[jira] [Commented] (HADOOP-7352) Contracts of LocalFileSystem and DistributedFileSystem should require FileSystem::listStatus throw IOException not return null upon access error

["John Zhuge (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HADOOP-7352?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15463372#comment-15463372 ] 

John Zhuge commented on HADOOP-7352:
------------------------------------

Hi [~mattf],

I have been working on patches for HADOOP-13191 which seems like a duplicate of this JIRA. Do you mind if I take over this JIRA and merge the two together?

Cc. [~xiaochen].

Thanks,
John Zhuge

> Contracts of LocalFileSystem and DistributedFileSystem should require FileSystem::listStatus throw IOException not return null upon access error
> ------------------------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: HADOOP-7352
>                 URL: https://issues.apache.org/jira/browse/HADOOP-7352
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: fs, fs/s3
>            Reporter: Matt Foley
>            Assignee: Matt Foley
>
> In HADOOP-6201 and HDFS-538 it was agreed that FileSystem::listStatus should throw FileNotFoundException instead of returning null, when the target directory did not exist.
> However, in LocalFileSystem implementation today, FileSystem::listStatus still may return null, when the target directory exists but does not grant read permission.  This causes NPE in many callers, for all the reasons cited in HADOOP-6201 and HDFS-538.  See HADOOP-7327 and its linked issues for examples.



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