Symptoms
The standard Kafka producer (kafka-console-producer.sh) is unable to send messages and fails with the following timeout error:
org.apache.kafka.common.errors.TimeoutException
Causes
This situation occurs if the producer is invoked without supplying the required security credentials. In this case, the producer fails with the following error:
Error when sending message to topic <topicname> with key: null, value: <n> bytes
Resolving the problem
Create a properties file with the following content:
security.protocol=SASL_SSL
ssl.protocol=TLSv1.2
ssl.truststore.location=<certs.jks_file_location>
ssl.truststore.password=<truststore_password>
sasl.mechanism=PLAIN
sasl.jaas.config=org.apache.kafka.common.security.plain.PlainLoginModule required username="token" password="<api_key>";
Replace <certs.jks_file_location> with the location of a trust store file containing the server certificate (for example, certs.jks), <truststore_password> with the password for the trust store and <api_key> with an API key able to access the IBM Event Streams deployment.
When running the kafka-console-producer.sh command, include the --producer.config <properties_file> option, replacing <properties_file> with the name of the property file and the path to it. For example:
kafka-console-producer.sh --broker-list <brokerIP>:<bootstrapPort> --topic <topic> --producer.config <properties_file>