ERROR Error registering metrics! (com.uber.stream.kafka.mirrormaker.controller.validation.ValidationManager:266) java.lang.NullPointerException

When running the controller, after a few minute I see this:

ERROR Error registering metrics! (com.uber.stream.kafka.mirrormaker.controller.validation.ValidationManager:266)
java.lang.NullPointerException
	at com.uber.stream.kafka.mirrormaker.controller.validation.ValidationManager.updatePerWorkerISMetrics(ValidationManager.java:263)
	at com.uber.stream.kafka.mirrormaker.controller.validation.ValidationManager.validateExternalView(ValidationManager.java:205)
	at com.uber.stream.kafka.mirrormaker.controller.validation.ValidationManager$1.run(ValidationManager.java:82)
	at java.util.concurrent.Executors$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:748)

Configuration is as follows:

[2019-01-06 10:13:29,732] INFO Trying to init ControllerStarter with config:
{
	kafka.source.clusters :
	kafka.destination.clusters :
	federated.enabled : false
	federated.deployment.name :
	controller.helix.cluster.name : ureplicator
	controller.zk.str : zookeeper.ureplicator.svc.cluster.local:2181
	controller.port : 9000
	controller.mode : auto
	controller.instance.id : ureplicator-controller-6977f88fb8-95jhl
	controller.environment : dev
	controller.graphite.host : prometheus-graphite-exporter.monitoring.svc.cluster.local
	controller.graphite.port : 9109
	controller.metrics.prefix : kafka-mirror-maker-controller
	controller.c3.host : localhost
	controller.c3.port : 0
	controller.enable.auto.whitelist : true
	controller.enable.auto.topic.expansion : true
	controller.pattern.exclude.topics : __consumer_offsets
	controller.srckafka.zkStr : 18.209.172.99:2181
	controller.destkafka.zkStr : zookeeper.kafka-destination.svc.cluster.local:2181
	controller.max.working.instances : 0
	controller.auto.rebalance.delay.in.seconds : 120
	controller.refresh.time.in.seconds : 20
	controller.init.wait.time.in.seconds : 10
	controller.auto.rebalance.period.in.seconds : 0
	controller.auto.rebalance.min.interval.in.seconds : 600
	controller.auto.rebalance.min.lag.in.seconds : 900
	controller.auto.rebalance.min.lag.offset : 100000
	controller.auto.rebalance.max.offset.valid.in.seconds : 1800
	controller.workload.refresh.period.in.seconds : 600
	controller.auto.rebalance.workload.ratio.threshold : 1.2
	controller.auto.rebalance.max.dedicated.ratio : 0.5
	controller.auto.rebalance.max.stuck.partition.movements : 3
	controller.auto.rebalance.move.stuck.partition.after.minutes : 20
	controller.num.offset.thread : 10
	controller.blocking.queue.size : 30000
	controller.offset.refresh.interval.in.sec : 300
	controller.backup.to.git : false
	controller.local.backup.file.path : /tmp/uReplicator-controller
	config.file :
}
 (com.uber.stream.kafka.mirrormaker.controller.ControllerStarter:63)

I hope this information is enough.

The version is built form master, using my own built docker image rantav/ureplicator:4790496

[xhl1988]

It’s not a bug but we required that information/format as the prefix of the metrics. We will make it not a hard requirement or make it more clear.

[yangy0000]

Fixed #200