kafka緩存zkVersion不等於zookeeper經紀人沒有恢復的情況

Question

我有一個有3個經紀人的kafka集群。 我最近開始面臨問題，經紀人走出集群，生產者/消費者拋出領導者沒有可用的錯誤。

在檢查日志時，我看到以下一系列事件：

//許多副本提取程序線程啟動/停止

[2017-10-09 14:48:50,600] INFO [ReplicaFetcherManager on broker 6] Removed fetcher for partitions

[2017-10-09 14:48:50,608] INFO [ReplicaFetcherThread-0-7], Shutting down (kafka.server.ReplicaFetcherThread)
[2017-10-09 14:48:50,918] INFO [ReplicaFetcherThread-0-7], Stopped  (kafka.server.ReplicaFetcherThread)
[2017-10-09 14:48:50,918] INFO [ReplicaFetcherThread-0-7], Shutdown completed (kafka.server.ReplicaFetcherThread)

//不斷擴展/縮小ISR

[2017-10-09 14:48:51,037] INFO Partition [__consumer_offsets,8] on broker 6: Expanding ISR for partition __consumer_offsets-8 from 6,8 to 6,8,7 (kafka.cluster.Partition)
[2017-10-09 14:48:51,038] INFO Partition [__consumer_offsets,35] on broker 6: Expanding ISR for partition __consumer_offsets-35 from 6,8 to 6,8,7 (kafka.cluster.Partition)

[2017-10-09 14:49:01,702] INFO Partition [t1,1] on broker 6: Shrinking ISR for partition [t1,1] from 6,7 to 6 (kafka.cluster.Partition)
[2017-10-09 14:49:01,702] INFO Partition [__consumer_offsets,41] on broker 6: Shrinking ISR for partition [__consumer_offsets,41] from 6,8,7 to 6,8 (kafka.cluster.Partition)

//重新注冊經紀人和領導人的連任

[2017-10-09 14:51:54,380] INFO re-registering broker info in ZK for broker 6

[2017-10-09 14:51:54,405] INFO New leader is 7 (kafka.server.ZookeeperLeaderElector$LeaderChangeListener)

// ControllerMovedException錯誤

[2017-10-09 14:56:39,746] ERROR [KafkaApi-6] Error when handling request.. org.apache.kafka.common.errors.ControllerMovedException: Broker 6 received update metadata request with correlation id 59 from an old controlle
r 7 with epoch 301. Latest known controller epoch is 302

[2017-10-09 14:57:59,210] INFO re-registering broker info in ZK for broker 6 (kafka.server.KafkaHealthcheck$SessionExpireListener)
[2017-10-09 14:57:59,210] INFO Creating /brokers/ids/6 (is it secure? false) (kafka.utils.ZKCheckedEphemeral)
[2017-10-09 14:57:59,213] INFO Result of znode creation is: OK (kafka.utils.ZKCheckedEphemeral)
[2017-10-09 14:57:59,213] INFO Registered broker 6 at path /brokers/ids/6 with addresses: EndPoint(kafka03,9092,ListenerName(PLAIN
TEXT),PLAINTEXT) (kafka.utils.ZkUtils)
[2017-10-09 14:57:59,213] INFO done re-registering broker (kafka.server.KafkaHealthcheck$SessionExpireListener)
[2017-10-09 14:57:59,213] INFO Subscribing to /brokers/topics path to watch for new topics (kafka.server.KafkaHealthcheck$SessionExpireListener
)
[2017-10-09 14:57:59,224] INFO New leader is 7 (kafka.server.ZookeeperLeaderElector$LeaderChangeListener)
[2017-10-09 14:58:11,697] INFO Partition [testing1,2] on broker 6: Shrinking ISR for partition [testing1,2] from 6,8 to 6 (kafka.cluster.Partit
ion)
[2017-10-09 14:58:11,700] INFO Partition [testing1,2] on broker 6: Cached zkVersion [199] not equal to that in zookeeper, skip updating ISR (ka
fka.cluster.Partition)

然后這些錯誤發生在循環中，並且群集無法恢復

[2017-10-09 16:17:26,769] INFO Partition [__consumer_offsets,14] on broker 6: Shrinking ISR for partition [__consumer_offsets,14] from 7,6,8 to 7,6 (kafka.cluster.Partition)
[2017-10-09 16:17:26,771] INFO Partition [__consumer_offsets,14] on broker 6: Cached zkVersion [306] not equal to that in zookeeper, skip updating ISR (kafka.cluster.Partition)

在客戶端，我收到Leader not available錯誤。

尚不清楚為什么集群進入這個無效狀態..任何想法？

Answer 1

這個問題在KAFKA-2729中已知並被跟蹤，但直到現在才解決。 據我所知，這種情況發生在由於最大流量導致的大延遲或在短時間內出現短暫網絡中斷的網絡上。 唯一的解決方案（afaik）是重啟所有經紀人。

Answer 2

1. 殺死當前的控制器，然后會有另一個控制器當選。

2. 重新啟動您在步驟1中殺死的上一個控制器

分區國家將得到修復