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https://issues.apache.org/jira/browse/KAFKA-1648?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14157333#comment-14157333
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Mayuresh Gharat commented on KAFKA-1648:
----------------------------------------
Created reviewboard https://reviews.apache.org/r/26291/diff/
against branch origin/trunk
> Round robin consumer balance throws an NPE when there are no topics
> -------------------------------------------------------------------
>
> Key: KAFKA-1648
> URL: https://issues.apache.org/jira/browse/KAFKA-1648
> Project: Kafka
> Issue Type: Bug
> Components: consumer
> Reporter: Todd Palino
> Assignee: Mayuresh Gharat
> Labels: newbie
> Attachments: KAFKA-1648.patch
>
>
> If you use the roundrobin rebalance method with a wildcard consumer, and
> there are no topics in the cluster, rebalance throws a NullPointerException
> in the consumer and fails. It retries the rebalance, but will continue to
> throw the NPE.
> 2014/09/23 17:51:16.147 [ZookeeperConsumerConnector]
> [kafka-audit_lva1-app0007.corp-1411494404908-4e620544], Cleared all relevant
> queues for this fetcher
> 2014/09/23 17:51:16.147 [ZookeeperConsumerConnector]
> [kafka-audit_lva1-app0007.corp-1411494404908-4e620544], Cleared the data
> chunks in all the consumer message iterators
> 2014/09/23 17:51:16.148 [ZookeeperConsumerConnector]
> [kafka-audit_lva1-app0007.corp-1411494404908-4e620544], Committing all
> offsets after clearing the fetcher queues
> 2014/09/23 17:51:46.148 [ZookeeperConsumerConnector]
> [kafka-audit_lva1-app0007.corp-1411494404908-4e620544], begin rebalancing
> consumer kafka-audit_lva1-app0007.corp-1411494404908-4e620544 try #0
> 2014/09/23 17:51:46.148 ERROR [OffspringServletRuntime] [main]
> [kafka-console-audit] [] Boot listener
> com.linkedin.kafkaconsoleaudit.KafkaConsoleAuditBootListener failed
> kafka.common.ConsumerRebalanceFailedException:
> kafka-audit_lva1-app0007.corp-1411494404908-4e620544 can't rebalance after 10
> retries
> at
> kafka.consumer.ZookeeperConsumerConnector$ZKRebalancerListener.syncedRebalance(ZookeeperConsumerConnector.scala:630)
> at
> kafka.consumer.ZookeeperConsumerConnector.kafka$consumer$ZookeeperConsumerConnector$$reinitializeConsumer(ZookeeperConsumerConnector.scala:897)
> at
> kafka.consumer.ZookeeperConsumerConnector$WildcardStreamsHandler.<init>(ZookeeperConsumerConnector.scala:931)
> at
> kafka.consumer.ZookeeperConsumerConnector.createMessageStreamsByFilter(ZookeeperConsumerConnector.scala:159)
> at
> kafka.javaapi.consumer.ZookeeperConsumerConnector.createMessageStreamsByFilter(ZookeeperConsumerConnector.scala:101)
> at
> com.linkedin.tracker.consumer.TrackingConsumerImpl.initWildcardIterators(TrackingConsumerImpl.java:88)
> at
> com.linkedin.tracker.consumer.TrackingConsumerImpl.getWildcardIterators(TrackingConsumerImpl.java:116)
> at
> com.linkedin.kafkaconsoleaudit.KafkaConsoleAudit.createAuditThreads(KafkaConsoleAudit.java:59)
> at
> com.linkedin.kafkaconsoleaudit.KafkaConsoleAudit.initializeAudit(KafkaConsoleAudit.java:50)
> at
> com.linkedin.kafkaconsoleaudit.KafkaConsoleAuditFactory.createInstance(KafkaConsoleAuditFactory.java:125)
> at
> com.linkedin.kafkaconsoleaudit.KafkaConsoleAuditFactory.createInstance(KafkaConsoleAuditFactory.java:20)
> at
> com.linkedin.util.factory.SimpleSingletonFactory.createInstance(SimpleSingletonFactory.java:20)
> at
> com.linkedin.util.factory.SimpleSingletonFactory.createInstance(SimpleSingletonFactory.java:14)
> at com.linkedin.util.factory.Generator.doGetBean(Generator.java:337)
> at com.linkedin.util.factory.Generator.getBean(Generator.java:270)
> at
> com.linkedin.kafkaconsoleaudit.KafkaConsoleAuditBootListener.onBoot(KafkaConsoleAuditBootListener.java:16)
> at
> com.linkedin.offspring.servlet.OffspringServletRuntime.startGenerator(OffspringServletRuntime.java:147)
> at
> com.linkedin.offspring.servlet.OffspringServletRuntime.start(OffspringServletRuntime.java:73)
> at
> com.linkedin.offspring.servlet.OffspringServletContextListener.contextInitialized(OffspringServletContextListener.java:28)
> at
> org.eclipse.jetty.server.handler.ContextHandler.callContextInitialized(ContextHandler.java:771)
> at
> org.eclipse.jetty.servlet.ServletContextHandler.callContextInitialized(ServletContextHandler.java:424)
> at
> org.eclipse.jetty.server.handler.ContextHandler.startContext(ContextHandler.java:763)
> at
> org.eclipse.jetty.servlet.ServletContextHandler.startContext(ServletContextHandler.java:249)
> at
> org.eclipse.jetty.webapp.WebAppContext.startContext(WebAppContext.java:1250)
> at
> org.eclipse.jetty.server.handler.ContextHandler.doStart(ContextHandler.java:706)
> at
> org.eclipse.jetty.webapp.WebAppContext.doStart(WebAppContext.java:492)
> at
> org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:64)
> at
> com.linkedin.emweb.ContextBasedHandlerImpl.doStart(ContextBasedHandlerImpl.java:105)
> at
> org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:64)
> at
> com.linkedin.emweb.WebappDeployerImpl.start(WebappDeployerImpl.java:333)
> at
> com.linkedin.emweb.WebappDeployerImpl.deploy(WebappDeployerImpl.java:187)
> at
> com.linkedin.emweb.StateKeeperWebappDeployer.deploy(StateKeeperWebappDeployer.java:75)
> at
> com.linkedin.emweb.StateKeeperWebappDeployer.restore(StateKeeperWebappDeployer.java:62)
> at
> com.linkedin.emweb.WebappRunner.restoreServerState(WebappRunner.java:171)
> at com.linkedin.emweb.BaseRunner.start(BaseRunner.java:96)
> at
> com.linkedin.spring.cmdline.ServerCmdLineApp.start(ServerCmdLineApp.java:86)
> at
> com.linkedin.spring.cmdline.ServerCmdLineApp.doRun(ServerCmdLineApp.java:102)
> at
> com.linkedin.spring.cmdline.CmdLineAppRunner.run(CmdLineAppRunner.java:246)
> at
> com.linkedin.spring.cmdline.CmdLineAppRunner.main(CmdLineAppRunner.java:480)
> (note - the com.linkedin stuff in the stack trace is from the container we
> run our applications in and does not affect the operation of the rebalance)
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