Github user jinxing64 commented on the issue:
https://github.com/apache/spark/pull/18388
<img width="603" alt="2017-06-28 12 37 34"
src="https://user-images.githubusercontent.com/4058918/27620790-a0a27c8e-5bfe-11e7-8a78-5ebbf4839437.png";>
As the screenshot, there are tons of
`io.netty.channel.ChannelOutboundBuffer$Entry`. If I understand correctly,
messages are written to `ChannelOutboundBuffer` first then flushed to network.
If the message is sent successfully,
`io.netty.channel.ChannelOutboundBuffer$Entry` will be released(recycled). The
memory of messages are allocated by `PooledByteBufAllocator`. Thus we can have
a control by referring this metric.
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