THIS IS A TEST INSTANCE. ALL YOUR CHANGES WILL BE LOST!!!!
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When the client is on the latest version but the broker is old, the client shall still see INVALID_PRODUCER_EPOCH from transactional responses. This error should still be treated as fatal exception, and we don't need to check for broker version explicitly since new transaction coordinator doesn't reply with this error code anymore to new client. The new client would translate this as PRODUCER_FENCED when transiting to fatal error state.
Interaction With Older Clients
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