JGroups Troubleshooting Techniques: Difference between revisions
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* [[JGroups#Subjects|JGroups]] | * [[JGroups#Subjects|JGroups]] | ||
=Verbose Logging= | |||
=Suspend JVM Execution= | |||
A JVM running JGroups can be suspended from executing by sending the [[Linux Signals#SIGSTOP_.2819.29|SIGSTOP]] signal into it: | |||
<pre> | |||
kill -SIGSTOP <jvm-pid> | |||
</pre> | |||
Execution can be later resumed by sending [[Linux Signals#SIGCONT_.2818.29|SIGCONT]]: | |||
<pre> | |||
kill -SIGCONT <jvm-pid> | |||
</pre> | |||
Also see [[Linux Signals#SIGSTOP_.2819.29|SIGSTOP]] and [[Linux Signals#SIGCONT_.2818.29|SIGCONT]]. | |||
=Practical Ways to Determine the Current View= | |||
* [[JGroups Protocol GMS#Current_Group_Membership|Group Membership based on GMS log entries]] | |||
* [[JGroups Protocol FD_SOCK#VIEW_CHANGE|Group Membership based on FD_SOCK VIEW_CHANGE log entries]] | |||
* [[WildFly CLI - Obtaining the Current JGroups View|Current view obtained with the WildFly CLI]] | |||
=Threads= | |||
<font color=red>Look at threads: (regular,timer,OOB)</font>. | |||
Latest revision as of 17:01, 6 March 2016
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).