Candlepin gets stuck during startup forever, logging huge thread dump to error.log

Solution Verified - Updated -

Issue

  • having problems to send messages to qpidd in past, such that candlepin was in Suspended mode
  • resolving the issues with qpidd broker / katello_event_queue / ListenOnCandlepinEvents task
  • restarting tomcat to restore candlepin fails after few minutes, logging huge thread dump to /var/log/candlepin/error.log
  • candlepin CPU utilization is extremely high, such as a few hundreds percent to thousands percent and all the "/rhsm" related passenger requests are stuck and queuing for extremely long time, such as 30 minutes to an hour.

Environment

Red Hat Satellite 6.4 or newer

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