Hello, I remember a discussion rose upon performance issues on messages and that kryo serializer helped a lot.
Please read this: http://www.chrisstucchio.com/blog/2011/mapwritable_sometimes_a_performance_hog.html From a custom test I did, I was sending some messages with MapWritable as a container, Text as key and ArrayWritable (with integers inside) as a value. Hama was reporting 20MB of traffic. When I wrote my own Map (that implements Writable interface) I reduced the amount from 20MB to 1.5MB.. Cheers, Anastasios
