Aikar 5b7c4a0281 Optimize Network Manager Closed channel handling and flushing ...

Adds Netty Channel Flush Consolidation to reduce the amount of flushing
This improves performanceo of netty event loop.

If a problem is encountered with this, you can disable it by adding the java flag:
  -DPaper.disableFlushConsolidate=true

Also avoids spamming closed channel exception by rechecking closed state in dispatch
and then catch exceptions and close if they fire.

This should resolve connections getting stuck spamming ChannelClosed in logs and
let them clean up and close correctly.

2020-06-20 04:37:17 -04:00

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