Issue
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Agents defined with a specific label in the JOC are not always available to jobs running in a Client controller
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You have in the logs a stacktrace like the one below:
2015-04-06 16:16:20.995-0400 [id=68] SEVERE hudson.triggers.SafeTimerTask#run: Timer task hudson.slaves.NodeProvisioner$NodeProvisionerInvoker@7f7a7b0d failed
java.lang.IllegalArgumentException: Node is defined more than once
at hudson.slaves.NodeList.<init>(NodeList.java:62)
at jenkins.model.Jenkins.setNodes(Jenkins.java:1696)
at jenkins.model.Jenkins.addNode(Jenkins.java:1679)
at hudson.slaves.NodeProvisioner.update(NodeProvisioner.java:184)
at hudson.slaves.NodeProvisioner.access$000(NodeProvisioner.java:51)
at hudson.slaves.NodeProvisioner$NodeProvisionerInvoker.doRun(NodeProvisioner.java:368)
at hudson.triggers.SafeTimerTask.run(SafeTimerTask.java:54)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
at java.util.concurrent.FutureTask$Sync.innerRunAndReset(FutureTask.java:351)
at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:178)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:178)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
at java.lang.Thread.run(Thread.java:722)