there is no need to check if the file is a directory or not
before open. In case of HDFS, this could reduce one getFileInfo RPC to NameNode.
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