Please review the patches

[Bhallamudi Venkata Siva Kamesh]

Hi Devs,
 I have submitted patches for the following issues, can someone  
please review them.
MAPREDUCE-4071
MAPREDUCE-4050
MAPREDUCE-4040
MAPREDUCE-4002
MAPREDUCE-3870
MAPREDUCE-2493
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Thanks&Regards,
Bh.V.S.Kamesh.