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From Joe Stein <crypt...@gmail.com>
Subject Re: SimpleConsumer woes
Date Wed, 04 Jan 2012 17:35:01 GMT
On Tue, Jan 3, 2012 at 8:32 PM, Jun Rao <junrao@gmail.com> wrote:

> Joe,
>
> It seems that you are using the ZK-based consumer, which uses
> SimpleConsumer under the cover. The exception in SimpleConsumer seems to be
> caused by a broker failure. The ZK exception you saw is typically caused by
> ZK session expiration. Do you see that?


yes


> If the ZK session only expires
> occasionally, it is not a problem as long as rebalance completes in the end
> (you should see "Consumer ... selected partitions"). If there are constant
> ZK session expirations, then rebalance may not complete.


yup they are happening a lot, consistent


> ZK session
> expiration is typically caused by GC.
>

any way to stop or prevent my issue? =8^)


>
> Also, which version of Kafka are you using? Which patch did you apply?
>
>
I am running off of trunk, I applied
https://issues.apache.org/jira/browse/KAFKA-229 (now on trunk also) just so
i could see the error in multifetch


> Thanks,
>
> Jun
>
> On Tue, Jan 3, 2012 at 2:25 PM, Joe Stein <cryptcom@gmail.com> wrote:
>
> > So my SimpleConsumer woes seem to continue :( I am thinking of not using
> a
> > SimpleConsumer implementation anymore and rolling my own unless there is
> > another option or a fix here I can implement?
> >
> > So, after applying my patch (to see this error) this is the error I am
> > getting after some time goes by of consuming my stream
> >
> > 2012-01-03 15:04:28,871 INFO
> > ZkClient-EventThread-763-zoo1:2181,zoo2:2181,zoo3:2181
> > kafka.consumer.ZookeeperConsumerConnector - Consumer
> > test-consumer-group_doozer selected partitions : controserverlogs:0-0:
> > fetched offset = 137564195795: consumed offset = 137564195795
> > 2012-01-03 15:04:28,871 INFO FetchRunnable-0
> kafka.consumer.SimpleConsumer
> > - multifetch reconnect due to
> > java.nio.channels.ClosedByInterruptException
> > at
> >
> >
> java.nio.channels.spi.AbstractInterruptibleChannel.end(AbstractInterruptibleChannel.java:184)
> > at sun.nio.ch.SocketChannelImpl.read(SocketChannelImpl.java:263)
> > at kafka.utils.Utils$.read(Utils.scala:497)
> > at
> >
> >
> kafka.network.BoundedByteBufferReceive.readFrom(BoundedByteBufferReceive.scala:67)
> > at kafka.network.Receive$class.readCompletely(Transmission.scala:55)
> > at
> >
> >
> kafka.network.BoundedByteBufferReceive.readCompletely(BoundedByteBufferReceive.scala:29)
> > at kafka.consumer.SimpleConsumer.getResponse(SimpleConsumer.scala:179)
> > at kafka.consumer.SimpleConsumer.liftedTree2$1(SimpleConsumer.scala:119)
> > at kafka.consumer.SimpleConsumer.multifetch(SimpleConsumer.scala:117)
> > at kafka.consumer.FetcherRunnable.run(FetcherRunnable.scala:61)
> >
> >
> > its does this frequently and if I leave it running if then eventually
> does
> > this (after starting back up and rebalancing)
> >
> > 2012-01-03 15:06:18,823 INFO
> > ZkClient-EventThread-763-zoo1:2181,zoo2:2181,zoo3:2181
> > kafka.consumer.ZookeeperConsumerConnector - begin rebalancing consumer
> > test-consumer-group_doozer try #0
> > 2012-01-03 15:06:18,825 INFO
> > ZkClient-EventThread-763-zoo1:2181,zoo2:2181,zoo3:2181
> > kafka.consumer.ZookeeperConsumerConnector - exception during rebalance
> > org.I0Itec.zkclient.exception.ZkNoNodeException:
> > org.apache.zookeeper.KeeperException$NoNodeException: KeeperErrorCode =
> > NoNode for /consumers/test-consumer-group/ids/test-consumer-group_doozer
> > at org.I0Itec.zkclient.exception.ZkException.create(ZkException.java:47)
> > at org.I0Itec.zkclient.ZkClient.retryUntilConnected(ZkClient.java:685)
> > at org.I0Itec.zkclient.ZkClient.readData(ZkClient.java:766)
> > at org.I0Itec.zkclient.ZkClient.readData(ZkClient.java:761)
> > at org.I0Itec.zkclient.ZkClient.readData(ZkClient.java:750)
> > at org.I0Itec.zkclient.ZkClient.readData(ZkClient.java:744)
> > at kafka.utils.ZkUtils$.readData(ZkUtils.scala:161)
> > at
> >
> >
> kafka.consumer.ZookeeperConsumerConnector$ZKRebalancerListener.kafka$consumer$ZookeeperConsumerConnector$ZKRebalancerListener$$getTopicCount(ZookeeperConsumerConnector.scala:414)
> > at
> >
> >
> kafka.consumer.ZookeeperConsumerConnector$ZKRebalancerListener.kafka$consumer$ZookeeperConsumerConnector$ZKRebalancerListener$$rebalance(ZookeeperConsumerConnector.scala:453)
> > at
> >
> >
> kafka.consumer.ZookeeperConsumerConnector$ZKRebalancerListener$$anonfun$syncedRebalance$1.apply$mcVI$sp(ZookeeperConsumerConnector.scala:430)
> > at scala.collection.immutable.Range.foreach$mVc$sp(Range.scala:75)
> > at
> >
> >
> kafka.consumer.ZookeeperConsumerConnector$ZKRebalancerListener.syncedRebalance(ZookeeperConsumerConnector.scala:426)
> > at
> >
> >
> kafka.consumer.ZookeeperConsumerConnector$ZKRebalancerListener.handleChildChange(ZookeeperConsumerConnector.scala:369)
> > at org.I0Itec.zkclient.ZkClient$7.run(ZkClient.java:568)
> > at org.I0Itec.zkclient.ZkEventThread.run(ZkEventThread.java:71)
> > Caused by: org.apache.zookeeper.KeeperException$NoNodeException:
> > KeeperErrorCode = NoNode for
> > /consumers/test-consumer-group/ids/test-consumer-group_doozer
> > at org.apache.zookeeper.KeeperException.create(KeeperException.java:102)
> > at org.apache.zookeeper.KeeperException.create(KeeperException.java:42)
> > at org.apache.zookeeper.ZooKeeper.getData(ZooKeeper.java:921)
> > at org.apache.zookeeper.ZooKeeper.getData(ZooKeeper.java:950)
> > at org.I0Itec.zkclient.ZkConnection.readData(ZkConnection.java:103)
> > at org.I0Itec.zkclient.ZkClient$9.call(ZkClient.java:770)
> > at org.I0Itec.zkclient.ZkClient$9.call(ZkClient.java:766)
> > at org.I0Itec.zkclient.ZkClient.retryUntilConnected(ZkClient.java:675)
> >
> >
> >
> > granted this could be all about my implementation it is based largely on
> > the "SimpleConsumerShell" as I was not sure of any other starting point
> > without a lot of my own heavy lifting and just doing it myself (which
> seems
> > to have a lot involved which is fine then something like
> > https://issues.apache.org/jira/browse/KAFKA-232 will be important too
> for
> > me something I looked at today need to dig more)
> >
> > thoughts? thanks? what are other folks doing?  is anyone using the
> > SimpleConsumer successfully?
> >
> > --
> >
> > /*
> > Joe Stein
> > http://www.linkedin.com/in/charmalloc
> > Twitter: @allthingshadoop <http://www.twitter.com/allthingshadoop>
> > */
> >
>



-- 

/*
Joe Stein
http://www.linkedin.com/in/charmalloc
Twitter: @allthingshadoop <http://www.twitter.com/allthingshadoop>
*/

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