Github user StephanEwen commented on the pull request:
https://github.com/apache/incubator-flink/pull/78#issuecomment-52229213
The example uses a fairly inefficient way to create the points; It creates
a list (serial data source) which also may easily become huge in the heap
spaces.
Why not use `env.generateSequence(from to)`. This function needs no memory
for the data source, and execures in parallel.
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