[Issue 5969] prevent redelivery of acked batch message at the client api#5990

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zzzming wants to merge 4 commits intoapache:masterfrom zzzming:issue5969

+396

Commits on Jan 4, 2020

prevent redelivery of acked batch message at client api
zzzming
committed

Commits on Jan 6, 2020

Commits on Jan 7, 2020

use BitSet to manage batch acked tracker
zzzming
committed