Don't re-join when consumption has stopped #1571
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We're seeing an issue where consumers are erroneously rebalancing even after we try to shut them down during deploys. Below are some debug logs. I've tested this branch with my consumers and verified that they no longer try to participate in the re-balance (instead correctly leaving the group) if they detect a rebalance while shutting down so that the deploy can continue.
I'm not sure if this should be a flag that consumers can specify, but I don't know why you'd want your consumers to re-join a group if they're in the process of exiting.