Kafka Topic InvalidReplicationFactorException

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

Understanding Kafka and Its Purpose

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, providing a robust and scalable solution for managing data streams.

Identifying the Symptom: InvalidReplicationFactorException

When working with Kafka, you might encounter the InvalidReplicationFactorException. This error typically occurs when attempting to create a topic with a replication factor that exceeds the number of available brokers in the Kafka cluster. The replication factor determines how many copies of the data are maintained across different brokers to ensure reliability and fault tolerance.

Observed Error Message

The error message might look like this:

InvalidReplicationFactorException: Replication factor: 3 larger than available brokers: 2

Explaining the Issue

The InvalidReplicationFactorException is thrown because Kafka cannot fulfill the request to replicate the topic data across the specified number of brokers. This is a critical configuration issue that needs to be addressed to ensure data redundancy and reliability.

Why This Happens

This issue arises when the replication factor specified during topic creation is greater than the number of brokers currently available in the Kafka cluster. For example, if you have a replication factor of 3 but only 2 brokers, Kafka cannot replicate the data as requested.

Steps to Fix the InvalidReplicationFactorException

To resolve this issue, you have two primary options: reduce the replication factor or increase the number of brokers in your Kafka cluster.

Option 1: Reduce the Replication Factor

Identify the current number of brokers in your cluster. You can use the following command to list all brokers:

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

Adjust the replication factor to a number equal to or less than the number of brokers. For example, if you have 2 brokers, set the replication factor to 2 or 1.
Use the following command to create the topic with the adjusted replication factor:

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

Option 2: Add More Brokers

Scale your Kafka cluster by adding more broker nodes. Ensure that the new brokers are properly configured and connected to the existing cluster.
Verify the new brokers are recognized by the cluster using the broker listing command:

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

Once the new brokers are added, you can proceed with creating the topic with the desired replication factor.

Additional Resources

For more information on Kafka topic configuration and management, you can refer to the official Kafka Documentation. Additionally, the Kafka Quickstart Guide provides a comprehensive overview of setting up and managing a Kafka cluster.

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Kafka Topic InvalidRequiredAcksException

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Kafka Topic InvalidPrincipalTypeException

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Kafka Topic UnsupportedForMessageFormatException

The operation is unsupported for the current message format.

Kafka Topic DelegationTokenExpiredException

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Kafka Topic DelegationTokenNotFoundException

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Kafka Topic ConcurrentTransactionsException

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

Kafka Topic UnsupportedSaslMechanismException

The SASL mechanism is not supported by the broker.

Kafka Topic SaslAuthenticationException

SASL authentication failed due to incorrect credentials.

Kafka Topic InvalidRequestException

The request is invalid, possibly due to incorrect parameters.

Kafka Topic An unknown server error occurred.

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Kafka Topic StaleBrokerEpochException

The broker epoch is stale, possibly due to a metadata update.

Kafka Topic QuotaExceededException

The client has exceeded its quota for a resource.

Kafka Topic TopicAuthorizationException

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The producer epoch is invalid, possibly due to a producer restart.

Kafka Topic InvalidCommitOffsetSizeException

The commit offset size is invalid.

Kafka Topic RebalanceInProgressException

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Kafka Topic InconsistentGroupProtocolException

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Kafka Topic UnsupportedVersionException

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Kafka Topic InvalidTimestampException

A record has an invalid timestamp.

Kafka Topic GroupAuthorizationException

The client is not authorized to access the consumer group.

Kafka Topic InvalidFetchSizeException encountered when consuming messages from Kafka Topic.

The fetch size is set to an invalid value, either too large or too small.

Kafka Topic CoordinatorNotAvailableException

The group coordinator is not available, possibly due to broker issues.

Kafka Topic TransactionAbortedException

A transaction was aborted, possibly due to a timeout or producer failure.

Kafka Topic NetworkException

A network error occurred while communicating with the broker.

Kafka Topic ProducerFencedException

A transactional producer was fenced off due to a new producer with the same transactional ID.

Kafka Topic Invalid configuration detected in Kafka Topic setup.

A configuration parameter is invalid or missing.

Kafka Topic ReplicaNotAvailableException

A replica for a partition is not available.

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

A record exceeds the maximum allowable size.

Kafka Topic RequestTimedOutException

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

Kafka Topic CorruptRecordException

A record in the topic is corrupted and cannot be deserialized.

Kafka Topic TopicExistsException

An attempt was made to create a topic that already exists.

Kafka Topic NotEnoughReplicasException

The number of in-sync replicas is less than the required minimum.

Kafka Topic OffsetOutOfRangeException

The consumer is trying to fetch data at an offset that is not available.

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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