Commits on Feb 25, 2023

1. avoid consuming receive buffers when blocked by queue …

   By disabling auto-read and triggering reads when a channel becomes active
   or when the previous read on a channel has completed, we avoid pulling bytes
   out of our TCP receive buffer prematurely, which allows the normal mechanisms
   of TCP back-pressure to work as expected.
   
   When auto-read enabled, an input experiencing back-pressure from the
   pipeline's queue would effectively avoid propagating that back-pressure
   by continuing to transfer bytes from the receive buffer into effectively
   unlimited direct memory buffers until it reached netty's memory allocation
   limit or an OOM was reached by allocating more memory than was available.
   
   It is likely that disabling auto-read will have some negative effect on
   throughput with the default-size receive buffers, and that we will also
   need to tune these or provide a way to make them user-tunable.

   

   yaauie committed Feb 25, 2023
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