franz1981 edited a comment on issue #2845: ARTEMIS-2336 Use zero copy to replicate journal/page/large message file (AGAIN) URL: https://github.com/apache/activemq-artemis/pull/2845#issuecomment-535443555 @wy96f Good analysis :) Yep, so the simplest possible solution I see is to tune differently `highWaterMark` > 1 MB to allow the chunk writer queue to continue to be drained. Both ChunkedInput and FileRegions are missing (on Netty) a correct size estimation on ChannelOutboundBuffer and this would imply senders to push many of them in burst: what makes them behave differently is that FileRegion is getting backpressured only by TCP while ChunkedInputs start to getting backpressured by Netty itself *into* ChunkedWriterHandler, given that any read ByteBuf is being accounted into ChannelOutboundBuffer thus preventing subsequent pending writes to proceed due to the small high watermark limit (if compared to the chunk size).
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