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Posted to common-issues@hadoop.apache.org by "Hudson (JIRA)" <ji...@apache.org> on 2010/04/06 03:20:30 UTC
[jira] Commented: (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:comment-tabpanel&focusedCommentId=12853647#action_12853647 ]
Hudson commented on HADOOP-6569:
--------------------------------
Integrated in Hdfs-Patch-h2.grid.sp2.yahoo.net #146 (See [http://hudson.zones.apache.org/hudson/job/Hdfs-Patch-h2.grid.sp2.yahoo.net/146/])
> 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, 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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