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From "John George (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-7771) NPE when running hdfs dfs -copyToLocal, -get etc
Date Wed, 26 Oct 2011 20:07:32 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-7771?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13136298#comment-13136298

John George commented on HADOOP-7771:

If the javadoc is true, I think should be:
{{if (!exists || !stat.isDirectory())}}
The purpose here is to ensure that destination is a directory and not a file. So previously
when we checked for 
if (!stat.isDirectory())
all we were trying to do was to ensure that the destination is a directory. The issue is that
{{stat}} could be null and so all that the check {{exist}} does is to ensure that {{stat}}
is not null before we even check if it is directory or not! Hence, I believe the check {{if
(exists && !stat.isDirectory())}} is the right check.

// if the destination is a directory, make target a child path,
// else use the destination as-is
-    if (dst.exists && dst.stat.isDirectory()) {
Here, (previously) the check for destination succeeded only if the 'dst' already existed.
With the new code, it ensures that we detect that the destination is a directory even in cases
where the destination does not exist. The logic does not change at all. Am I missing something

Can you elaborate on what you mean by "The use of isDstDir appears wrong and is duplication
of most of the prior logic. "? I would definitely like to reuse the logic if it already exists.
Could you give me a cleared idea as to what you mean?
> NPE when running hdfs dfs -copyToLocal, -get etc
> ------------------------------------------------
>                 Key: HADOOP-7771
>                 URL: https://issues.apache.org/jira/browse/HADOOP-7771
>             Project: Hadoop Common
>          Issue Type: Bug
>    Affects Versions: 0.23.0, 0.24.0
>            Reporter: John George
>            Assignee: John George
>            Priority: Blocker
>         Attachments: HADOOP-7771.patch
> NPE when running hdfs dfs -copyToLocal if the destination directory does not exist. The
behavior in branch-0.20-security is to create the directory and copy/get the contents from

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