Victoria Xia created KAFKA-14491:
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             Summary: Introduce Versioned Key-Value Stores to Kafka Streams
                 Key: KAFKA-14491
                 URL: https://issues.apache.org/jira/browse/KAFKA-14491
             Project: Kafka
          Issue Type: Improvement
            Reporter: Victoria Xia
            Assignee: Victoria Xia


The key-value state stores used by Kafka Streams today maintain only the latest 
value associated with each key. In order to support applications which require 
access to older record versions, Kafka Streams should have versioned state 
stores. Versioned state stores are similar to key-value stores except they can 
store multiple record versions for a single key. An example use case for 
versioned key-value stores is in providing proper temporal join semantics for 
stream-tables joins with regards to out-of-order data.

See KIP for more: 
https://cwiki.apache.org/confluence/display/KAFKA/KIP-889%3A+Versioned+State+Stores



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