Hello Hironori, Are you using the latest Flink version? There were some changes in the FlinkConsumer in the latest releases.
Thanks, Kostas > On Jun 14, 2016, at 11:52 AM, Hironori Ogibayashi <ogibaya...@gmail.com> > wrote: > > Hello, > > I am running Flink job which reads topics from Kafka and write results > to Redis. I use FsStatebackend with HDFS. > > I noticed that taking checkpoint takes serveral minutes and sometimes expires. > --- > 2016-06-14 17:25:40,734 INFO > org.apache.flink.runtime.checkpoint.CheckpointCoordinator - > Completed checkpoint 1456 (in 257956 ms) > 2016-06-14 17:25:40,735 INFO > org.apache.flink.runtime.checkpoint.CheckpointCoordinator - > Triggering checkpoint 1457 @ 1465892740734 > 2016-06-14 17:35:40,735 INFO > org.apache.flink.runtime.checkpoint.CheckpointCoordinator - > Checkpoint 1457 expired before completing. > 2016-06-14 17:35:40,736 INFO > org.apache.flink.runtime.checkpoint.CheckpointCoordinator - > Triggering checkpoint 1458 @ 1465893340735 > 2016-06-14 17:45:40,736 INFO > org.apache.flink.runtime.checkpoint.CheckpointCoordinator - > Checkpoint 1458 expired before completing. > 2016-06-14 17:45:40,737 INFO > org.apache.flink.runtime.checkpoint.CheckpointCoordinator - > Triggering checkpoint 1459 @ 1465893940736 > 2016-06-14 17:55:40,738 INFO > org.apache.flink.runtime.checkpoint.CheckpointCoordinator - > Checkpoint 1459 expired before completing. > 2016-06-14 17:55:40,739 INFO > org.apache.flink.runtime.checkpoint.CheckpointCoordinator - > Triggering checkpoint 1460 @ 1465894540738 > --- > > According to WebUI, checkpoint size is just 1MB. Why checkpointing > takes so long? > > I took jstack during checkpointing. It looks that checkpointing thread > is blocked in commitOffsets. > > ---- > "Async calls on Source: Custom Source -> Flat Map (2/3)" daemon > prio=10 tid=0x00007f2b14010800 nid=0x1b89a waiting for monitor entry > [0x00007f2b3ddfc000] > java.lang.Thread.State: BLOCKED (on object monitor) > at > org.apache.flink.streaming.connectors.kafka.FlinkKafkaConsumer09.commitOffsets(FlinkKafkaConsumer09.java:392) > - waiting to lock <0x0000000659111b58> (a > org.apache.kafka.clients.consumer.KafkaConsumer) > at > org.apache.flink.streaming.connectors.kafka.FlinkKafkaConsumerBase.notifyCheckpointComplete(FlinkKafkaConsumerBase.java:169) > at > org.apache.flink.streaming.api.operators.AbstractUdfStreamOperator.notifyOfCompletedCheckpoint(AbstractUdfStreamOperator.java:179) > at > org.apache.flink.streaming.runtime.tasks.StreamTask.notifyCheckpointComplete(StreamTask.java:596) > - locked <0x0000000659111cc8> (a java.lang.Object) > at org.apache.flink.runtime.taskmanager.Task$3.run(Task.java:945) > at > java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471) > at java.util.concurrent.FutureTask.run(FutureTask.java:262) > at > java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) > at > java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) > at java.lang.Thread.run(Thread.java:745) > --- > > Blocker is this. > > --- > "Thread-9" daemon prio=10 tid=0x00007f2b2440d000 nid=0x1b838 runnable > [0x00007f2b3dbfa000] > java.lang.Thread.State: RUNNABLE > at sun.nio.ch.EPollArrayWrapper.epollWait(Native Method) > at sun.nio.ch.EPollArrayWrapper.poll(EPollArrayWrapper.java:269) > at sun.nio.ch.EPollSelectorImpl.doSelect(EPollSelectorImpl.java:79) > at sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:87) > - locked <0x0000000659457dc8> (a sun.nio.ch.Util$2) > - locked <0x0000000659457db8> (a java.util.Collections$UnmodifiableSet) > - locked <0x0000000659457108> (a sun.nio.ch.EPollSelectorImpl) > at sun.nio.ch.SelectorImpl.select(SelectorImpl.java:98) > at org.apache.kafka.common.network.Selector.select(Selector.java:425) > at org.apache.kafka.common.network.Selector.poll(Selector.java:254) > at org.apache.kafka.clients.NetworkClient.poll(NetworkClient.java:256) > at > org.apache.kafka.clients.consumer.internals.ConsumerNetworkClient.clientPoll(ConsumerNetworkClient.java:320) > at > org.apache.kafka.clients.consumer.internals.ConsumerNetworkClient.poll(ConsumerNetworkClient.java:213) > at > org.apache.kafka.clients.consumer.internals.ConsumerNetworkClient.poll(ConsumerNetworkClient.java:193) > at > org.apache.kafka.clients.consumer.KafkaConsumer.pollOnce(KafkaConsumer.java:908) > at > org.apache.kafka.clients.consumer.KafkaConsumer.poll(KafkaConsumer.java:853) > at > org.apache.flink.streaming.connectors.kafka.FlinkKafkaConsumer09$ConsumerThread.run(FlinkKafkaConsumer09.java:449) > - locked <0x0000000659111b58> (a > org.apache.kafka.clients.consumer.KafkaConsumer) > --- > > If someone could advise me of the cause or the way to investigate > further, that would be appreciated. > > Thanks, > Hironori
