Under-replicated partition
An under-replicated partition is a partition whose available replicas do not currently satisfy its configured replication requirement.
Kafka for Architects
An under-replicated partition is a Kafka partition whose available replicas do not currently satisfy its configured replication requirements.
- How it is used
- Uses replication health as an operational indicator for monitoring, broker decommissioning, and failure recovery.
- How deep it goes
- Explains the condition, monitoring significance, broker-failure behavior, leader-election trade-offs, and recovery through replica catch-up.
- Examples
- Uses broker removal, failed-broker failover, replica catch-up, and under-replicated-partition monitoring as concrete operational examples.
- What you can do after
- Diagnose replication health, plan safer broker removal, interpret failover behavior, and distinguish consistency from availability trade-offs.
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Apache Kafka in Action
An under-replicated partition is a Kafka partition that currently has fewer replicas than its configured replication requirement.
- How it is used
- Uses partition replica and ISR state to monitor Kafka reliability and debug broker or data-movement problems.
- How deep it goes
- Explains replica and ISR differences through broker failure and recovery, but defers detailed rules for ISR membership and leader eligibility.
- Examples
- Demonstrates a three-broker products.prices.changelog.replication-3 topic before failure, during Broker 3 downtime, and after recovery.
- What you can do after
- Diagnose with kafka-topics.sh, distinguish insufficient replication from insufficient ISRs, and verify recovery after a broker returns.
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Related concepts
- monitoringused by · Monitoring is the ongoing observation and measurement of a system’s behavior, state, or operational signals to assess its condition and detect changes or problems.
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