How to debug Apache Storm in Eclipse?

Question

We can generate storm jar using particular parameter. However, if we need to debug this project (actually a far) locally as well as remotely?

If it is simple jar, th

Answer 1

If you want to remote debug, you need to enable debugging in worker JVMs. See here for the correct Java flags: Remote debugging a Java application

Add this flags in all/shared supervisor storm.yaml to entry worker.childopts (it might be necessary to restart Storm cluster). You need to make sure, that only a single worker is stared per host! Otherwise, two JVMs want to open the same port and one will fail of course.

In Eclipse, choose Run -> Debug Configuration and create a new Remote Java Application. Specify the host and port (port must be the same as specified in worker.childopts) of the running worker JVM you want to debug.

Answer 2

To enable debugging across the various supervisor VMs, all you have to do is edit the storm.yaml file and update the worker.childopts entry to something like:

worker.childopts: "-agentlib:jdwp=transport=dt_socket,server=y,suspend=n,address=5%ID%"

If you had your supervisors on ports 6700,6701,6702 etc., this would create a debug port on 56700,56701,56702 etc.