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From "Bharath Mundlapudi (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 Thu, 02 Jun 2011 20:49:47 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-7352?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13043037#comment-13043037
] 

Bharath Mundlapudi commented on HADOOP-7352:
--------------------------------------------

Throwing an IOException is reasonable when listStatus returns null. The reason for this null
case can be multiple things like file may not be present, permission issue, disk is bad, OS
decided to make file system readonly etc etc. Since at FileSystem level we may not know all
the causes for this so we should throw an IOException. Do you agree?

> 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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