Kafka Topic InvalidReplicationAssignmentException encountered when configuring Kafka Topic.

The replication assignment is invalid, possibly due to incorrect broker IDs or partition assignments.

Understanding Apache Kafka

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 is designed to handle real-time data feeds and is often used to build real-time streaming data pipelines and applications that adapt to the data streams.

Identifying the Symptom

When working with Kafka, you might encounter an error message like InvalidReplicationAssignmentException. This error typically arises during the configuration or modification of a Kafka Topic, indicating that the replication assignment is invalid.

What You Observe

Developers may see this error in the Kafka logs or when executing commands to create or alter topics. The error message is usually accompanied by a description stating that the replication assignment is invalid.

Delving into the Issue

The InvalidReplicationAssignmentException is thrown when the replication assignment for a Kafka Topic does not meet the expected criteria. This can happen if the broker IDs specified in the assignment do not exist, or if the partition assignments are not correctly configured.

Common Causes

Incorrect broker IDs in the replication assignment.
Non-existent partitions or brokers.
Misconfigured replication factor that exceeds the number of available brokers.

Steps to Resolve the Issue

To resolve this issue, follow these steps:

Step 1: Verify Broker IDs

Ensure that the broker IDs specified in the replication assignment are correct and that the brokers are up and running. You can list the available brokers using the following command:

bin/kafka-broker-api-versions.sh --bootstrap-server <broker-host>:<port>

Replace <broker-host> and <port> with your broker's host and port.

Step 2: Check Partition Assignments

Ensure that the partition assignments are valid. Each partition should be assigned to a valid broker. You can describe the topic to see the current partition assignments:

bin/kafka-topics.sh --describe --topic <topic-name> --bootstrap-server <broker-host>:<port>

Verify that each partition is correctly assigned to existing brokers.

Step 3: Adjust Replication Factor

If the replication factor is set higher than the number of available brokers, reduce it to match the number of brokers. You can update the topic configuration using:

bin/kafka-topics.sh --alter --topic <topic-name> --partitions <num-partitions> --replication-factor <num-replicas> --bootstrap-server <broker-host>:<port>

Additional Resources

For more detailed information on Kafka topic configuration, you can refer to the official Kafka documentation. Additionally, the Confluent blog offers insights and best practices for managing Kafka clusters.

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Kafka Topic UnsupportedSaslMechanismException

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Kafka Topic SaslAuthenticationException

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Kafka Topic InvalidRequestException

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Kafka Topic An unknown server error occurred.

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Kafka Topic TopicAuthorizationException

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Kafka Topic InvalidCommitOffsetSizeException

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Kafka Topic CoordinatorNotAvailableException

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Kafka Topic TransactionAbortedException

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Kafka Topic NetworkException

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Kafka Topic ReplicaNotAvailableException

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Kafka Topic BrokerNotAvailableException

A broker is not available, possibly due to a crash or network partition.

Kafka Topic InvalidTopicException encountered when creating or accessing a Kafka topic.

The topic name is invalid, possibly due to illegal characters or length.

Kafka Topic AuthorizationException

The client is not authorized to access the specified topic.

Kafka Topic RecordTooLargeException

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Kafka Topic RequestTimedOutException

A request to the broker timed out due to network latency or broker overload.

Kafka Topic CorruptRecordException

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Kafka Topic InvalidReplicationFactorException

The replication factor is larger than the number of available brokers.

Kafka Topic UnknownTopicOrPartitionException

The specified topic or partition does not exist.

Kafka Topic LeaderNotAvailableException

The leader for a partition is not available, possibly due to broker failure or network issues.

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