Due to a change in behavior introduced at Netty 4.1.111, an optimization that had been done to improve processing of large numbers of small messages led to problems. These 3 versions have disabled that optimization for versions of Netty equal to or greater than 4.1.111 allowing for gRPC Java to be used with those Netty versions.
If you are using Netty versions prior to 4.1.111 you will see no change from these patches.
Thanks,
Larry