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Posted to common-issues@hadoop.apache.org by "Hairong Kuang (JIRA)" <ji...@apache.org> on 2010/03/02 00:12:05 UTC

[jira] Updated: (HADOOP-6569) FsShell#cat should avoid calling unecessary getFileStatus before opening a file to read

     [ https://issues.apache.org/jira/browse/HADOOP-6569?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Hairong Kuang updated HADOOP-6569:
----------------------------------

    Attachment: optimizeCat-yahoo1.patch

The change made to FsShell#cat makes the output of cat different when the src does not exist or is a directory. This patch made changes to testCLI configuration file to accommodate this output change. 

> 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.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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