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https://issues.apache.org/jira/browse/HADOOP-5588?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12689759#action_12689759
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Hairong Kuang edited comment on HADOOP-5588 at 3/27/09 10:02 AM:
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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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