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Compatibility, Deprecation, and Migration Plan

• This new change is an effort of reducing rebalances during consumer rolling restart. The change should be transparent on client sideThe UNKNOWN_MEMBER_ID handling.

Rejected Alternatives

In this pull request, we did an experimental approach to materialize member id on the instance local disk. This approach could reduce the rebalances as expected, but is very hacky and has few drawbacks:

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