Behavioral Changes in Apache Kafka

Learn about the change in certain functionality of Kafka that has resulted in a change in behavior from the previously released version to this version of Cloudera Runtime.

Summary:

The default TLS protocol when using Java 11 or later is updated to TLS 1.3. TLS 1.2 remains the default for earlier Java versions. For more information, see KIP-573.

Previous behavior:

The default TLS protocol used was TLS 1.2.

New behavior:

The default TLS protocol when using Java 11 or later is TLS 1.3.

Summary:

The client.dns.lookup client property is now set to use_all_dns_ips by default. With this option set, clients attempt to connect to the broker using all possible IP addresses of a hostname. This option reduces connection failure rates and is better suited for cloud and containerized environments where a single hostname might resolve to multiple IP addresses. For more information, see KIP-602.

Previous behavior:

The default value of the client.dns.lookup client property was set to default.

New behavior:

The default value of the client.dns.lookup property is set to use_all_dns_ips.

Summary:

The default value for the following Kafka Connect properties is increased to 3:

• Offset Storage Topic Replication Factor(offset.storage.replication.factor)
• Configuration Storage Topic Replication Factor(config.storage.replication.factor))
• Status Storage Topic Replication Factor (status.storage.replication.factor)

Previous behavior:

The default value of the properties was set to 1.

New behavior:

The default value of the properties is set to 3.