JGroups Troubleshooting Techniques

Internal

• JGroups

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>

Also see SIGSTOP and SIGCONT.

Quickly Review View Changes

FD_SOCK VIEW_CHANGE reporting

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