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Apache Kafka is a distributed event streaming platform used by thousands of companies for high-performance data pipelines, streaming analytics, data integration, and mission-critical applications. Kafka brokers are the heart of the Kafka cluster, responsible for maintaining the published data and serving clients.
For more information, visit the official Apache Kafka documentation.
The KafkaUnderReplicatedPartitions alert is triggered when some partitions have fewer replicas in sync than expected. This can lead to data loss if a broker fails, as there are not enough replicas to ensure data availability.
In a Kafka cluster, each partition is replicated across multiple brokers to ensure high availability and fault tolerance. The under-replicated partitions metric indicates the number of partitions that do not have the expected number of in-sync replicas (ISRs). This alert is critical as it signifies potential data loss risks.
For a deeper dive into Kafka replication, check out this Kafka replication guide.
First, check if any brokers are down or experiencing issues. Use the following command to list the brokers and their status:
bin/kafka-broker-api-versions.sh --bootstrap-server <broker-host>:9092
If any brokers are down, attempt to restart them and check the logs for any errors.
Network issues can cause replication delays. Ensure that all brokers can communicate with each other without latency issues. Use tools like ping
or traceroute
to diagnose network problems.
Replication can be resource-intensive. Ensure that brokers have sufficient CPU, memory, and disk resources. Monitor resource usage using tools like Grafana or Prometheus.
If the issue persists, consider adjusting the replication configuration. Increase the replication.factor
for critical topics to ensure higher availability. Use the following command to alter the topic configuration:
bin/kafka-topics.sh --alter --topic <topic-name> --partitions <number-of-partitions> --replication-factor <new-replication-factor> --zookeeper <zookeeper-host>:2181
Addressing the KafkaUnderReplicatedPartitions alert is crucial for maintaining data integrity and availability in your Kafka cluster. By following the steps outlined above, you can diagnose and resolve the underlying issues effectively.
For further reading, explore the Kafka Operations Guide.
(Perfect for DevOps & SREs)
(Perfect for DevOps & SREs)