Follower node
A follower node is a non-primary replica that receives replicated data or state from a leader and generally does not initiate leadership.
MongoDB 8.0 in Action, Third Edition
A secondary member is a replica set member that replicates data from the primary and can serve configured read operations.
- How it is used
- Positions a secondary as a data-replicating member that can serve configured reads while the primary accepts writes.
- How deep it goes
- Explains member states and asynchronous oplog application, then shows status and lag inspection without a failure-recovery procedure.
- Examples
- Shows a replica set with one primary and two secondaries, plus sample oplog entries and a replication-lag report.
- What you can do after
- Diagnose/debug with mongosh status and replication-info commands to identify secondary members and inspect their reported lag.
Read how MongoDB 8.0 in Action, Third Edition explains follower node →
Apache Kafka in Action
A Kafka partition follower is a broker that copies partition data from the leader for resilience and failover.
- How it is used
- Provides partition copies across brokers so a follower can take over if the leader fails.
- How deep it goes
- Explains replica counts, leader–follower traffic and ISR inspection, then connects follower fetching and lag to acknowledgments without detailing election internals.
- Examples
- Uses a three-broker price topic and kafka-topics.sh create and describe output to identify leaders and replicas.
- What you can do after
- Operate/configure it with kafka-topics.sh by choosing a feasible replication factor and inspecting partition replicas and ISR.
Kafka Streams in Action, Second Edition
A secondary node is a non-leader Schema Registry node that serves reads and forwards schema write requests to the primary node.
- How it is used
- Routes Schema Registry writes through the primary while distributing client read handling across secondary nodes.
- How deep it goes
- Explains the primary-secondary request flow, Kafka-backed schema storage, and response forwarding without detailing node-election mechanics.
- Examples
- Uses schema registration, schema updates, read requests, and architecture diagrams to trace follower behavior.
- What you can do after
- Operate Schema Registry clients with a clear model of forwarded writes and locally served reads.
Read how Kafka Streams in Action, Second Edition explains follower node →
Related concepts
- primary nodecontrasts with · A primary node is a designated authoritative or coordinating member of a distributed system, typically responsible for accepting operations or coordinating replicated state.
- availability grouppart of · An availability group is a SQL Server high-availability and disaster-recovery configuration that maintains synchronized database replicas.
- replicationused by · Replication is the creation or maintenance of multiple copies of data, state, or functionality across separate locations or components.
- read preferenceconfigured by · Read preference is a database-client policy specifying which replica roles or locations may serve read operations.
- clientkind of · A client is a person, organization, device, or software component that receives or uses a product, service, resource, or functionality provided by another entity.
These guides are generated from the text of Manning books by Manning's knowledge graph and link to the sections they draw on. The full books are available on liveBook and at manning.com.