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How to synchronize TreeMap?

TreeMap implementation is not synchronized.   If multiple threads access TreeMap and atleast one thread updates the TreeMap, it must be synchronized externally.  If no external synchronization, use 

 SortedMap m = Collections.synchronizedSortedMap(new TreeMap(...));

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Kafka Consumer Parallelism

Kafka Parallel Consumer Options: Key-level parallelism:  Multiple threads process the messages from a single partition in parallel while ma...