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From: Jason Gustafson <jason@confluent.io>
Date: Wed, 31 Aug 2016 19:56:17 -0700
Message-ID: <CAJDuW=AG35sv-c2p-uM9AzK2La6s-XftoJ1bDh5D5VyTcjbtdA@mail.gmail.com>
Subject: Re: Kafka consumers unable to process message
To: users@kafka.apache.org
Cc: "dev@kafka.apache.org" <dev@kafka.apache.org>
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archived-at: Thu, 01 Sep 2016 02:56:43 -0000

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The exceptions show one of the replica fetcher threads on the broker
failing which makes perfect sense since some of the partitions were bound
to have leaders in the failed datacenter. I'd actually like to see the
consumer logs at DEBUG level if possible.

Thanks,
Jason

On Wed, Aug 31, 2016 at 7:48 PM, Ghosh, Achintya (Contractor) <
Achintya_Ghosh@comcast.com> wrote:

> Hi Jason,
>
> No, I didn't bring down any zookeeper server. Even I tried with 3
> zookeeper server one as an 'Observer' but the same issue.
>
> Here is the server log from one of the node of my other datacenter:
>
> [2016-09-01 01:25:19,221] INFO Truncating log TEST3-0 to offset 0.
> (kafka.log.Log)
> [2016-09-01 01:25:19,257] INFO [ReplicaFetcherThread-0-3], Starting
> (kafka.server.ReplicaFetcherThread)
> [2016-09-01 01:25:19,258] INFO [ReplicaFetcherManager on broker 4] Added
> fetcher for partitions List([[TEST3,0], initOffset 0 to broker
> BrokerEndPoint(3,psaq3-wc.sys.comcast.net,61616)] ) (kafka.server.
> ReplicaFetcherManager)
> [2016-09-01 01:26:14,154] WARN [ReplicaFetcherThread-0-3], Error in fetch
> kafka.server.ReplicaFetcherThread$FetchRequest@6618a925 (kafka.server.
> ReplicaFetcherThread)
> java.io.IOException: Connection to 3 was disconnected before the response
> was read
>         at kafka.utils.NetworkClientBlockingOps$$anonfun$
> blockingSendAndReceive$extension$1$$anonfun$apply$1.apply(
> NetworkClientBlockingOps.scala:87)
>         at kafka.utils.NetworkClientBlockingOps$$anonfun$
> blockingSendAndReceive$extension$1$$anonfun$apply$1.apply(
> NetworkClientBlockingOps.scala:84)
>         at scala.Option.foreach(Option.scala:257)
>         at kafka.utils.NetworkClientBlockingOps$$anonfun$
> blockingSendAndReceive$extension$1.apply(NetworkClientBlockingOps.
> scala:84)
>         at kafka.utils.NetworkClientBlockingOps$$anonfun$
> blockingSendAndReceive$extension$1.apply(NetworkClientBlockingOps.
> scala:80)
>         at kafka.utils.NetworkClientBlockingOps$.recursivePoll$2(
> NetworkClientBlockingOps.scala:137)
>         at kafka.utils.NetworkClientBlockingOps$.kafka$utils$
> NetworkClientBlockingOps$$pollContinuously$extension(
> NetworkClientBlockingOps.scala:143)
>         at kafka.utils.NetworkClientBlockingOps$.blockingSendAndReceive$
> extension(NetworkClientBlockingOps.scala:80)
>         at kafka.server.ReplicaFetcherThread.sendRequest(
> ReplicaFetcherThread.scala:244)
>         at kafka.server.ReplicaFetcherThread.fetch(
> ReplicaFetcherThread.scala:229)
>         at kafka.server.ReplicaFetcherThread.fetch(
> ReplicaFetcherThread.scala:42)
>         at kafka.server.AbstractFetcherThread.processFetchRequest(
> AbstractFetcherThread.scala:107)
>         at kafka.server.AbstractFetcherThread.doWork(
> AbstractFetcherThread.scala:98)
>         at kafka.utils.ShutdownableThread.run(ShutdownableThread.scala:63)
> [2016-09-01 01:26:16,189] WARN [ReplicaFetcherThread-0-3], Error in fetch
> kafka.server.ReplicaFetcherThread$FetchRequest@6e7e2578 (kafka.server.
> ReplicaFetcherThread)
> java.io.IOException: Connection to psaq3-wc.sys.comcast.net:61616 (id: 3
> rack: null) failed
>         at kafka.utils.NetworkClientBlockingOps$$anonfun$blockingReady$
> extension$2.apply(NetworkClientBlockingOps.scala:63)
>         at kafka.utils.NetworkClientBlockingOps$$anonfun$blockingReady$
> extension$2.apply(NetworkClientBlockingOps.scala:59)
>         at kafka.utils.NetworkClientBlockingOps$.recursivePoll$1(
> NetworkClientBlockingOps.scala:112)
>         at kafka.utils.NetworkClientBlockingOps$.kafka$utils$
> NetworkClientBlockingOps$$pollUntil$extension(NetworkClientBlockingOps.
> scala:120)
>         at kafka.utils.NetworkClientBlockingOps$.blockingReady$extension(
> NetworkClientBlockingOps.scala:59)
>         at kafka.server.ReplicaFetcherThread.sendRequest(
> ReplicaFetcherThread.scala:239)
>         at kafka.server.ReplicaFetcherThread.fetch(
> ReplicaFetcherThread.scala:229)
>         at kafka.server.ReplicaFetcherThread.fetch(
> ReplicaFetcherThread.scala:42)
>         at kafka.server.AbstractFetcherThread.processFetchRequest(
> AbstractFetcherThread.scala:107)
>         at kafka.server.AbstractFetcherThread.doWork(
> AbstractFetcherThread.scala:98)
>         at kafka.utils.ShutdownableThread.run(ShutdownableThread.scala:63)
> [2016-09-01 01:26:18,198] WARN [ReplicaFetcherThread-0-3], Error in fetch
> kafka.server.ReplicaFetcherThread$FetchRequest@5adea8fb (kafka.server.
> ReplicaFetcherThread)
> java.io.IOException: Connection to psaq3-wc.sys.comcast.net:61616 (id: 3
> rack: null) failed
>         at kafka.utils.NetworkClientBlockingOps$$anonfun$blockingReady$
> extension$2.apply(NetworkClientBlockingOps.scala:63)
>         at kafka.utils.NetworkClientBlockingOps$$anonfun$blockingReady$
> extension$2.apply(NetworkClientBlockingOps.scala:59)
>         at kafka.utils.NetworkClientBlockingOps$.recursivePoll$1(
> NetworkClientBlockingOps.scala:112)
>         at kafka.utils.NetworkClientBlockingOps$.kafka$utils$
> NetworkClientBlockingOps$$pollUntil$extension(NetworkClientBlockingOps.
> scala:120)
>         at kafka.utils.NetworkClientBlockingOps$.blockingReady$extension(
> NetworkClientBlockingOps.scala:59)
>         at kafka.server.ReplicaFetcherThread.sendRequest(
> ReplicaFetcherThread.scala:239)
>         at kafka.server.ReplicaFetcherThread.fetch(
> ReplicaFetcherThread.scala:229)
>         at kafka.server.ReplicaFetcherThread.fetch(
> ReplicaFetcherThread.scala:42)
>         at kafka.server.AbstractFetcherThread.processFetchRequest(
> AbstractFetcherThread.scala:107)
>         at kafka.server.AbstractFetcherThread.doWork(
> AbstractFetcherThread.scala:98)
>         at kafka.utils.ShutdownableThread.run(ShutdownableThread.scala:63)
> [2016-09-01 01:26:20,223] WARN [ReplicaFetcherThread-0-3], Error in fetch
> kafka.server.ReplicaFetcherThread$FetchRequest@4c159cc3 (kafka.server.
> ReplicaFetcherThread)
> java.io.IOException: Connection to psaq3-wc.sys.comcast.net:61616 (id: 3
> rack: null) failed
>         at kafka.utils.NetworkClientBlockingOps$$anonfun$blockingReady$
> extension$2.apply(NetworkClientBlockingOps.scala:63)
>         at kafka.utils.NetworkClientBlockingOps$$anonfun$blockingReady$
> extension$2.apply(NetworkClientBlockingOps.scala:59)
>         at kafka.utils.NetworkClientBlockingOps$.recursivePoll$1(
> NetworkClientBlockingOps.scala:112)
>         at kafka.utils.NetworkClientBlockingOps$.kafka$utils$
> NetworkClientBlockingOps$$pollUntil$extension(NetworkClientBlockingOps.
> scala:120)
>         at kafka.utils.NetworkClientBlockingOps$.blockingReady$extension(
> NetworkClientBlockingOps.scala:59)
>         at kafka.server.ReplicaFetcherThread.sendRequest(
> ReplicaFetcherThread.scala:239)
>         at kafka.server.ReplicaFetcherThread.fetch(
> ReplicaFetcherThread.scala:229)
>         at kafka.server.ReplicaFetcherThread.fetch(
> ReplicaFetcherThread.scala:42)
>         at kafka.server.AbstractFetcherThread.processFetchRequest(
> AbstractFetcherThread.scala:107)
>         at kafka.server.AbstractFetcherThread.doWork(
> AbstractFetcherThread.scala:98)
>         at kafka.utils.ShutdownableThread.run(ShutdownableThread.scala:63)
> [2016-09-01 01:26:22,246] WARN [ReplicaFetcherThread-0-3], Error in fetch
> kafka.server.ReplicaFetcherThread$FetchRequest@611ed1e9 (kafka.server.
> ReplicaFetcherThread)
> java.io.IOException: Connection to psaq3-wc.sys.comcast.net:61616 (id: 3
> rack: null) failed
>         at kafka.utils.NetworkClientBlockingOps$$anonfun$blockingReady$
> extension$2.apply(NetworkClientBlockingOps.scala:63)
>         at kafka.utils.NetworkClientBlockingOps$$anonfun$blockingReady$
> extension$2.apply(NetworkClientBlockingOps.scala:59)
>         at kafka.utils.NetworkClientBlockingOps$.recursivePoll$1(
> NetworkClientBlockingOps.scala:112)
>         at kafka.utils.NetworkClientBlockingOps$.kafka$utils$
> NetworkClientBlockingOps$$pollUntil$extension(NetworkClientBlockingOps.
> scala:120)
>         at kafka.utils.NetworkClientBlockingOps$.blockingReady$extension(
> NetworkClientBlockingOps.scala:59)
>         at kafka.server.ReplicaFetcherThread.sendRequest(
> ReplicaFetcherThread.scala:239)
>         at kafka.server.ReplicaFetcherThread.fetch(
> ReplicaFetcherThread.scala:229)
>         at kafka.server.ReplicaFetcherThread.fetch(
> ReplicaFetcherThread.scala:42)
>         at kafka.server.AbstractFetcherThread.processFetchRequest(
> AbstractFetcherThread.scala:107)
>         at kafka.server.AbstractFetcherThread.doWork(
> AbstractFetcherThread.scala:98)
>         at kafka.utils.ShutdownableThread.run(ShutdownableThread.scala:63)
> [2016-09-01 01:26:22,736] INFO [ReplicaFetcherManager on broker 4] Removed
> fetcher for partitions [TEST3,0] (kafka.server.ReplicaFetcherManager)
> [2016-09-01 01:26:22,752] INFO [ReplicaFetcherThread-0-3], Shutting down
> (kafka.server.ReplicaFetcherThread)
> [2016-09-01 01:26:22,755] INFO [ReplicaFetcherThread-0-3], Stopped
> (kafka.server.ReplicaFetcherThread)
> [2016-09-01 01:26:22,756] INFO [ReplicaFetcherThread-0-3], Shutdown
> completed (kafka.server.ReplicaFetcherThread)
> [2016-09-01 01:26:48,025] INFO Creating /controller (is it secure? false)
> (kafka.utils.ZKCheckedEphemeral)
> [2016-09-01 01:26:48,034] INFO Result of znode creation is: OK
> (kafka.utils.ZKCheckedEphemeral)
> [2016-09-01 01:26:48,035] INFO 4 successfully elected as leader
> (kafka.server.ZookeeperLeaderElector)
> [2016-09-01 01:26:48,726] INFO New leader is 4 (kafka.server.
> ZookeeperLeaderElector$LeaderChangeListener)
> [2016-09-01 01:26:54,837] INFO Partition [TEST3,0] on broker 4: Shrinking
> ISR for partition [TEST3,0] from 4,5,6,1 to 4,5,6 (kafka.cluster.Partition)
> [2016-09-01 01:33:04,926] INFO [Group Metadata Manager on Broker 4]:
> Removed 0 expired offsets in 1 milliseconds. (kafka.coordinator.
> GroupMetadataManager)
> [2016-09-01 01:43:04,926] INFO [Group Metadata Manager on Broker 4]:
> Removed 0 expired offsets in 0 milliseconds. (kafka.coordinator.
> GroupMetadataManager)
> [2016-09-01 01:53:04,926] INFO [Group Metadata Manager on Broker 4]:
> Removed 0 expired offsets in 1 milliseconds. (kafka.coordinator.
> GroupMetadataManager)
> [2016-09-01 02:03:04,926] INFO [Group Metadata Manager on Broker 4]:
> Removed 0 expired offsets in 0 milliseconds. (kafka.coordinator.
> GroupMetadataManager)
> [2016-09-01 02:13:04,928] INFO [Group Metadata Manager on Broker 4]:
> Removed 0 expired offsets in 1 milliseconds. (kafka.coordinator.
> GroupMetadataManager)
> [2016-09-01 02:23:04,926] INFO [Group Metadata Manager on Broker 4]:
> Removed 0 expired offsets in 1 milliseconds. (kafka.coordinator.
> GroupMetadataManager)
> [2016-09-01 02:33:04,926] INFO [Group Metadata Manager on Broker 4]:
> Removed 0 expired offsets in 1 milliseconds. (kafka.coordinator.
> GroupMetadataManager)
>
>
> Why it's trying to connect the node3 of my local datacenter and it's
> throwing IOException.
>
> Thanks
> Achintya
>
> -----Original Message-----
> From: Jason Gustafson [mailto:jason@confluent.io]
> Sent: Wednesday, August 31, 2016 10:26 PM
> To: users@kafka.apache.org
> Cc: dev@kafka.apache.org
> Subject: Re: Kafka consumers unable to process message
>
> Hi Achintya,
>
> Just to clarify, you did not take down either of the zookeepers in this
> test, right? Having only two zookeepers in the ensemble would mean that if
> either one of them failed, zookeeper wouldn't be able to reach quorum.
>
> I'm not entirely sure why this would happen. One possibility is that the
> consumer is failing to find the new coordinator, which might happen if all
> the replicas for one of the __consumer_offsets partitions were located in
> the "failed" datacenter. Perhaps you can enable DEBUG logging and post some
> logs so we can see what it's actually doing during poll().
>
> By the way, I noticed that your consumer configuration settings seem a
> little mixed up. The new consumer doesn't actually communicate with
> Zookeeper, so there's no need for those settings. And you don't need to
> include the "offsets.storage" option since Kafka is the only choice. Also,
> I don't think "consumer.timeout.ms" is an option.
>
> -Jason
>
>
> On Wed, Aug 31, 2016 at 6:43 PM, Ghosh, Achintya (Contractor) <
> Achintya_Ghosh@comcast.com> wrote:
>
> > Hi Jason,
> >
> > Thanks for your response.
> >
> > I know that is a known issue and I resolved it calling wakeup method
> > by another thread. But here my problem is different, let me explain ,
> > it's very basic
> >
> > I created one cluster with 6 nodes( 3 from one datacenter and 3 from
> > another(remote) datacenter and kept replication factor 6 with 2
> > zookeeper servers one from each datacenter ). Now I brought down all 3
> > nodes of my local datacenter and produced few messages and I see
> > producer is working fine even my local data center nodes are down. It
> > successfully writes the messages to other data center nodes. But when
> > I'm trying to consume the messages the consumer.poll method gets stuck
> > as my local datacenter is down though other datacenter's nodes are up.
> >
> > My question is as the data has been written successfully to other
> > datacenter why consumer part is not working?
> >
> > Here is my Producer settings:
> >
> > props.put("bootstrap.servers", "psaq1-wc.sys.comcast.net:61616,
> > psaq2-wc.sys.comcast.net:61616,psaq3-wc.sys.comcast.net:61616,psaq1-ab.
> > sys.comcast.net:61617,psaq2-ab.sys.comcast.net:61617,psaq3
> > -ab.sys.comcast.net:61617");
> > props.put("acks", "1");
> > props.put("max.block.ms", 1000);
> > props.put("key.serializer", "org.apache.kafka.common.serialization.
> > StringSerializer");
> > props.put("value.serializer", "com.comcast.ps.kafka.object.
> > CustomMessageSer");
> >
> > and here is Consumer settings:
> >
> > props.put("group.id", "app-consumer");
> >                 props.put("enable.auto.commit", "false");
> >                 props.put("auto.offset.reset", "earliest");
> >                 props.put("auto.commit.interval.ms", "500");
> >                 props.put("session.timeout.ms", "120000");
> >                 props.put("consumer.timeout.ms", "10000");
> >                 props.put("zookeeper.session.timeout.ms", "120000");
> >                 props.put("zookeeper.connection.timeout.ms", "60000");
> >                 props.put("offsets.storage","kafka");
> >                 props.put("request.timeout.ms", "150000");
> >                 props.put("bootstrap.servers", "psaq1-wc.sys.comcast.net
> :
> > 61616,psaq2-wc.sys.comcast.net:61616,psaq3-wc.sys.comcast.net:61616,
> > psaq1-ab.sys.comcast.net:61617,psaq2-ab.sys.comcast.net:61617,psaq3
> > -ab.sys.comcast.net:61617");
> >                 props.put("key.deserializer", "org.apache.kafka.common.
> > serialization.StringDeserializer");
> >                 props.put("value.deserializer",
> > "com.comcast.ps.kafka.object.CustomMessageDeSer");
> >
> > Is it because of consumer is not able to get the broker metadata if it
> > is trying to connect other datacenter's zookeeper server? I tried with
> > to increate the zookeeper session timeout and connection time out but no
> luck.
> >
> > Please help on this.
> > Thanks
> > Achintya
> >
> >
> > -----Original Message-----
> > From: Jason Gustafson [mailto:jason@confluent.io]
> > Sent: Wednesday, August 31, 2016 4:05 PM
> > To: users@kafka.apache.org
> > Cc: dev@kafka.apache.org
> > Subject: Re: Kafka consumers unable to process message
> >
> > Hi Achintya,
> >
> > We have a JIRA for this problem: https://issues.
> > apache.org/jira/browse/KAFKA-3834. Do you expect the client to raise
> > an exception in this case or do you just want to keep it from blocking
> > indefinitely? If the latter, you could escape the poll from another
> > thread using wakeup().
> >
> > Thanks,
> > Jason
> >
> > On Wed, Aug 31, 2016 at 12:11 PM, Ghosh, Achintya (Contractor) <
> > Achintya_Ghosh@comcast.com> wrote:
> >
> > > Hi there,
> > >
> > > Kafka consumer gets stuck at consumer.poll() method if my current
> > > datacenter is down and replicated messages are in remote datacenter.
> > >
> > > How to solve that issue?
> > >
> > > Thanks
> > > Achintya
> > >
> >
>

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