Github user StephanEwen commented on the pull request:
https://github.com/apache/flink/pull/888#issuecomment-128446267
The bloom filters are stored in subregions of Flink's memory segments, not
in any additional memory.
That is very nice (occupies no extra memory), but requires to go against
Flink's memory segments, rather than longs or byte arrays. Hence, the custom
implementation.
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