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From "Andrew Wang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-5228) The RemoteIterator returned by DistributedFileSystem.listFiles(..) may throw NPE
Date Thu, 19 Sep 2013 20:09:55 GMT

    [ https://issues.apache.org/jira/browse/HDFS-5228?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13772237#comment-13772237
] 

Andrew Wang commented on HDFS-5228:
-----------------------------------

We have extensive symlink tests checked in as part of HADOOP-8040, so it's unfair to say that
it's not well tested. We've also been testing and fixing things upstream for the last few
months; I think some number of bugs like this are unavoidable as symlinks was a pretty big
change that required touching basically all the client API code.

As to fixing this particular issue, it'd be great to get it done in a timely fashion for the
2.1.1 release. I'd be happy to rework Nicholas' v1 patch myself if that would help. Chris,
thanks for going through DFS to check the other call sites, much appreciated.
                
> The RemoteIterator returned by DistributedFileSystem.listFiles(..) may throw NPE
> --------------------------------------------------------------------------------
>
>                 Key: HDFS-5228
>                 URL: https://issues.apache.org/jira/browse/HDFS-5228
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: hdfs-client
>    Affects Versions: 2.1.0-beta
>            Reporter: Tsz Wo (Nicholas), SZE
>            Assignee: Tsz Wo (Nicholas), SZE
>            Priority: Blocker
>         Attachments: h5228_20130919.patch, h5228_20130919_test.patch
>
>
> Get a RemoteIterator from DistributedFileSystem.listFiles(..) with a relative path. 
Then, it will result a NullPointerException when calling hasNext() from the RemoteIterator.
> This bug was discovered by Arnaud:
> http://hortonworks.com/community/forums/topic/new-bug-in-hdfs-listfiles-method/

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