在 Kafka 中读取消息时重新平衡问题 [英] Rebalancing issue while reading messages in Kafka

问题描述

我正在尝试阅读有关 Kafka 主题的消息，但无法阅读.该进程在一段时间后被终止，没有读取任何消息.

I am trying to read messages on Kafka topic, but I am unable to read it. The process gets killed after sometime, without reading any messages.

这是我得到的重新平衡错误:

Here is the rebalancing error which I get:

[2014-03-21 10:10:53,215] ERROR Error processing message, stopping consumer:  (kafka.consumer.ConsoleConsumer$)
kafka.common.ConsumerRebalanceFailedException: topic-1395414642817-47bb4df2 can't rebalance after 4 retries
    at kafka.consumer.ZookeeperConsumerConnector$ZKRebalancerListener.syncedRebalance(ZookeeperConsumerConnector.scala:428)
    at kafka.consumer.ZookeeperConsumerConnector.kafka$consumer$ZookeeperConsumerConnector$$reinitializeConsumer(ZookeeperConsumerConnector.scala:718)
    at kafka.consumer.ZookeeperConsumerConnector$WildcardStreamsHandler.<init>(ZookeeperConsumerConnector.scala:752)
    at kafka.consumer.ZookeeperConsumerConnector.createMessageStreamsByFilter(ZookeeperConsumerConnector.scala:142)
    at kafka.consumer.ConsoleConsumer$.main(ConsoleConsumer.scala:196)
    at kafka.consumer.ConsoleConsumer.main(ConsoleConsumer.scala)
Consumed 0 messages

我尝试运行 ConsumerOffsetChecker，这是我得到的错误.我不知道如何解决这个问题.任何人，有什么想法吗?

I tried to run ConsumerOffsetChecker, and this is the error which I get. I have no clue whatsoever, how to resolve this. Anybody, any idea?

./kafka-run-class.sh kafka.tools.ConsumerOffsetChecker --zkconnect localhost:9092 --topic mytopic --group  topic_group
Group           Topic                          Pid Offset          logSize         Lag             Owner
Exception in thread "main" org.I0Itec.zkclient.exception.ZkNoNodeException: org.apache.zookeeper.KeeperException$NoNodeException: KeeperErrorCode = NoNode for /consumers/
        at org.I0Itec.zkclient.exception.ZkException.create(ZkException.java:47)
        at org.I0Itec.zkclient.ZkClient.retryUntilConnected(ZkClient.java:685)
        at org.I0Itec.zkclient.ZkClient.readData(ZkClient.java:766)
        at org.I0Itec.zkclient.ZkClient.readData(ZkClient.java:761)
        at kafka.utils.ZkUtils$.readData(ZkUtils.scala:459)
        at kafka.tools.ConsumerOffsetChecker$.kafka$tools$ConsumerOffsetChecker$$processPartition(ConsumerOffsetChecker.scala:59)
        at kafka.tools.ConsumerOffsetChecker$$anonfun$kafka$tools$ConsumerOffsetChecker$$processTopic$1.apply$mcVI$sp(ConsumerOffsetChecker.scala:89)
        at kafka.tools.ConsumerOffsetChecker$$anonfun$kafka$tools$ConsumerOffsetChecker$$processTopic$1.apply(ConsumerOffsetChecker.scala:89)
        at kafka.tools.ConsumerOffsetChecker$$anonfun$kafka$tools$ConsumerOffsetChecker$$processTopic$1.apply(ConsumerOffsetChecker.scala:89)
        at scala.collection.LinearSeqOptimized$class.foreach(LinearSeqOptimized.scala:61)
        at scala.collection.immutable.List.foreach(List.scala:45)
        at kafka.tools.ConsumerOffsetChecker$.kafka$tools$ConsumerOffsetChecker$$processTopic(ConsumerOffsetChecker.scala:88)
        at kafka.tools.ConsumerOffsetChecker$$anonfun$main$3.apply(ConsumerOffsetChecker.scala:153)
        at kafka.tools.ConsumerOffsetChecker$$anonfun$main$3.apply(ConsumerOffsetChecker.scala:153)
        at scala.collection.LinearSeqOptimized$class.foreach(LinearSeqOptimized.scala:61)
        at scala.collection.immutable.List.foreach(List.scala:45)
        at kafka.tools.ConsumerOffsetChecker$.main(ConsumerOffsetChecker.scala:152)
        at kafka.tools.ConsumerOffsetChecker.main(ConsumerOffsetChecker.scala)
Caused by: org.apache.zookeeper.KeeperException$NoNodeException: KeeperErrorCode = NoNode for /consumers/
        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:927)
        at org.apache.zookeeper.ZooKeeper.getData(ZooKeeper.java:956)
        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)
        ... 16 more

推荐答案

我最近也遇到了类似的问题.您可以尝试将消费者配置 rebalance.backoff.ms 和 zookeeper.session.timeout.ms 增加到大约 5-10 秒.

I have got similar problems recently. You can try to increase the consumer configurations rebalance.backoff.ms and zookeeper.session.timeout.ms to about 5-10 seconds.

第一个参数告诉 kafka 在重试重新平衡之前等待更多时间.第二个告诉 kafka 在尝试连接到 zookeeper 时要更加耐心.

The first parameter tell kafka to wait more before retrying rebalance. The second one tell kafka to be more patient while trying to connect to zookeeper.

其他配置选项可以在官方文档中找到.

Other configuration options can be found on the official documentation.

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