jerrypeng commented on issue #2909: Add ack and fail to Streamlet API URL: https://github.com/apache/incubator-heron/issues/2909#issuecomment-392153800 @mjschmidt so one of the design choices we made for the streamlet API was to move away from the concept of spouts/bolts towards the concepts of sources and sinks to better support state and effectively once processing provided chandy/lamport style state snapshotting. Acking was more natural spout and bolt APIs where managed state by heron isn't available while not so much for the functional style APIs used in Streamlets Acking also doesn't gel well with the state implementation since state snapshotting is provided by chandy/lamport global snapshotting. Perhaps @srkukarni can also chime in.
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