Akira Ajisaka created HADOOP-17299:
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             Summary: DistCp should fail fast if the configuration is not valid
                 Key: HADOOP-17299
                 URL: https://issues.apache.org/jira/browse/HADOOP-17299
             Project: Hadoop Common
          Issue Type: Bug
          Components: tools/distcp
            Reporter: Akira Ajisaka


If the number of Map task is more than 200 and using dynamic option, DistCp 
always fails by DynamicInputFormat#validateNumChunksUsing. This failure is 
after building the src/dst paths, which takes more than 10 minutes if the 
directory is large (i.e. DistCp fails by configuration error after more than 10 
minutes).

I think DistCp should validate the configuration before building the src/dst 
paths and fail if the configuration is not valid.



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