in-memory optimization

[Robert Schwarzenberg]

Hello,

I have a question regarding the loop-awareness of Flink wrt invariant 
datasets.

Does Flink serialize the DataSet 'points' in line 85

https://github.com/apache/flink/blob/master/flink-examples/flink-examples-batch/src/main/scala/org/apache/flink/examples/scala/clustering/KMeans.scala 


each iteration or are there in-memory optimization procedures in place?

Thanks for your help!

Regards,
Robert