Github user greghogan commented on the issue:
https://github.com/apache/flink/pull/4372
@fhueske I started running some benchmarks on HITS with each of the
combiners (sort, hash, none) and at small scales hash is fasted followed by
none with sort in last. None is somewhat faster than hash for very small
graphs. I've gotten stuck on scale 23 where the job is deadlocking on the first
iteration for all three types. Interestingly I also see the deadlock on my
laptop running from IntelliJ. I need to look more because I'm not seeing what
is releasing memory buffers when all operators are seemingly waiting on
acquiring a buffer from `LocalBufferPool`.
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