liuxiaolong created HADOOP-17256:
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             Summary: DistCp -update option will be invalid when distcp files 
from hdfs to S3
                 Key: HADOOP-17256
                 URL: https://issues.apache.org/jira/browse/HADOOP-17256
             Project: Hadoop Common
          Issue Type: Bug
          Components: tools/distcp
            Reporter: liuxiaolong


We use distcp with -update option to copy a dir from hdfs to S3. When we run 
distcp job once more, it will overwrite S3 dir directly, rather than skip the 
same files.
 
Test Case:
1. Run twice distcp cmd,  the modify time of S3 files will be modified
hadoop distcp -update /testA/ s3a://tiered-storage-bigdata-1251625956/testA/
 



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