Increasing the number of partition causes new messages keys to get hashed differently, and breaks the guarantee "same keys goes to the same partition". Kafka logs are immutable and the previous messages are not re-shuffled.

Since Confluent 5.4.0, Avro 1.9.1 is used. Since default value was added to enum complex type , the schema resolution changed from:
(<1.9.1) if both are enums:** if the writer's symbol is not present in the reader's enum, then an error is signalled. **(>=1.9.1) if both are enums:
if the writer's symbol is not present in the reader's enum and the reader has a default value, then that value is used, otherwise an error is signalled.

ACLs are stored in Zookeeper node /kafka-acls/ by default.

metadata is stored in and built from the KSQL command topic. Each KSQL server has its own in-memory version of the metastore.

Explanation:
* Table# Product, Customers
* Stream# Orders_Placed, Shipment_Of_Orders
* Tablesrepresent slowly changing,reference data- e.g., customer profiles, product info.
* Streamsrepresentreal-time event data- e.g., orders placed, shipments processed.
FromKafka Streams Documentation:
"Use KTable for reference datasets, and KStream for event-based processing such as orders or logs." Reference:Kafka Streams API Concepts