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Posted to hdfs-dev@hadoop.apache.org by "Greg Connor (JIRA)" <ji...@apache.org> on 2010/10/22 23:50:21 UTC
[jira] Created: (HDFS-1475) Want a -d flag in hadoop dfs -ls : Do
not expand directories
Want a -d flag in hadoop dfs -ls : Do not expand directories
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Key: HDFS-1475
URL: https://issues.apache.org/jira/browse/HDFS-1475
Project: Hadoop HDFS
Issue Type: Improvement
Components: hdfs client
Affects Versions: 0.20.1
Environment: any
Reporter: Greg Connor
Priority: Minor
I would really love it if dfs -ls had a -d flag, like unix ls -d, which would list the directories matching the name or pattern but *not* their contents.
Current behavior is to expand every matching dir and list its contents, which is awkward if I just want to see the matching dirs themselves (and their permissions). Worse, if a directory exists but is empty, -ls simply returns no output at all, which is unhelpful.
So far we have used some ugly workarounds to this in various scripts, such as
-ls /path/to |grep dir # wasteful, and problematic if "dir" is a substring of the path
-stat /path/to/dir "Exists" # stat has no way to get back the full path, sadly
-count /path/to/dir # works but is probably overkill.
Really there is no reliable replacement for ls -d -- the above hacks will work but only for certain isolated contexts. (I'm not a java programmer, or else I would probably submit a patch for this, or make my own jar file to do this since I need it a lot.)
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