Copying a file to local with Crc throws an exception
----------------------------------------------------

                 Key: HADOOP-5085
                 URL: https://issues.apache.org/jira/browse/HADOOP-5085
             Project: Hadoop Core
          Issue Type: Bug
          Components: fs
            Reporter: Hairong Kuang
             Fix For: 0.21.0


$ hadoop dfs -get -crc /user/aa/test.txt test.txt
get: org.apache.hadoop.dfs.DistributedFileSystem cannot be cast to
org.apache.hadoop.fs.ChecksumFileSystem

The problem seems to be caused by the line 251 in FsShell#copyToLocal:
{noformat}
250;      if (copyCrc) {
251:        ChecksumFileSystem csfs = (ChecksumFileSystem) srcFS;
               ...
             }
{noformat}

Copying crc files to local should not require the source file system to be 
ChecksumFileSystem. 


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