https://issues.apache.org/jira/browse/KAFKA-824
This has been fixed for Kafka’s 0.9.0 version. We should investigate why the job gets stuck though. Do you have a stack trace or any logs available? – Ufuk > On 17 Nov 2015, at 09:24, Gyula Fóra <gyf...@apache.org> wrote: > > Hey guys, > > I ran into some issue with the kafka consumers. > > I am reading from more than 50 topics with parallelism 1, and while running > the job I got the following exception during the checkpoint notification > (offset committing): > > 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:542) > 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 > > This happened at the same time on multiple kafka consumers. Could this be > some Zookeeper related issue? Maybe we should be aware of this. > > Another problem is that subsequently the whole pipeline got stuck at the > sources while canceling so the job could never restart. Maybe it would be > worth killing the whole thing and restart in these situations? > > Thanks, > Gyula
