Cloudera Docs

Release notes

Learn about the new features, improvements, known and fixed issues, limitations, and unsupported features in this release of CSM Operator.

What's New

Learn about the new features and notable changes in this release of CSM Operator.

CSM Operator 1.0.0

This is the initial release of CSM Operator. This release of CSM Operator is based on Strimzi 0.40.0 and Kafka 3.7.0. See the following upstream resources for more information on these versions:

To learn more about CSM Operator and its typical deployment architecture, see Overview. For installation instructions, see Installation.

Known Issues

Learn about the known issues in this release of CSM Operator.

CSMDS-334: ZooKeeper pods are running but Kafka pods are not created
Under certain circumstances, ZooKeeper pods might not be able to form a quorum. In a case like this, the creation of the Kafka cluster gets stuck in a state where ZooKeeper pods are running, but Kafka pods are not created.
If you encounter this issue, at least one of the ZooKeeper pods logs a WARN entry similar to the following: 
2024-02-23 18:45:00,311 WARN Unexpected exception (org.apache.zookeeper.server.quorum.QuorumPeer) [QuorumPeer[myid=3](plain=127.0.0.1:12181)(secure=[0:0:0:0:0:0:0:0]:2181)]
java.lang.InterruptedException: Timeout while waiting for epoch from quorum
	at org.apache.zookeeper.server.quorum.Leader.getEpochToPropose(Leader.java:1443)
	at org.apache.zookeeper.server.quorum.Leader.lead(Leader.java:606)
	at org.apache.zookeeper.server.quorum.QuorumPeer.run(QuorumPeer.java:1552)

This is caused by a race condition issue in ZooKeeper. ZooKeeper is unable to recover from this state automatically.

Delete the ZooKeeper pods that are unable to form a quorum.
kubectl delete pod [***ZOOKEEPER POD***] -n [***NAMESPACE***]

The Cluster Operator automatically recreates the ZooKeeper pods that are deleted. The newly created ZooKeeper pods are less likely to encounter the issue.

Unsupported features

Learn what features are unsupported in this release of CSM Operator.

The following Strimzi features are unsupported in CSM Operator:

  • Kafka Connect
  • Kafka MirrorMaker
  • Kafka MirrorMaker 2
  • Kafka Bridge
  • Kafka cluster creation without using KafkaNodePool resources