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 ?