Github user sryza commented on the pull request:
https://github.com/apache/spark/pull/1056#issuecomment-49805158
I ran some tests using SizeEstimator and the sizes seem pretty reasonable
to me.
A heartbeat with no tasks running is 232 bytes.
A heartbeat with two tasks running touching no blocks updated is 528 bytes.
A heartbeat with two tasks running each updating a block is 1112 bytes.
So if we go with a rough assumption of 150 bytes per task and 250 bytes per
block touched, a heartbeat with 32 tasks each touching 100 blocks would be
804,800 bytes, well under 10MB.
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