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https://issues.apache.org/jira/browse/HADOOP-6569?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Hairong Kuang updated HADOOP-6569:
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Attachment: optimizeCat-yahoo2.patch
After much thinking back and forth, I eventually decided to change the
DistributedFileSystem#open as well. When the file to be open does not exist or
is a directory, open throws a FileNotFoundException instead of IOException. The
error message is changed from "cannot open a file" to be "File doesn't exist".
> FsShell#cat should avoid calling unecessary getFileStatus before opening a
> file to read
> ---------------------------------------------------------------------------------------
>
> 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
>
> Attachments: optimizeCat-yahoo.patch, optimizeCat-yahoo1.patch,
> optimizeCat-yahoo2.patch, optimizeCat.patch
>
>
> 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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