THIS IS A TEST INSTANCE. ALL YOUR CHANGES WILL BE LOST!!!!
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As discussed in KIP-43 an alternative way is to provide a plug-able SASL. But this implementation is bound to SASL implementation only. Authentication users supply must comply with SASL. This KIP provides higher level of abstraction as it is security protocol agnostic and up to users how they want to implement it. This KIP can certainly coexist with KIP-43 which is more focus on SASL mechanism extension.