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RpcCallHandler is dispatched on the IO thread #167

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The RpcCallHandler is not assigned a thread pool, which means only a single request can be handled concurrently. This is a show stopper for high throughput systems.

To process the request asynchronously, use the addAfter overload that takes an EventExecutorGroup:

https://netty.io/4.0/api/io/netty/channel/ChannelPipeline.html#addAfter-io.netty.util.concurrent.EventExecutorGroup-java.lang.String-java.lang.String-io.netty.channel.ChannelHandler-

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