Question

我有3个Kafka代理的集群，所有主题的复制因子均为3。自从最近几天以来，我一直面临这个问题，即使Kafka在所有3台服务器上运行，消费者和生产者在获得响应时（一天几次）都被卡住了，直到我检查代理日志（“连接到0的连接已断开，然后读取罪魁祸首节点（在本例中为第一个节点），然后在该节点上重新启动Zookeeper和代理。

根据日志，由于重新平衡，这种情况正在发生。

我将min.insync.replicas减少到2，但这没有帮助。

服务器日志0（第一个节点）在这种情况下会导致问题：

Member consumer-3-8e370c0e-4a21-4dec-8301-18ce6aaf71d9 in group banner has failed, removing it from the group (kafka.coordinator.group.GroupCoordinator)
  Preparing to rebalance group banner in state PreparingRebalance with old generation 2570 (__consumer_offsets-5) (reason: removing member consumer-3-8e370c0e-4a21-4dec-8301-18ce6aaf71d9 on heartbeat expiration) (kafka.coordinator.group.GroupCoordinator)
  Member consumer-4-da57dad3-6825-4a6d-ac93-82a29f72a3dc in group banner has failed, removing it from the group (kafka.coordinator.group.GroupCoordinator)
  Member consumer-2-812b613b-3409-42e7-baf8-8b32df4e2fa4 in group banner has failed, removing it from the group (kafka.coordinator.group.GroupCoordinator)
  Member consumer-2-d03f0417-4e0f-4ab0-90c6-12b17a6354d7 in group poster has failed, removing it from the group (kafka.coordinator.group.GroupCoordinator)
  Preparing to rebalance group poster in state PreparingRebalance with old generation 191 (__consumer_offsets-9) (reason: removing member consumer-2-d03f0417-4e0f-4ab0-90c6-12b17a6354d7 on heartbeat expiration) (kafka.coordinator.group.GroupCoordinator)
  Group poster with generation 192 is now empty (__consumer_offsets-9) (kafka.coordinator.group.GroupCoordinator)
  Member rdkafka-fda5cec6-e121-4ab7-9650-83d391abc82d in group notification-test has failed, removing it from the group (kafka.coordinator.group.GroupCoordinator)
  Stabilized group notification-test generation 436 (__consumer_offsets-20) (kafka.coordinator.group.GroupCoordinator)
  Member consumer-5-eeb1b721-b52b-4b65-af70-e48a345d150f in group banner has failed, removing it from the group (kafka.coordinator.group.GroupCoordinator)
  Member consumer-4-889659e2-3c2f-4059-bf0c-45796f824443 in group banner has failed, removing it from the group (kafka.coordinator.group.GroupCoordinator)
  Member consumer-5-95a38999-6156-4a53-ac1f-1d51703956fd in group banner has failed, removing it from the group (kafka.coordinator.group.GroupCoordinator)
  Group banner with generation 2571 is now empty (__consumer_offsets-5) (kafka.coordinator.group.GroupCoordinator)
  Failed to write empty metadata for group poster: The group is rebalancing, so a rejoin is needed. (kafka.coordinator.group.GroupCoordinator)
  Failed to write empty metadata for group banner: The group is rebalancing, so a rejoin is needed. (kafka.coordinator.group.GroupCoordinator)
  Member consumer-5-e7a6af24-1f50-40cc-a593-cf8614e9d088 in group redemption has failed, removing it from the group (kafka.coordinator.group.GroupCoordinator)
  Preparing to rebalance group redemption in state PreparingRebalance with old generation 1373 (__consumer_offsets-27) (reason: removing member consumer-5-e7a6af24-1f50-40cc-a593-cf8614e9d088 on heartbeat expiration) (kafka.coordinator.group.GroupCoordinator)
  Member consumer-1-d89defb1-6637-48bc-ba16-b646c32d3849 in group redemption has failed, removing it from the group (kafka.coordinator.group.GroupCoordinator)
  Member consumer-4-c942542b-7c54-4656-a485-410278b936ec in group redemption has failed, removing it from the group (kafka.coordinator.group.GroupCoordinator)
  Member consumer-3-adfb6536-2fbc-4b39-9368-56b665db2c75 in group redemption has failed, removing it from the group (kafka.coordinator.group.GroupCoordinator)
[2019-05-19 13:22

其他经纪人的日志：

java.io.IOException: Connection to 0 was disconnected before the response was read
        at org.apache.kafka.clients.NetworkClientUtils.sendAndReceive(NetworkClientUtils.java:97)
        at kafka.server.ReplicaFetcherBlockingSend.sendRequest(ReplicaFetcherBlockingSend.scala:97)
        at kafka.server.ReplicaFetcherThread.fetchFromLeader(ReplicaFetcherThread.scala:190)
        at kafka.server.AbstractFetcherThread.kafka$server$AbstractFetcherThread$$processFetchRequest(AbstractFetcherThread.scala:241)
        at kafka.server.AbstractFetcherThread$$anonfun$maybeFetch$1.apply(AbstractFetcherThread.scala:130)
        at kafka.server.AbstractFetcherThread$$anonfun$maybeFetch$1.apply(AbstractFetcherThread.scala:129)
        at scala.Option.foreach(Option.scala:257)
        at kafka.server.AbstractFetcherThread.maybeFetch(AbstractFetcherThread.scala:129)
        at kafka.server.AbstractFetcherThread.doWork(AbstractFetcherThread.scala:111)
        at kafka.utils.ShutdownableThread.run(ShutdownableThread.scala:82)

消费者服务记录：

|FAIL|rdkafka#consumer-2| [thrd:m-data-kaf006.c-14cba.internal:9092/2]: m-data-kaf006.c.internal:9092/2: 3 request(s) timed out: disconnect

无法找到解决方案。

Kafka版本：2.1.0

Answer 1

我发现此Kafka版本（2.1.0）中存在死锁问题： https://issues.apache.org/jira/browse/KAFKA-7802 在版本2.1.1和2.2.0中已解决

Answer 2

这是由于较旧的kafka版本存在问题。您需要将kafka升级到2.2.0、2.1.1，请在下面的基本jira问题中找到-https://issues.apache.org/jira/browse/KAFKA-7697

使用者和生产者失败，并显示错误：“在读取响应之前，已断开与0的连接”

2 个答案: