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• It's a compacted topic.
• It's a partitioned topic (i.e. has more than one partitions). Order is retained within a single partition, but global order is not required. 
• It's a topic that is being fully read by every worker during startup.
• Every worker listens to updates and is able to read new messages written to this topic.
  
• Records are keyed.
• Older workers can skip messages that don't understand in this topic. 
• Json encoding is used for keys and values. 

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