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https://issues.apache.org/jira/browse/HADOOP-1961?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12530887
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Raghu Angadi commented on HADOOP-1961:
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[A comment|https://issues.apache.org/jira/browse/HADOOP-1292#action_12506677]
in HADOOP-1292 says :
{quote}
3. I am unable to understand the behaviour of "another" file in
FsShell.copyToLocal. Will discuss this with you.
If renaming tmp to dst failed, tmp is renamed to another file since tmp will be
deleted on exit. The error message would tell the user that src is copied to
"another" successfully but cannot be renamed to dst.
{quote}
I am not sure about the above comment either. When rename() fails wouldn't that
be just another case of failure to copy? Once we use same filesystem as the
intended destination, rename() won't fail. And if it does fail, we could just
treat it as any other failure.
> -get, -copyToLocal fail when single filename is passed
> -------------------------------------------------------
>
> Key: HADOOP-1961
> URL: https://issues.apache.org/jira/browse/HADOOP-1961
> Project: Hadoop
> Issue Type: Bug
> Components: dfs
> Affects Versions: 0.14.1
> Reporter: Koji Noguchi
> Assignee: Raghu Angadi
> Priority: Blocker
> Fix For: 0.14.2
>
>
> In 0.14.1 and in trunk, when I try
> % hadoop dfs -get /user/knoguchi/aaa aaa
> get: Failed to rename tmp file to local destination "aaa". Remote source
> file "/user/knoguchi/aaa" is saved to "/tmp/_copyToLocal_aaa30478".
> This works.
> % hadoop dfs -get /user/knoguchi/aaa ./aaa
> or
> % hadoop dfs -get /user/knoguchi/aaa /home/knoguchi/aaa
> My guess. With change in HADOOP-1292, it now creates a tmp file when
> -copyToLocal.
> When destination path is passed without any directory, tmp file is created
> under '/tmp'. Otherwise, it uses the same directory as the destination path.
> In Java API for File.renameTo,
> http://java.sun.com/javase/6/docs/api/java/io/File.html#renameTo(java.io.File)
> it says
> " The rename operation might not be able to move a file from one filesystem
> to another",
> so renameTo call from /tmp/_tmpfile to /home/knoguchi can fail.
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