[Feature Request] Make multi-node gradle test clusters work with IntelliJ debugger

[peteralfonsi]

Is your feature request related to a problem? Please describe

When running local clusters with ./gradlew run you can provide -PnumNodes=<number of nodes> to run a cluster locally with more than one node. This is useful but unfortunately you can't use it with --debug-jvm. It'd be great if you could use both simultaneously.

Describe the solution you'd like

Currently it fails because each node expects a different debug server running on ports 5005, 5006, and 5007:

Running opensearch in debug mode (client), node{::runTask-0} expecting running debug server on port 5005
Running opensearch in debug mode (client), node{::runTask-1} expecting running debug server on port 5006
Running opensearch in debug mode (client), node{::runTask-2} expecting running debug server on port 5007

Maybe they could all point towards the same server at 5005?

Related component

Build

Describe alternatives you've considered

No response

Additional context

No response

[joonseolee]

Do you mind if I take this ticket?

[andrross]

@joonseolee I've assigned this to you. Thanks!

[joonseolee]

@peteralfonsi

I am able to debug successfully in IntelliJ by setting up 3 instances as shown in the image below and running the command in the terminal.
Am I perhaps not reproducing the issue correctly? Could you please verify this?

Command

 ./gradlew run -PnumNodes=3 --debug-jvm

Run/Debug configuration

Debug Mode

[andrross]

@peteralfonsi Can you follow up here?

[peteralfonsi]

Sorry, thought I had responded to this earlier.

Maybe we could add an equivalent config to @joonseolee 's test into .idea/runConfigurations in something like Debug_opensearch_multinode.xml alongside Debug_opensearch.xml? I think having a hardcoded 3 debug servers would be a reasonable choice if it's not easy to make this adjustable.