msakho / infinispan-embedded-rolling-upgrade

Showcase for migration of embedded clusters using Hot Rod

Infinispan Embedded Rolling Upgrade

Info

Showcase for migration of embedded clusters using Hot Rod.

An embedded cluster with version DG 7.0 stores caches as POJOs, and has an embedded Hot Rod server that is used by a second cluster running 11.0.x to migrate data without downtime.

⚠️ Java 8 should be used to run the processes!

Build the project

mvn clean package

Running the source cluster

Start one of more nodes with:

cd source/
mvn exec:java

To avoid port conflict in successive nodes, use the offset JVM property, e.g.:

mvn clean install -Doffset=1000 exec:java

Running the target cluster and Migrate data

Start one or more nodes with:

cd destination/
mvn exec:java

To avoid port conflict, the JVM property offset can also be used, similarly to the source cluster. Once the destination is started, the data from the source cache are beeing migrated and will be outputed from the console.

Viewing migrated data

Since the destination cluster exposes a REST server, the data should be available in the destination cluster. Check with:

curl "http://localhost:8888/rest/v2/caches/cache?action=keys"

It's also possible to view a specific cache data with the following REST call:

curl  -H "Key-Content-Type: application/x-java-object; type=java.lang.Integer" "http://localhost:8888/rest/v2/caches/cache/1"