Github user XuMingmin commented on the issue:
https://github.com/apache/storm/pull/1919
thanks @revans2 , updated doc as advised.
Regarding to anchor, as ack() is called immediately when acker=0, though
it's not needed to track.
Originally, this ticket is focused to solve case 1. let's have a separated
one to address case 2 and case 3?
1). autocommit=true + ack=0
2). autocommit=true + ack>0 //ack track is running idle, to-be-confirm
3). autocommit=fale + ack=0 //ack immediately, similar as case 1,
to-be-confirm
4). autocommit=false + ack>0
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