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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
Patch updated following initial review.
Use of static blocks minimised (though unfortunately still necessary in some
places).
Command.processPaths wasn't able to recurse through symbolic links; I've
updated it to include a isPathRecursable extension method (basic implementation
is just isDirectory but Find extends it to check symlinks).
Rewriting the use of processPaths showed up some problems with the
implementation of symbolic link following. This has now been fixed.
Other review comments covered in previous comment.
> 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
>
>
> 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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