Should I open a JIRA for this? Gyula Fóra <gyula.f...@gmail.com> ezt írta (időpont: 2015. nov. 17., K, 11:30):
> Thanks for the quick response and thorough explanation :) > > Gyula > > Robert Metzger <rmetz...@apache.org> ezt írta (időpont: 2015. nov. 17., > K, 11:27): > >> I would try that approach first >> >> On Tue, Nov 17, 2015 at 11:26 AM, Stephan Ewen <se...@apache.org> wrote: >> >> > Another idea: The bug is fixed in the Zookeeper Client that Kafka uses, >> so >> > if we can bump the transitive dependency, that might fix it... >> > >> > On Tue, Nov 17, 2015 at 11:19 AM, Stephan Ewen <se...@apache.org> >> wrote: >> > >> > > Hey! >> > > >> > > The problem here is that there is no such thing as proper thread >> killing >> > > in Java (at least it makes everything unstable if you do). Threads >> need >> > to >> > > exit cooperatively. >> > > >> > > The Kafka Function calls simply are uninterruptibly stuck and never >> > return >> > > (pretty bad bug in their Zookeeper Client). As far as I know one >> cannot >> > > clean this up properly unless one kills the process. >> > > >> > > We could try and work around this by running the Zookeeper commit in a >> > > dedicated lightweight thread that shares no resources and thus does >> not >> > > make the system unstable if stopped (against better advise ;-) ) >> > > >> > > Stephan >> > > >> > > >> > > >> > > >> > > >> > > On Tue, Nov 17, 2015 at 10:43 AM, Ufuk Celebi <u...@apache.org> wrote: >> > > >> > >> 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 >> > >> >> > >> >> > > >> > >> >
