Motivation:
Currently, using a MessageAggregator in the pipeline always results in the creation of an unpooled heap CompositeByteBuf. By using the ByteBufAllocator the CompositeByteBuf will use the implementation specified by the ByteBufAllocator.
Modifications:
Use the ChannelHandlerContext's ByteBufAllocator to create the CompositeByteBuf for message aggregation
Result:
The CompositeByteBuf is now configured based on the ByteBufAllocator's settings.
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