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CDH 5.7 MapReduce is 30% slower than 4.7


CDH 5.7 MapReduce is 30% slower than 4.7




In the last week we migrated our old CDH 4.7 cluster to the new 5.7


I have noth cluster running at the moment.


What i notice, is that CDH 5.7 is 30% slower executing MR job compared to the CDH 4.7


Same code, same dataset, same number of mchines , same hardware


Setup on both clusters

10 Datanodes, 10 NodeManager instances




Any tips how i can improve this ?


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