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HashMap Vs HashTable

Hash table based implementation of the Map interface. This implementation provides all of the optional map operations, and permits null values and the null key. (The HashMap class is roughly equivalent toHashtable, except that it is unsynchronized and permits nulls.) This class makes no guarantees as to the order of the map; in particular, it does not guarantee that the order will remain constant over time.

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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...