Server crash when ignite service is stopped on client node

[alex401401]

There is a cluster of 3 nodes. 1 server and 2 client nodes. The server is started with ignite.bat without parameters. The 2 client nodes are running as part of my dotnet applications. One (N1) runs ignite services and the other (N2) is a console application to control the services in the cluster. I.e. for starting, stopping and controlling the services.
When on N2 I give a command to start a service - services.DeployNodeSingleton("TestService", TestServiceImpl), everything is fine - the service is started on N1 and works. But when I give a command to stop the service - services.Cancel("TestService"), an exception occurs on the server and it crashes. At the same time TestService is successfully stopped on N1.

Error occurring on the server:

[12:42:31,848][SEVERE][services-deployment-worker-#74%main-grid%][ServiceDeploymentTask] Error occurred while initializing deployment task, err=Cannot invoke "org.apache.ignite.internal.processors.service.ServiceInfo.name()" because "rmv" is null
java.lang.NullPointerException: Cannot invoke "org.apache.ignite.internal.processors.service.ServiceInfo.name()" because "rmv" is null
        at org.apache.ignite.internal.processors.service.IgniteServiceProcessor.lambda$updateDeployedServices$4(IgniteServiceProcessor.java:1599)
        at java.base/java.util.HashMap.forEach(HashMap.java:1421)
        at java.base/java.util.Collections$UnmodifiableMap.forEach(Collections.java:1553)
        at org.apache.ignite.internal.processors.service.IgniteServiceProcessor.updateDeployedServices(IgniteServiceProcessor.java:1594)
...

I looked at the source code for the void updateDeployedServices(final ServiceDeploymentActions depActions) method in the modules/core/src/main/java/org/apache/ignite/internal/processors/service/IgniteServiceProcessor.java file. In the ServiceInfo line rmv = deployedServices.remove(srvcId); the deployedServices.remove(srvcId) method probably returns null and this is not handled in any way so an exception is thrown on deployedServicesByName.remove(rmv.name())

[ptupitsyn]

Looks like a bug.

I wonder if having a mix of .NET and Java nodes causes this.

Could you please try using Apache.Ignite.exe instead of ignite.bat to start the server node and see if the bug still occurs?

[alex401401]

We did not find Apache.Ignite.exe in the Ignite 2.16.0 distibutive. So we run it in this way: dotnet Apache.Ignite.Executable.dll.
Everything is fine here. There is no error.

[ptupitsyn]

Thank you for the confirmation. Yes, dotnet Apache.Ignite.Executable.dll is correct.

Ticket created: https://issues.apache.org/jira/browse/IGNITE-23123

[alex401401]

The error is also reproduced on a simpler variant of 1 java server and 1 NET thick client. On the client we run the following code:
var cluster = Ignite.GetCluster().ForDotNet();
IServices services = cluster.GetServices();
services.DeployNodeSingleton(‘TestService’, new TestServiceImpl());
services.Cancel(‘TestService’);