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From "Gyula Fora (JIRA)" <j...@apache.org>
Subject [jira] [Created] (FLINK-3067) Kafka source fails during checkpoint notifications with NPE
Date Tue, 24 Nov 2015 08:58:11 GMT
Gyula Fora created FLINK-3067:
---------------------------------

             Summary: Kafka source fails during checkpoint notifications with NPE
                 Key: FLINK-3067
                 URL: https://issues.apache.org/jira/browse/FLINK-3067
             Project: Flink
          Issue Type: Bug
            Reporter: Gyula Fora


While running a job with many kafka sources I experienced the following error during the checkpoint
notifications:

java.lang.RuntimeException: Error while confirming checkpoint
	at org.apache.flink.runtime.taskmanager.Task$2.run(Task.java:935)
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
	at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.NullPointerException
	at org.I0Itec.zkclient.ZkConnection.writeDataReturnStat(ZkConnection.java:115)
	at org.I0Itec.zkclient.ZkClient$10.call(ZkClient.java:817)
	at org.I0Itec.zkclient.ZkClient.retryUntilConnected(ZkClient.java:675)
	at org.I0Itec.zkclient.ZkClient.writeDataReturnStat(ZkClient.java:813)
	at org.I0Itec.zkclient.ZkClient.writeData(ZkClient.java:808)
	at org.I0Itec.zkclient.ZkClient.writeData(ZkClient.java:777)
	at kafka.utils.ZkUtils$.updatePersistentPath(ZkUtils.scala:332)
	at kafka.utils.ZkUtils.updatePersistentPath(ZkUtils.scala)
	at org.apache.flink.streaming.connectors.kafka.internals.ZookeeperOffsetHandler.setOffsetInZooKeeper(ZookeeperOffsetHandler.java:112)
	at org.apache.flink.streaming.connectors.kafka.internals.ZookeeperOffsetHandler.commit(ZookeeperOffsetHandler.java:80)
	at org.apache.flink.streaming.connectors.kafka.FlinkKafkaConsumer.notifyCheckpointComplete(FlinkKafkaConsumer.java:563)
	at org.apache.flink.streaming.api.operators.AbstractUdfStreamOperator.notifyOfCompletedCheckpoint(AbstractUdfStreamOperator.java:176)
	at org.apache.flink.streaming.runtime.tasks.StreamTask.notifyCheckpointComplete(StreamTask.java:478)
	at org.apache.flink.runtime.taskmanager.Task$2.run(Task.java:931)
	... 5 more
06:23:28,373 INFO  org.apache.flink.runtime.executiongraph.ExecutionGraph        - Source:
Kafka[event.rakdos.log] (1/1) (d79e6b7a25b1ac307d2e0c8

This resulted in the job crashing and getting stuck during cancelling which subsequently lead
to having to restart the cluster.

This might be a zookeeper issue but we should be able to handle it (catch the exception maybe).



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