Github user JoshRosen commented on the pull request:
https://github.com/apache/spark/pull/2944#issuecomment-60859702
What if we had a 1000-node cluster, though, and kept the default heartbeat
interval of 10 seconds? In that case, we'd be sending a huge flood of data to
the driver, 99.9% of which end up being overwritten / discarded. From a
performance / stability perspective, it's probably better to fetch this
on-demand.
I'm going to see how long it takes to throw together a quick "actor in the
executor" prototype.
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