Kafka Topic InvalidReplicationFactorException

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

Kafka Topic InvalidReplicationFactorException

 ?

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

  1. 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>
  1. 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.
  2. 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

  1. Scale your Kafka cluster by adding more broker nodes. Ensure that the new brokers are properly configured and connected to the existing cluster.
  2. 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>
  1. 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.

Attached error: 
Kafka Topic InvalidReplicationFactorException
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Kafka Topic InvalidCleanupPolicyException
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Kafka Topic Invalid replication factor error when creating a Kafka topic.
The replication factor specified is not valid for the current Kafka cluster configuration.
Kafka Topic InvalidPartitionsException
The number of partitions is invalid.
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Kafka Topic InvalidPrincipalTypeException
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Kafka Topic UnsupportedForMessageFormatException
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Kafka Topic DelegationTokenExpiredException
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Kafka Topic DelegationTokenNotFoundException
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Kafka Topic ConcurrentTransactionsException
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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 QuotaExceededException
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Kafka Topic TopicAuthorizationException
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Kafka Topic GroupAuthorizationException
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Kafka Topic CoordinatorNotAvailableException
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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
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Kafka Topic Invalid configuration detected in Kafka Topic setup.
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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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