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From "Matt Foley (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-7352) Contracts of LocalFileSystem and DistributedFileSystem should require FileSystem::listStatus throw IOException not return null upon access error
Date Fri, 03 Jun 2011 01:06:47 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-7352?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13043163#comment-13043163
] 

Matt Foley commented on HADOOP-7352:
------------------------------------

@Daryn - thanks, I'll use that where appropriate.

@Bharath - agreed, the exception will always be IOException or one of its subclasses; IOException
where there is no detailed info available or no better subclass defined.

> 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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