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https://issues.apache.org/jira/browse/KAFKA-2944?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15174991#comment-15174991
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Gwen Shapira commented on KAFKA-2944:
-------------------------------------
Created PR https://github.com/apache/kafka/pull/993 for partial improvement
here.
> NullPointerException in KafkaConfigStorage when config storage starts right
> before shutdown request
> ---------------------------------------------------------------------------------------------------
>
> Key: KAFKA-2944
> URL: https://issues.apache.org/jira/browse/KAFKA-2944
> Project: Kafka
> Issue Type: Bug
> Components: copycat
> Affects Versions: 0.9.0.0
> Reporter: Ewen Cheslack-Postava
> Assignee: Ewen Cheslack-Postava
>
> Relevant log where you can see a config update starting, then the request to
> shutdown happens and we end up with a NullPointerException:
> {quote}
> [2015-12-03 09:12:55,712] DEBUG Change in connector task count from 2 to 3,
> writing updated task configurations
> (org.apache.kafka.connect.runtime.distributed.DistributedHerder)
> [2015-12-03 09:12:56,224] INFO Kafka Connect stopping
> (org.apache.kafka.connect.runtime.Connect)
> [2015-12-03 09:12:56,224] INFO Stopping REST server
> (org.apache.kafka.connect.runtime.rest.RestServer)
> [2015-12-03 09:12:56,227] INFO Stopped
> ServerConnector@10cb550e{HTTP/1.1}{0.0.0.0:8083}
> (org.eclipse.jetty.server.ServerConnector)
> [2015-12-03 09:12:56,234] INFO Stopped
> o.e.j.s.ServletContextHandler@3f8a24d5{/,null,UNAVAILABLE}
> (org.eclipse.jetty.server.handler.ContextHandler)
> [2015-12-03 09:12:56,235] INFO REST server stopped
> (org.apache.kafka.connect.runtime.rest.RestServer)
> [2015-12-03 09:12:56,235] INFO Herder stopping
> (org.apache.kafka.connect.runtime.distributed.DistributedHerder)
> [2015-12-03 09:12:58,209] ERROR Unexpected exception in KafkaBasedLog's work
> thread (org.apache.kafka.connect.util.KafkaBasedLog)
> java.lang.NullPointerException
> at
> org.apache.kafka.connect.storage.KafkaConfigStorage.completeTaskIdSet(KafkaConfigStorage.java:558)
> at
> org.apache.kafka.connect.storage.KafkaConfigStorage.access$1200(KafkaConfigStorage.java:143)
> at
> org.apache.kafka.connect.storage.KafkaConfigStorage$1.onCompletion(KafkaConfigStorage.java:476)
> at
> org.apache.kafka.connect.storage.KafkaConfigStorage$1.onCompletion(KafkaConfigStorage.java:372)
> at
> org.apache.kafka.connect.util.KafkaBasedLog.poll(KafkaBasedLog.java:235)
> at
> org.apache.kafka.connect.util.KafkaBasedLog.readToLogEnd(KafkaBasedLog.java:275)
> at
> org.apache.kafka.connect.util.KafkaBasedLog.access$300(KafkaBasedLog.java:70)
> at
> org.apache.kafka.connect.util.KafkaBasedLog$WorkThread.run(KafkaBasedLog.java:307)
> [2015-12-03 09:13:26,704] ERROR Failed to write root configuration to Kafka:
> (org.apache.kafka.connect.storage.KafkaConfigStorage)
> java.util.concurrent.TimeoutException: Timed out waiting for future
> at
> org.apache.kafka.connect.util.ConvertingFutureCallback.get(ConvertingFutureCallback.java:74)
> at
> org.apache.kafka.connect.storage.KafkaConfigStorage.putTaskConfigs(KafkaConfigStorage.java:352)
> at
> org.apache.kafka.connect.runtime.distributed.DistributedHerder.reconfigureConnector(DistributedHerder.java:737)
> at
> org.apache.kafka.connect.runtime.distributed.DistributedHerder.reconfigureConnectorTasksWithRetry(DistributedHerder.java:677)
> at
> org.apache.kafka.connect.runtime.distributed.DistributedHerder.startConnector(DistributedHerder.java:673)
> at
> org.apache.kafka.connect.runtime.distributed.DistributedHerder.startWork(DistributedHerder.java:640)
> at
> org.apache.kafka.connect.runtime.distributed.DistributedHerder.handleRebalanceCompleted(DistributedHerder.java:598)
> at
> org.apache.kafka.connect.runtime.distributed.DistributedHerder.tick(DistributedHerder.java:184)
> at
> org.apache.kafka.connect.runtime.distributed.DistributedHerder.run(DistributedHerder.java:159)
> at java.lang.Thread.run(Thread.java:745)
> [2015-12-03 09:13:26,704] ERROR Failed to reconfigure connector's tasks,
> retrying after backoff:
> (org.apache.kafka.connect.runtime.distributed.DistributedHerder)
> org.apache.kafka.connect.errors.ConnectException: Error writing root
> configuration to Kafka
> at
> org.apache.kafka.connect.storage.KafkaConfigStorage.putTaskConfigs(KafkaConfigStorage.java:355)
> at
> org.apache.kafka.connect.runtime.distributed.DistributedHerder.reconfigureConnector(DistributedHerder.java:737)
> at
> org.apache.kafka.connect.runtime.distributed.DistributedHerder.reconfigureConnectorTasksWithRetry(DistributedHerder.java:677)
> at
> org.apache.kafka.connect.runtime.distributed.DistributedHerder.startConnector(DistributedHerder.java:673)
> at
> org.apache.kafka.connect.runtime.distributed.DistributedHerder.startWork(DistributedHerder.java:640)
> at
> org.apache.kafka.connect.runtime.distributed.DistributedHerder.handleRebalanceCompleted(DistributedHerder.java:598)
> at
> org.apache.kafka.connect.runtime.distributed.DistributedHerder.tick(DistributedHerder.java:184)
> at
> org.apache.kafka.connect.runtime.distributed.DistributedHerder.run(DistributedHerder.java:159)
> at java.lang.Thread.run(Thread.java:745)
> Caused by: java.util.concurrent.TimeoutException: Timed out waiting for future
> at
> org.apache.kafka.connect.util.ConvertingFutureCallback.get(ConvertingFutureCallback.java:74)
> at
> org.apache.kafka.connect.storage.KafkaConfigStorage.putTaskConfigs(KafkaConfigStorage.java:352)
> ... 8 more
> {quote}
> I'm not certain that the issue is specifically due to shutting down (the
> KafkaConfigStorage.stop() hasn't been invoked yet when this occurs, so the
> underlying KafkaBasedLog is still running, although shutdown of the entire
> process has started), but this has only shown up during shutdown so far.
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