[jira] [Updated] (HADOOP-8989) hadoop dfs -find feature

["Jonathan Allen (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HADOOP-8989?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jonathan Allen updated HADOOP-8989:
-----------------------------------
    Attachment: HADOOP-8989.patch

Documentation changed to include "hdfs dfs -find" in the usage (I agree with Daryn that this is probably wrong but it's consistent with the rest of the documentation so should probably be a new issue to tidy it all up).

Documentation and help command updated to mention default path and expression.

CLI tests added to relative paths and default path.

> hadoop dfs -find feature
> ------------------------
>
>                 Key: HADOOP-8989
>                 URL: https://issues.apache.org/jira/browse/HADOOP-8989
>             Project: Hadoop Common
>          Issue Type: New Feature
>            Reporter: Marco Nicosia
>            Assignee: Jonathan Allen
>         Attachments: HADOOP-8989.patch, HADOOP-8989.patch, HADOOP-8989.patch, HADOOP-8989.patch, HADOOP-8989.patch, HADOOP-8989.patch, HADOOP-8989.patch, HADOOP-8989.patch, HADOOP-8989.patch, HADOOP-8989.patch, HADOOP-8989.patch, HADOOP-8989.patch, HADOOP-8989.patch, HADOOP-8989.patch, HADOOP-8989.patch, HADOOP-8989.patch, HADOOP-8989.patch, HADOOP-8989.patch, HADOOP-8989.patch, HADOOP-8989.patch, HADOOP-8989.patch, HADOOP-8989.patch
>
>
> 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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