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From "Allen Wittenauer (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-4412) hadoop dfs -find feature
Date Wed, 06 May 2009 21:17:30 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-4412?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12706594#action_12706594
] 

Allen Wittenauer commented on HADOOP-4412:
------------------------------------------

It would be good to get some traction on this old issue.  It is becoming more and more prevalent
that ops teams need to be able to do operations on the whole of the file system (such as quota
reporting, and find).  While tools such as the offline image viewer are nice, some tasks really
do require relatively real time updates. There are also the issues about handing out the image
file from a security and practicality perspective.

> hadoop dfs -find feature
> ------------------------
>
>                 Key: HADOOP-4412
>                 URL: https://issues.apache.org/jira/browse/HADOOP-4412
>             Project: Hadoop Core
>          Issue Type: New Feature
>          Components: dfs
>            Reporter: Marco Nicosia
>
> Both sysadmins and users make frequent use of the unix 'find' command, but Hadoop has
no correlate. Without this, users are writing scripts which make heavy use of hadoop dfs -lsr,
and implementing find one-offs. I think hdfs -lsr is somewhat taxing on the NameNode, and
a really slow experience on the client side. Possibly an in-NameNode find operation would
be only a bit more taxing on the NameNode, but significantly faster from the client's point
of view?
> The minimum set of options I can think of which would make a Hadoop find command generally
useful is (in priority order):
> * -type (file or directory, for now)
> * -atime/-ctime-mtime (... and -creationtime?) (both + and - arguments)
> * -print0 (for piping to xargs -0)
> * -depth
> * -owner/-group (and -nouser/-nogroup)
> * -name (allowing for shell pattern, or even regex?)
> * -perm
> * -size
> One possible special case, but could possibly be really cool if it ran from within the
NameNode:
> * -delete
> The "hadoop dfs -lsr | hadoop dfs -rm" cycle is really, really slow.
> Lower priority, some people do use operators, mostly to execute -or searches such as:
> * find / \(-nouser -or -nogroup\)
> Finally, I thought I'd include a link to the [Posix spec for find|http://www.opengroup.org/onlinepubs/009695399/utilities/find.html]

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