How To Fix - "No Resolvable Bootstrap Urls" Error in Kafka ?

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In this post, we will see How To Fix - "No Resolvable Bootstrap Urls" Error in Kafka.

Caused by: kafkashaded.org.apache.kafka.common.config.ConfigException: No resolvable bootstrap urls given in bootstrap.servers<!-- more -->

While using Kafka, you might observe the above error. It might ultimately result into the below error -

kafkashaded.org.apache.kafka.common.KafkaException: Failed to construct kafka consumer

Before you start checking or debugging the issue, collect all the Kafka Brokers details - IP Address, Hostname etc and keep them handy.  

Check 1 :

• First thing first - if you look at the error details, it says "No resolvable bootstrap urls given in bootstrap.servers". So it is a good idea to cross-check the bootstrap.servers values. Make sure the IP address defined in the bootstrap.servers is correct, accessible and running.

"bootstrap.servers", "<Ip\_Address>:9092"

• Check bootstrap.servers value set in the the consumer.properties file as well. It should be same as in the previous. (Just FYI..consumer.properties and producer.properties files are used for configuring a consumer or producer application).

kafka-console-consumer.sh --consumer.config ~/kafka/consumer.properties --topic TEST

 

Check 2 :

• Check the advertised.listeners details in config/server.properties file.
• Note that bootstrap.servers is used for the initial connection to the Kafka cluster. However after the initial connection is done, Kafka will return advertised.listeners info which is a list of IP_Addresses that can be used to connect to the Kafka Brokers. Hence it is very crucial that the correct details is set in the advertised.listeners based on the Kafka Cluster config.
• The clients use the advertised.listeners details to connect to the Kafka Brokers subsequently.
• Make sure you are using the right IP_Address details in the advertised.listeners field.
• In many cases, external IP should be used as the right IP_Address.

advertised.listeners=PLAINTEXT://<IP\_Address>:9092

 

Check 3 :

• If you are using Kafka in a Spark cluster, then all the worker nodes should be aware of the Kafka Brokers information.
• Update the Kafka Broker details (IP address\Hostname) in the /etc/hosts file in the worker nodes, edge node, driver node, master node as applicable in your cluster configuration.

 

Check 4 :

• If you are using or connecting Kafka from some other External Service or system which has it's own defined properties as part of the connector config, then make sure to identify the exact property that caters to define the Kafka Brokers.
• And subsequently use the Kafka Broker bootstrap.servers\advertised.listeners details in those fields as well.
• In case of Docker, check the docker-compose.yml  file. And cross-check the set name or value for "container_name" and Bootstrap_servers_config fields.

  Hope this helps to solve the error.  

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  How To Fix - "No Resolvable Bootstrap Urls" Error in Kafka ?  

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