==> /var/log/nodepool/nodepool-launcher.log <==
2018-07-01 01:30:27,120 INFO nodepool.PoolWorker.continuous-main: Assigning node request <NodeRequest {'nodes': [], 'state_time': 1530408622.0, 'id': '100-0000000003', 'declined_by': [], 'node_types': ['ubuntu-xenial'], 'state': 'requested', 'requestor': 'jenkins', 'stat': ZnodeStat(czxid=1628067, mzxid=1628067, ctime=1530408622671, mtime=1530408622671, version=0, cversion=0, aversion=0, ephemeralOwner=72606725090050086, dataLength=142, numChildren=0, pzxid=1628067), 'reuse': True}>

==> /var/log/nodepool/launcher-debug.log <==
2018-07-01 01:30:27,123 DEBUG nodepool.driver.NodeRequestHandler[nodepool-10657-PoolWorker.continuous-main]: Accepting node request 100-0000000003
2018-07-01 01:30:27,138 DEBUG nodepool.driver.NodeRequestHandler[nodepool-10657-PoolWorker.continuous-main]: Locked existing node 0000000003 for request 100-0000000003
2018-07-01 01:30:27,148 DEBUG nodepool.driver.NodeRequestHandler[nodepool-10657-PoolWorker.continuous-main]: Fulfilled node request 100-0000000003
2018-07-01 01:30:27,153 DEBUG nodepool.driver.NodeRequestHandler[nodepool-10657-PoolWorker.continuous-main]: Unlocked node 0000000003 for request 100-0000000003
2018-07-01 01:30:27,167 DEBUG nodepool.PoolWorker.continuous-main: Removing handler for request 100-0000000003

Jul 01, 2018 1:30:22 AM INFO com.rackspace.jenkins_nodepool.NodePool attemptProvisionWaiting on node to become available for task: ansible-lsn-site-func with label: nodepool-ubuntu-xenial with timeout: 500 seconds...
Jul 01, 2018 1:30:27 AM WARNING com.rackspace.jenkins_nodepool.NodePool acceptNodesFailed to lock nodejava.util.ArrayList cannot be cast to java.lang.String
java.lang.ClassCastException: java.util.ArrayList cannot be cast to java.lang.String
	at com.rackspace.jenkins_nodepool.NodePoolNode.getNPType(NodePoolNode.java:39)
	at com.rackspace.jenkins_nodepool.NodePoolNode.getJenkinsLabel(NodePoolNode.java:58)
	at com.rackspace.jenkins_nodepool.NodePoolNode.getName(NodePoolNode.java:62)
	at com.rackspace.jenkins_nodepool.NodePoolNode.toString(NodePoolNode.java:98)
	at java.util.Formatter$FormatSpecifier.printString(Formatter.java:2886)
	at java.util.Formatter$FormatSpecifier.print(Formatter.java:2763)
	at java.util.Formatter.format(Formatter.java:2520)
	at java.util.Formatter.format(Formatter.java:2455)
	at java.lang.String.format(String.java:2940)
	at com.rackspace.jenkins_nodepool.NodePool.acceptNodes(NodePool.java:222)
	at com.rackspace.jenkins_nodepool.NodePool.attemptProvisionNode2(NodePool.java:531)
	at com.rackspace.jenkins_nodepool.NodePool.attemptProvision(NodePool.java:485)
	at com.rackspace.jenkins_nodepool.NodePool.provisionNode(NodePool.java:451)
	at com.rackspace.jenkins_nodepool.NodePool.provisionNode(NodePool.java:425)
	at com.rackspace.jenkins_nodepool.NodePools.provisionNode(NodePools.java:151)
	at com.rackspace.jenkins_nodepool.NodePoolQueueListener.lambda$onEnterWaiting$0(NodePoolQueueListener.java:81)
	at jenkins.util.ContextResettingExecutorService$1.run(ContextResettingExecutorService.java:28)
	at jenkins.security.ImpersonatingExecutorService$1.run(ImpersonatingExecutorService.java:59)
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	at java.lang.Thread.run(Thread.java:748)