Github user jinxing64 commented on the issue:
https://github.com/apache/spark/pull/18388
@tgravescs
As in the screenshot, we have tons of `ChunkOutboundBuffer$Entry`. Yes we
are using `transferTo`. Netty will put the `Entry`(containing reference to the
`MessageWithHeader`) into `ChannelOutboundBuffer`, then consumer will ship the
data onto network. We are running OOM because of too many
`ChunkOutboundBuffer$Entry`, as you can see 3GB almost.
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