ERROR Exception emitting metrics (org.apache.hadoop.metrics2.sink.kafka.KafkaTimelineMetricsReporter) java.lang.IllegalArgumentException: connectionString cannot be null or empty at org.apache.ambari.metrics.sink.relocated.curator.shaded.com.google.common.base.Preconditions.checkArgument(Preconditions.java:122) at org.apache.ambari.metrics.sink.relocated.curator.ensemble.fixed.FixedEnsembleProvider.<init>(FixedEnsembleProvider.java:55) at org.apache.ambari.metrics.sink.relocated.curator.ensemble.fixed.FixedEnsembleProvider.<init>(FixedEnsembleProvider.java:43) at org.apache.ambari.metrics.sink.relocated.curator.CuratorZookeeperClient.<init>(CuratorZookeeperClient.java:69) at org.apache.hadoop.metrics2.sink.timeline.availability.MetricCollectorHAHelper.findLiveCollectorHostsFromZNode(MetricCollectorHAHelper.java:69) at org.apache.hadoop.metrics2.sink.timeline.AbstractTimelineMetricsSink.findPreferredCollectHost(AbstractTimelineMetricsSink.java:540) at org.apache.hadoop.metrics2.sink.timeline.AbstractTimelineMetricsSink.getCurrentCollectorHost(AbstractTimelineMetricsSink.java:286) at org.apache.hadoop.metrics2.sink.timeline.AbstractTimelineMetricsSink.emitMetrics(AbstractTimelineMetricsSink.java:327) at org.apache.hadoop.metrics2.sink.timeline.AbstractTimelineMetricsSink.emitMetrics(AbstractTimelineMetricsSink.java:307) at org.apache.hadoop.metrics2.sink.kafka.KafkaTimelineMetricsReporter.access$200(KafkaTimelineMetricsReporter.java:58) at org.apache.hadoop.metrics2.sink.kafka.KafkaTimelineMetricsReporter$TimelineScheduledReporter.report(KafkaTimelineMetricsReporter.java:334) at org.apache.hadoop.metrics2.sink.kafka.ScheduledReporter.report(ScheduledReporter.java:185) at org.apache.hadoop.metrics2.sink.kafka.ScheduledReporter$1.run(ScheduledReporter.java:137) at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308) at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:180) at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:294) 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:750) ... View more