Xeli commented on issue #6594: [FLINK-9311] [pubsub] Added PubSub source connector with support for checkpointing (ATLEAST_ONCE) URL: https://github.com/apache/flink/pull/6594#issuecomment-488354670 I've spoken with @haf through email and it seems the low acknowledge rate is related to the checkpoint frequency. The actual throughput of messages is fine.
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