[jira] [Created] (HDFS-4848) copyFromLocal and renaming a file to ".snapshot" should output that ".snapshot" is a reserved name

[Stephen Chu (JIRA)]

Stephen Chu created HDFS-4848:
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             Summary: copyFromLocal and renaming a file to ".snapshot" should 
output that ".snapshot" is a reserved name
                 Key: HDFS-4848
                 URL: https://issues.apache.org/jira/browse/HDFS-4848
             Project: Hadoop HDFS
          Issue Type: Improvement
    Affects Versions: 3.0.0
            Reporter: Stephen Chu
            Priority: Trivial


Might be an unlikely scenario, but if users copyFromLocal a file/dir from local 
to HDFS and want the file/dir to be renamed to _.snapshot_, then they'll see an 
Input/output error  like the following:

{code}
schu-mbp:~ schu$ hdfs dfs -copyFromLocal testFile1 /tmp/.snapshot
copyFromLocal: rename `/tmp/.snapshot._COPYING_' to `/tmp/.snapshot': 
Input/output error
{code}

It'd be more clear if the error output was the usual _".snapshot" is a reserved 
name_ (this does show in the NN logs, though).

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