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From "Binglin Chang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-9972) new APIs for listStatus and globStatus to deal with symlinks
Date Thu, 19 Sep 2013 03:46:02 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-9972?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13771565#comment-13771565
] 

Binglin Chang commented on HADOOP-9972:
---------------------------------------

bq. listStatus(Path, PathOption) doesn't like a core API, core API should be minimal, orthogonal,
and complete. listStatus(Path, PathOption) in the end still need readdir/getLinkStatus equivalent
to implement.
Sorry, getLinkStatus should be listLinkStatus

Another way of saying this is that readdir/listLinkStatus are already there(LocalFS need some
change, HDFS already have listStatus, FS not support symlink listStatus==listLinkStatus),
but for compatibility reason, we can use the name listStatus anymore, so just change it to
use another name.
                
> new APIs for listStatus and globStatus to deal with symlinks
> ------------------------------------------------------------
>
>                 Key: HADOOP-9972
>                 URL: https://issues.apache.org/jira/browse/HADOOP-9972
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: fs
>    Affects Versions: 2.1.1-beta
>            Reporter: Colin Patrick McCabe
>            Assignee: Colin Patrick McCabe
>
> Based on the discussion in HADOOP-9912, we need new APIs for FileSystem to deal with
symlinks.  The issue is that code has been written which is incompatible with the existence
of things which are not files or directories.  For example,
> there is a lot of code out there that looks at FileStatus#isFile, and
> if it returns false, assumes that what it is looking at is a
> directory.  In the case of a symlink, this assumption is incorrect.
> It seems reasonable to make the default behavior of {{FileSystem#listStatus}} and {{FileSystem#globStatus}}
be fully resolving symlinks, and ignoring dangling ones.  This will prevent incompatibility
with existing MR jobs and other HDFS users.  We should also add new versions of listStatus
and globStatus that allow new, symlink-aware code to deal with symlinks as symlinks.

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