mod_cluster does not remove persistently hung JVM or route traffic away from it

Solution Unverified - Updated -

Issue

  • One of our backend JVMs reached a permanently stalled state. All requests to it were always timing out and all periodic ping attempts from mod_cluster to it were timing out. But still, mod_cluster never removed this bad JVM from the balancer and it continued to attempt requests to it.

Environment

  • JBoss Core Services (JBCS)
    • Apache httpd
    • mod_cluster
  • JBoss Enterprise Application Platform (EAP)
  • JBoss Web Server (JWS)
    • Tomcat

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