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Both events are fired by Netty framework , with a handle to the ChannelBuffer , and the expectation is that client will process the bytes in the buffer in some manner.
Are there any specific usage/scenarios where one is preferred over the other ?
You should checkout the FrameDecoder javadocs. In short you want to use the FrameDecoder if you need to “buffer” data until a Frame was received. The FrameDecoder will take care of it so other handlers in the pipeline (after it) will only receive a full frame.