Hello guys,

When you enable ExternalShuffleService (spark-shuffle) in NodeManager,
there are no suggestions of increasing NM heap size in Spark docs or
anywhere else, shouldn't we include this in spark's documentation?

I have seen NM take a lot of memory 5+ gb with default 1g, and in case of
its GC pauses spark can become very slow when tasks are doing shuffle. I
don't think users are aware of NM becoming bottleneck.


Sincerely,
Artur Sukhenko
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Artur Sukhenko

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