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What happens when I partition data by key and then later on add a new partition to the topic in Kafka?
Will there be any change to the existing record? And how will the future data be partitioned?
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Partitioning of existing data doesn't change when new partitions are added to a particular topic. Kafka will not attempt to re-distribute existing records and this modification will only have effect on new records. Note that by default, Kafka partitions data using
hash(key) % noOfPartitionsin order to ensure that records with the same key are added to the same partition. Data with different key will be added to partitions in a round-robin fashion.