[PROTON-1829] adjust fallback sizing for internal buffers

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: proton-j-0.27.0
• Component/s: proton-j
• Assignee: Robbie Gemmell
• Reporter: Robbie Gemmell
• Created: 13/Apr/18 16:53
• Updated: 23/Apr/18 08:50
• Resolved: 13/Apr/18 18:38

Description

Some of the frame parsing and transport impl bases internal buffers on the size of the transports max frame size. If no max frame size is set (the default), then fallback sizes of 4KB are used. Given how the engine works and the potentially large frames from not having a max set these aren't great values and can exacerbate some inefficiencies elsewhere. Proton-c starts its equivalents at 16KB, we should match that.