Are there established criteria for defining the role and distribution of partitions and brokers in the system?

In systems that use partitioning and brokers (such as Apache Kafka), the role and distribution of partitions and brokers are typically determined by configuration settings and load balancing algorithms.

Main criteria:

• Load distribution: partitions are distributed among brokers for resource utilization balance.
• Fault tolerance: partition replication across different brokers to ensure availability.
• Balancing: when brokers are added or removed, partitions are redistributed.

These criteria are implemented through built-in system mechanisms and configuration parameters, as well as through controllers that monitor the cluster's state.