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Received shutdown signal : is this something to be alarmed about ?

esalinasesalinas BroadMember, Broadie ✭✭✭

I ran a WDL and see the text

[2017-04-19 11:12:38,32] [info] WorkflowManagerActor: Received shutdown signal.

Is this text ("Received shutdown signal") something to be alarmed or concerned about? Does is signal exceptional or otherwise bad outcomes? I see the text "....finished with status 'Succeeded'" too.

...
...
[2017-04-19 11:12:26,74] [info] Message [cromwell.subworkflowstore.SubWorkflowStoreActor$SubWorkflowStoreCompleteSuccess] from Actor[akka://cromwell-system/user/SingleWorkflowRunnerActor/$b#1007576830] to Actor[akka://cromwell-system/user/SingleWorkflowRunnerActor/WorkflowManagerActor/WorkflowActor-516b5a26-494a-4c54-aeb4-fe60b77d9d5e#1400295269] was not delivered. [1] dead letters encountered. This logging can be turned off or adjusted with configuration settings 'akka.log-dead-letters' and 'akka.log-dead-letters-during-shutdown'.
[2017-04-19 11:12:38,29] [info] SingleWorkflowRunnerActor workflow finished with status 'Succeeded'.
{
  "outputs": {
    "lego_plotter_workflow.lego_plotter_task.mut_legos_html": "/Users/esalinas/Downloads/lego_plotter/wdl_test/cromwell-executions/lego_plotter_workflow/516b5a26-494a-4c54-aeb4-fe60b77d9d5e/call-lego_plotter_task/execution/REBC-YQ-A90E-TP.maf.mutation_legos.html"
  },
  "id": "516b5a26-494a-4c54-aeb4-fe60b77d9d5e"
}
[2017-04-19 11:12:38,32] [info] WorkflowManagerActor: Received shutdown signal.
[2017-04-19 11:12:38,32] [info] Message [cromwell.engine.workflow.WorkflowManagerActor$AbortAllWorkflowsCommand$] from Actor[akka://cromwell-system/user/SingleWorkflowRunnerActor/WorkflowManagerActor#-652212440] to Actor[akka://cromwell-system/user/SingleWorkflowRunnerActor/WorkflowManagerActor#-652212440] was not delivered. [2] dead letters encountered. This logging can be turned off or adjusted with configuration settings 'akka.log-dead-letters' and 'akka.log-dead-letters-during-shutdown'.
wm8b1-75c:wdl_test esalinas$ 

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