gianm opened a new issue #6114: Kafka supervisor with unresolvable bootstrap.servers blocks startup URL: https://github.com/apache/incubator-druid/issues/6114 Kafka supervisors with unresolvable bootstrap.servers will block overlord startup. The stack trace looks like this: ``` 2018-08-06T14:10:00,850 ERROR [LeaderSelector[/druid/overlord/_OVERLORD]] io.druid.curator.discovery.CuratorDruidLeaderSelector - listener becomeLeader() failed. Unable to become leader: {class=io.druid .curator.discovery.CuratorDruidLeaderSelector, exceptionType=class java.lang.RuntimeException, exceptionMessage=java.lang.reflect.InvocationTargetException} java.lang.RuntimeException: java.lang.reflect.InvocationTargetException at com.google.common.base.Throwables.propagate(Throwables.java:160) ~[guava-16.0.1.jar:?] at io.druid.indexing.overlord.TaskMaster$1.becomeLeader(TaskMaster.java:144) ~[druid-indexing-service-0.12.1-iap8.jar:0.12.1-iap8] at io.druid.curator.discovery.CuratorDruidLeaderSelector$1.isLeader(CuratorDruidLeaderSelector.java:98) [druid-server-0.12.1-iap8.jar:0.12.1-iap8] at org.apache.curator.framework.recipes.leader.LeaderLatch$9.apply(LeaderLatch.java:665) [curator-recipes-4.0.0.jar:4.0.0] at org.apache.curator.framework.recipes.leader.LeaderLatch$9.apply(LeaderLatch.java:661) [curator-recipes-4.0.0.jar:4.0.0] at org.apache.curator.framework.listen.ListenerContainer$1.run(ListenerContainer.java:93) [curator-framework-4.0.0.jar:4.0.0] at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [?:1.8.0_161] at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [?:1.8.0_161] at java.lang.Thread.run(Thread.java:748) [?:1.8.0_161] Caused by: java.lang.reflect.InvocationTargetException at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_161] at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_161] at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_161] at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_161] at io.druid.java.util.common.lifecycle.Lifecycle$AnnotationBasedHandler.start(Lifecycle.java:413) ~[java-util-0.12.1-iap8.jar:0.12.1-iap8] at io.druid.java.util.common.lifecycle.Lifecycle.start(Lifecycle.java:311) ~[java-util-0.12.1-iap8.jar:0.12.1-iap8] at io.druid.indexing.overlord.TaskMaster$1.becomeLeader(TaskMaster.java:141) ~[druid-indexing-service-0.12.1-iap8.jar:0.12.1-iap8] ... 7 more Caused by: org.apache.kafka.common.KafkaException: Failed to construct kafka consumer at org.apache.kafka.clients.consumer.KafkaConsumer.<init>(KafkaConsumer.java:717) ~[?:?] at org.apache.kafka.clients.consumer.KafkaConsumer.<init>(KafkaConsumer.java:597) ~[?:?] at io.druid.indexing.kafka.supervisor.KafkaSupervisor.getKafkaConsumer(KafkaSupervisor.java:904) ~[?:?] at io.druid.indexing.kafka.supervisor.KafkaSupervisor.start(KafkaSupervisor.java:354) ~[?:?] at io.druid.indexing.overlord.supervisor.SupervisorManager.createAndStartSupervisorInternal(SupervisorManager.java:231) ~[druid-indexing-service-0.12.1-iap8.jar:0.12.1-iap8] at io.druid.indexing.overlord.supervisor.SupervisorManager.start(SupervisorManager.java:105) ~[druid-indexing-service-0.12.1-iap8.jar:0.12.1-iap8] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_161] at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_161] at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_161] at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_161] at io.druid.java.util.common.lifecycle.Lifecycle$AnnotationBasedHandler.start(Lifecycle.java:413) ~[java-util-0.12.1-iap8.jar:0.12.1-iap8] at io.druid.java.util.common.lifecycle.Lifecycle.start(Lifecycle.java:311) ~[java-util-0.12.1-iap8.jar:0.12.1-iap8] at io.druid.indexing.overlord.TaskMaster$1.becomeLeader(TaskMaster.java:141) ~[druid-indexing-service-0.12.1-iap8.jar:0.12.1-iap8] ... 7 more Caused by: org.apache.kafka.common.config.ConfigException: No resolvable bootstrap urls given in bootstrap.servers at org.apache.kafka.clients.ClientUtils.parseAndValidateAddresses(ClientUtils.java:60) ~[?:?] at org.apache.kafka.clients.consumer.KafkaConsumer.<init>(KafkaConsumer.java:654) ~[?:?] at org.apache.kafka.clients.consumer.KafkaConsumer.<init>(KafkaConsumer.java:597) ~[?:?] at io.druid.indexing.kafka.supervisor.KafkaSupervisor.getKafkaConsumer(KafkaSupervisor.java:904) ~[?:?] at io.druid.indexing.kafka.supervisor.KafkaSupervisor.start(KafkaSupervisor.java:354) ~[?:?] at io.druid.indexing.overlord.supervisor.SupervisorManager.createAndStartSupervisorInternal(SupervisorManager.java:231) ~[druid-indexing-service-0.12.1-iap8.jar:0.12.1-iap8] at io.druid.indexing.overlord.supervisor.SupervisorManager.start(SupervisorManager.java:105) ~[druid-indexing-service-0.12.1-iap8.jar:0.12.1-iap8] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_161] at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_161] at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_161] at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_161] at io.druid.java.util.common.lifecycle.Lifecycle$AnnotationBasedHandler.start(Lifecycle.java:413) ~[java-util-0.12.1-iap8.jar:0.12.1-iap8] at io.druid.java.util.common.lifecycle.Lifecycle.start(Lifecycle.java:311) ~[java-util-0.12.1-iap8.jar:0.12.1-iap8] at io.druid.indexing.overlord.TaskMaster$1.becomeLeader(TaskMaster.java:141) ~[druid-indexing-service-0.12.1-iap8.jar:0.12.1-iap8] ... 7 more ```
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