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From Hironori Ogibayashi <ogibaya...@gmail.com>
Subject Re: Checkpoint takes long with FlinkKafkaConsumer
Date Thu, 16 Jun 2016 13:21:39 GMT
Ufuk,

Yes, of course. I will be sure to update when I got some more information.

Hironori

2016-06-16 1:56 GMT+09:00 Ufuk Celebi <uce@apache.org>:
> Hey Hironori,
>
> thanks for reporting this. Could you please update this thread when
> you have more information from the Kafka list?
>
> – Ufuk
>
>
> On Wed, Jun 15, 2016 at 2:48 PM, Hironori Ogibayashi
> <ogibayashi@gmail.com> wrote:
>> Kostas,
>>
>> Thank you for your advise. I have posted my question to the Kafka mailing list.
>> I think Kafka brokers are fine because no errors on producer side with
>> 15,000 msg/sec and
>> from OS metrics, all of my brokers receives almost the same amount of
>> network traffic.
>>
>> Thanks,
>> Hironori
>>
>>
>>
>>
>> 2016-06-14 22:40 GMT+09:00 Kostas Kloudas <k.kloudas@data-artisans.com>:
>>> Hello Hironori,
>>>
>>> The logs just show that you get stuck in the Kafka consumer polling loop,
>>> which does not allow the consumer lock to be released. Thus the Flink
>>> part of the consumer is never actually called.
>>>
>>> To my understanding this does not seem to be a Flink issue.
>>> Or at least this is not shown from the logs.
>>>
>>> From googling a bit, I found this:
>>>
>>> http://stackoverflow.com/questions/35636739/kafka-consumer-marking-the-coordinator-2147483647-dead
>>>
>>> which relates the problem to network issues.
>>>
>>> Have you tried posting the problem also to the Kafka mailing list?
>>> Can it be that the kafka broker fails and tries to reconnect but does not
>>> make it?
>>>
>>> Kostas
>>>
>>> On Jun 14, 2016, at 2:59 PM, Hironori Ogibayashi <ogibayashi@gmail.com>
>>> wrote:
>>>
>>> Kostas,
>>>
>>> I have attached a log file from one of the taskManager. (The same host
>>> I executed jstack)
>>> I noticed that there are lots of "Marking the coordinator 2147482645
>>> dead" message in the log.
>>> MyContinuousProcessingTimeTriggerGlobal in the log is my custom
>>> trigger which is based on
>>> ContinuousProcessingTimeTrigger but clean up windows when it received
>>> specific log records.
>>>
>>> Thanks,
>>> Hironori
>>>
>>> 2016-06-14 21:23 GMT+09:00 Kostas Kloudas <k.kloudas@data-artisans.com>:
>>>
>>> Hi Hironori,
>>>
>>> Could you also provide the logs of the taskManager?
>>>
>>> As you described, it seems that the consumer is stuck in the polling loop,
>>> although Flink polls with
>>> a timeout. This would normally mean that periodically it should release the
>>> lock for the checkpoints to go through.
>>>
>>> The logs of the task manager can help at clarifying why this does not
>>> happen.
>>>
>>> Thanks,
>>> Kostas
>>>
>>> On Jun 14, 2016, at 12:48 PM, Hironori Ogibayashi <ogibayashi@gmail.com>
>>> wrote:
>>>
>>> Kostas,
>>>
>>> Thank you for your response.
>>> Yes, I am using latest Flink, which is 1.0.3.
>>>
>>> Thanks,
>>> Hironori
>>>
>>> 2016-06-14 19:02 GMT+09:00 Kostas Kloudas <k.kloudas@data-artisans.com>:
>>>
>>> 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 <ogibayashi@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
>>>
>>>
>>>
>>> <flink-flink-taskmanager-0-FLINK1503.log.gz>
>>>
>>>

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