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HDFS >> mail # user >> distcp failed "Copy failed: ENOENT: No such file or directory"

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distcp failed "Copy failed: ENOENT: No such file or directory"
# sudo -u hdfs hadoop distcp hdfs:// hdfs://
13/09/06 15:34:11 INFO tools.DistCp: srcPaths=[hdfs://]
13/09/06 15:34:11 INFO tools.DistCp: destPath=hdfs://
13/09/06 15:34:12 WARN conf.Configuration: session.id is deprecated.
Instead, use dfs.metrics.session-id
13/09/06 15:34:12 INFO jvm.JvmMetrics: Initializing JVM Metrics with
processName=JobTracker, sessionId13/09/06 15:34:12 WARN conf.Configuration: slave.host.name is deprecated.
Instead, use dfs.datanode.hostname
With failures, global counters are inaccurate; consider running with -i
Copy failed: ENOENT: No such file or directory
        at org.apache.hadoop.io.nativeio.NativeIO.chmod(Native Method)
        at org.apache.hadoop.fs.FileSystem.mkdirs(FileSystem.java:579)
        at org.apache.hadoop.tools.DistCp.setup(DistCp.java:1038)
        at org.apache.hadoop.tools.DistCp.copy(DistCp.java:666)
        at org.apache.hadoop.tools.DistCp.run(DistCp.java:881)
        at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:70)
        at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:84)
        at org.apache.hadoop.tools.DistCp.main(DistCp.java:908)

the src and dest dir is all exist

# sudo -u hdfs hadoop fs -ls /alex
Found 3 items
drwxr-xr-x   - root supergroup          0 2013-08-16 10:14 /alex/mydump
drwxr-xr-x   - root supergroup          0 2013-08-28 10:48 /alex/tdump
drwxr-xr-x   - root supergroup          0 2013-08-28 10:54 /alex/tdump2
#  sudo -u hdfs hadoop fs -ls /benchmarks
Found 1 items
drwxr-xr-x   - hdfs hdfs          0 2013-08-23 17:02 /benchmarks/TestDFSIO