Github user kiszk commented on the issue:
https://github.com/apache/spark/pull/18723
Thank you. 1. makes sense since memory is allocated by 2x at that point.
While I looked at a [PR](https://github.com/netty/netty/pull/464) for
netty, I cannot understand why 16 was used.
I have another question to understand why it happens. Does this OOM occurs
when any OpenBlocks message are received. Or, any specific scenario (e.g.
receive a large message, a lot of multiple messages, or so on.)
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