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From "Hairong Kuang (JIRA)" <j...@apache.org>
Subject [jira] Issue Comment Edited: (HADOOP-5588) hadoop commands seem extremely slow in 0.20 branch
Date Fri, 27 Mar 2009 17:04:51 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-5588?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12689759#action_12689759
] 

Hairong Kuang edited comment on HADOOP-5588 at 3/27/09 10:02 AM:
-----------------------------------------------------------------

A suspect is HADOOP-3497 which introduced a listing call on the parent directory no matter
the path contains globs or not in globStatus. One of our users calls "dfs -get" on many small
files under one large directory. It has the same effect of calling dfs -ls many times on the
large directory, thus causing NN to do lots of gc and making it less responsive.

      was (Author: hairong):
    A suspect is HADOOP-3497 which introduced a listing call on the parent directory no matter
the path contains globs or not in globStatus. One of our users calls "dfs -get" on many small
files under one dir. It has the same effect of calling dfs -ls many times on a large directory,
thus causing NN to do lots of gc and making it less responsive.
  
> hadoop commands seem extremely slow in 0.20 branch
> --------------------------------------------------
>
>                 Key: HADOOP-5588
>                 URL: https://issues.apache.org/jira/browse/HADOOP-5588
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: dfs, fs
>    Affects Versions: 0.20.0
>         Environment: 0.20-branch and trunk
>            Reporter: Koji Noguchi
>            Assignee: Hairong Kuang
>            Priority: Blocker
>             Fix For: 0.20.0
>
>
> hadoop dfs get, rm, -mkdir- ,cp, mv, ls, etc   mydir/fileA mydir/fileB mydir/fileC ...
> seem to be very slow in 0.20 branch. 
>  

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