hellobabygogo opened a new issue #7763: Druid 0.12.3 - Middle Managers - NullPointerException Jackson URL: https://github.com/apache/incubator-druid/issues/7763 Hi, all We are running Druid 0.12.3 on production. Every hour we run approximately 2000 tasks on middle managers. Every few hours one or two real time index tasks are failing with the same error: 2019-05-23T16:23:52,414 ERROR [main] io.druid.cli.CliPeon - Error when starting up. Failing. java.lang.reflect.InvocationTargetException at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_77] at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_77] at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_77] at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_77] at io.druid.java.util.common.lifecycle.Lifecycle$AnnotationBasedHandler.start(Lifecycle.java:421) ~[java-util-0.12.3-111.jar:0.12.3-111] at io.druid.java.util.common.lifecycle.Lifecycle.start(Lifecycle.java:319) ~[java-util-0.12.3-111.jar:0.12.3-111] at io.druid.guice.LifecycleModule$2.start(LifecycleModule.java:134) ~[druid-api-0.12.3-111.jar:0.12.3-111] at io.druid.cli.GuiceRunnable.initLifecycle(GuiceRunnable.java:101) [druid-services-0.12.3-111.jar:0.12.3-111] at io.druid.cli.CliPeon.run(CliPeon.java:301) [druid-services-0.12.3-111.jar:0.12.3-111] at io.druid.cli.Main.main(Main.java:117) [druid-services-0.12.3-111.jar:0.12.3-111] Caused by: java.lang.NullPointerException at org.codehaus.jackson.JsonFactory.createJsonParser(JsonFactory.java:604) ~[jackson-core-asl-1.9.13.jar:1.9.13] at org.codehaus.jackson.map.ObjectMapper.readValue(ObjectMapper.java:1973) ~[jackson-mapper-asl-1.9.13.jar:1.9.13] at org.apache.curator.x.discovery.details.JsonInstanceSerializer.deserialize(JsonInstanceSerializer.java:86) ~[curator-x-discovery-4.0.0.jar:?] at org.apache.curator.x.discovery.details.ServiceCacheImpl.addInstance(ServiceCacheImpl.java:193) ~[curator-x-discovery-4.0.0.jar:?] at org.apache.curator.x.discovery.details.ServiceCacheImpl.start(ServiceCacheImpl.java:96) ~[curator-x-discovery-4.0.0.jar:?] at org.apache.curator.x.discovery.details.ServiceProviderImpl.start(ServiceProviderImpl.java:75) ~[curator-x-discovery-4.0.0.jar:?] at io.druid.curator.discovery.ServerDiscoverySelector.start(ServerDiscoverySelector.java:138) ~[druid-server-0.12.3-111.jar:0.12.3-111] ... 10 more I see someone also meet this problem and He thought this is is a issue of curator : https://github.com/apache/curator/commit/cc30b67c8dbe24babd31ed654e9536fe776b8a18. how about merge this patch or replace our curator version?
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