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• GroupId must be non-empty.

• Either MemberId is must be non-empty or MemberEpoch is 0.

• MemberEpoch must be >= -2.

• InstanceId, if not null, must be non-empty.

• RebalanceTimeoutMs must be larger than zero in the first heartbeat request.

• ActiveTasks, StandbyTasks and WarmupTasks have to be disjoint sets

• Each element of ActiveTasks, StandbyTasks and WarmupTasks has to be a valid task ID in the topology initialized for the group ID.

• ActiveTasks, StandbyTasks and WarmupTasks have to be non-null and empty when joining (member epoch is 0)

• If MemberEpoch  is 0, Topology should be non-null. Otherwise, it should be null.

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