Hi, We have created PIP-184 which helps users to perform cluster migration with Apache Pulsar. Cluster migration or Blue-Green cluster deployment is one of the proven solutions to migrate live traffic from one cluster to another. One of the examples is applications running on Kubernetes sometimes require a Kubernetes cluster upgrade which can cause downtime for the entire application during a Kubernetes cluster upgrade. Blue-green deployment is an application release model that gradually transfers user traffic from a previous version of an app or microservice to a nearly identical new release—both of which are running in production.
The old version can be called the blue environment while the new version can be known as the green environment. Once production traffic is fully transferred from blue to green, blue can standby in case of rollback or be pulled from production and updated to become the template upon which the next update is made. We need such capability in Apache pulsar to migrate live traffic from the blue cluster to the green cluster so, eventually, the entire traffic moves from the blue cluster to the green cluster without causing downtime for the topics. PIP: https://github.com/apache/pulsar/issues/16551 Thanks, Rajan
