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What are your thoughts on SBE vs Cap'n Proto. I don't know much about serialization libraries, but was thinking about looking into these both soon. Since you are using Aeron, I thought you would have looked into SBE( since developer being same for both) and not decided to go with it.

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SBE is better if you don't have (much) in the way of message format evolution and you intend to read each message in full.

Cap'n Proto has a way better compatibility story, and there's no need to read the entire message just to read a particular part.

SBE is very good for its intended use case: high-frequency trading with tiny, but tons, of small messages. Cap'n Proto is better for use as a stable (but evolvable) message format between systems (e.g. RPCs), or for on-disk storage if you've got a database (like LMDB) that doesn't force you to copy read-only data.

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