Hi,
I'm confused about slots communication in same taskmanager. Assume only one job which running on per-job cluster with parallalism = 6. Each taskmanager with 3 slot. There are 6 slot: slot 1-1, slot 1-2, slot 1-3, slot 2-1, slot 2-2 , slot 2-3 Assume the job has 'KeyBy' operator, thus, eash 'keyby' in each slot will distribute data into all downstream opeators in every slots. I know that Tasks in the same JVM share TCP connections (via multiplexing) and heartbeat messagesThat means: slot 1-1 , slot 1-2, slot 1-3 share TCP connections communicate with slot 2-1, slot 2-2, slot 2-3 My question is: how about communication type between slot 1-1 and slot 1-2? by thread-to-thread? or by network?