Few questions
"CompletableFuture<Position> asyncMigrate();"
Does this method only change the status of the managed ledger?
"message ManagedLedgerInfo {
// Flag to check if topic is terminated and migrated to different cluster
optional bool migrated = 4;
}"
This flag then is only changed to true when it has finished migration: i.e.
no new messages were written, all existing consumers finished reading all
messages and disconnected and the topic can now be deleted?
"Broker sends topic migration message to client so, producer/consumer at
client side can handle redirection accordingly"
For producers, the message will be sent the moment the status of the topic
has changed, so all messages from there on will be written to the new
cluster?
For consumers, the message will be sent when there are no more messages to
read?
On Tue, Jul 12, 2022 at 8:23 PM Rajan Dhabalia <rdhaba...@apache.org> wrote:
> 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
>
