[KAFKA-94] KafkaServer can throw a NullPointerException during startup if zookeeper is down

• Type: Bug
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Component/s: core
• Assignee: Unassigned
• Reporter: Joel Jacob Koshy
• Created: 12/Aug/11 01:17
• Updated: 18/Jul/12 00:00
• Resolved: 20/Aug/11 03:57

Description

Starting up KafkaServer when zookeeper is down can lead to a NullPointerException as shown below. The LogManager throws a ZkTimeoutException from startup if zookeeper is down. This is caught and we call shutdown. socketServer is uninitialized at this point, and hence the NPE. Will upload patch in a bit.

2011/08/12 00:22:36.194 FATAL [KafkaServer] [pool-2-thread-1] [kafka] java.lang.NullPointerException
at kafka.server.KafkaServer.shutdown(KafkaServer.scala:98)
at kafka.server.KafkaServer.startup(KafkaServer.scala:84)
at kafka.server.KafkaServerStartable.startup(KafkaServerStartable.scala:40)
at com.linkedin.kafka.KafkaStartable.start(KafkaStartable.java:49)
at com.linkedin.spring.servlet.ComponentsContextLoaderListener.setServletContextAttributes(ComponentsContextLoaderListener.java:113)
at com.linkedin.spring.servlet.ComponentsContextLoaderListener.contextInitialized(ComponentsContextLoaderListener.java:50)
at org.mortbay.jetty.handler.ContextHandler.startContext(ContextHandler.java:549)
at org.mortbay.jetty.servlet.Context.startContext(Context.java:136)
at org.mortbay.jetty.webapp.WebAppContext.startContext(WebAppContext.java:1282)
at org.mortbay.jetty.handler.ContextHandler.doStart(ContextHandler.java:518)
at org.mortbay.jetty.webapp.WebAppContext.doStart(WebAppContext.java:499)
at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50)
at com.linkedin.emweb.ContextBasedHandlerImpl.doStart(ContextBasedHandlerImpl.java:123)
at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50)
at com.linkedin.emweb.WebappDeployerImpl.start(WebappDeployerImpl.java:324)
at com.linkedin.emweb.WebappDeployerImpl.deploy(WebappDeployerImpl.java:178)
at com.linkedin.emweb.StateKeeperWebappDeployer.deploy(StateKeeperWebappDeployer.java:73)
at com.linkedin.emweb.mbeans.WebappDeployerAdmin.deploy(WebappDeployerAdmin.java:86)
at com.linkedin.emweb.mbeans.WebappDeployerAdmin$1.call(WebappDeployerAdmin.java:130)
at com.linkedin.emweb.mbeans.WebappDeployerAdmin$1.call(WebappDeployerAdmin.java:127)
at com.linkedin.emweb.mbeans.WebappDeployerAdmin$3.call(WebappDeployerAdmin.java:171)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
at java.util.concurrent.FutureTask.run(FutureTask.java:138)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:619)