Github user squito commented on the issue:
https://github.com/apache/spark/pull/21811
> Does it make sense to release byteChannel at deallocate()?
you could, just to let GC kick in a *bit* earlier, but I don't think its
going to make a big difference. (Netty's ByteBufs must be since they may be
owned by netty's internal pools and never gc'ed)
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