How deeply does Apache Kafka in Action cover migration?

Outlines upgrade stages, controller settings, replication, and a rollback point, while leaving detailed execution instructions to official documentation.

Migration

As explained in Apache Kafka in Action

A ZooKeeper-to-KRaft migration is the controlled transition of Kafka cluster metadata management from ZooKeeper to KRaft.

A ZooKeeper-to-KRaft migration moves Kafka cluster metadata management to KRaft. The transition can occur without downtime, but requires careful planning and a staged upgrade. section 7.3

Plan the transition in stages:

Upgrade the existing cluster to the latest Kafka version that still supports ZooKeeper. section 7.3
Provision dedicated KRaft controllers—typically three or five—with the same cluster ID, migration mode enabled, and ZooKeeper connection details. Configure the existing brokers for migration and provide the new controllers’ connection details. section 7.3
Let the controllers replicate metadata from ZooKeeper. Once the completion message appears, the ordinary brokers are still in ZooKeeper mode, and reverting to ZooKeeper is still possible at this point. section 7.3
Continue by migrating the ordinary brokers to KRaft, then upgrade Kafka to the latest version. Migration supports a dedicated KRaft-controller cluster; it does not reduce the number of machines operated. section 7.3

Completed migration of metadata from ZooKeeper to KRaft

Use the completion message as an operational checkpoint: it marks metadata replication, not the end of the broker transition. section 7.3

How Apache Kafka in Action covers it

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Related concepts

eltcontrasts with · ELT is a data-integration approach that extracts data, loads it into a target environment, and transforms it there.
RunPythonhas part · RunPython is a Django migration operation that executes supplied Python functions when migrating forward or backward.
data availabilityaddresses · Data availability is the extent to which required data exists and can be accessed for its intended uses when needed.
databaseuses · A database is an organized collection of persistent data managed by software for storage, retrieval, querying, and modification.
schemaconfigures · A data schema is a formal specification of the structure, fields, types, relationships, and constraints of data.

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