JGroups Troubleshooting Techniques
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Internal
Verbose Logging
Suspend JVM Execution
A JVM running JGroups can be suspended from executing by sending the SIGSTOP signal into it:
kill -SIGSTOP <jvm-pid>
Execution can be later resumed by sending SIGCONT:
kill -SIGCONT <jvm-pid>
Practical Ways to Determine the Current View
- Group Membership based on GMS log entries
- Group Membership based on FD_SOCK VIEW_CHANGE log entries
- Current view obtained with the WildFly CLI
Threads
Look at threads: (regular,timer,OOB).