如何调用Ignite服务的所有已部署实例

Question

I have a certain service that is deployed in a cluster group in an Apache Ignite cluster. Cluster group size is 3. Total Number of service instances = 3. Instance per node = 1.

No whenever I want to execute the service, I can get an handle to once of the service instances on a node only.

But I want to execute the service on all the nodes. ie. on all three nodes.

What is the correct way to do this?

Answer 1

According to the documentation , you can use node singletons to achieve that level of distribution for a service:

Node Singleton

You can deploy a per-node singleton service. Ignite will guarantee that there is always one instance of the service running on each node. Whenever new nodes are started within the cluster group, Ignite will automatically deploy one instance of the service on every new node.

The comment refers to the following code snippets:

IgniteServices svcs = ignite.services();
//The .services() method has an overload, to which you can pass a cluster group
svcs.deployNodeSingleton("myNodeSingleton", new MyService());

And its alternative:

svcs.deployMultiple("myNodeSingleton", new MyService(), 0, 1);

I supposed that by "service instance", you meant "a running instance of the same service implementation".

Answer 2

It sounds like you're looking for remote service invocation. If that's the case, you can use service proxy: https://apacheignite.readme.io/docs/service-example#service-proxy