如何将leader语言 - 1的分区移动到另一个代理

Question

假设所有具有分区leader和副本的节点都崩溃了，并且节点不可恢复。

如何选择另一个Kafka broker作为该分区的leader ?(我很好与数据丢失)

我尝试了"kafka-preferred-replica-election.sh"one_answers"kafka- reassignment -partitions.sh"但是没有成功。

设置:

• 双节点kafka集群，代理id为10和11。
• 主题"test"，复制因子为1，分区为1。Broker 11是主题"test"分区0的领导者
• Broker 11崩溃
Kafka版本- kafka_2.11-0.10.1.0

主题描述

Topic:test  PartitionCount:1    ReplicationFactor:1 Configs:
Topic: test Partition: 0    Leader: -1  Replicas: 11    Isr:

kafka-reassign-partitions.sh输出:

bin/kafka-reassign-partitions.sh --zookeeper myvm:2181 --reassignment-json-file manual-assignment.json --execute
Partitions reassignment failed due to The proposed assignment contains non-existent partitions: List([test,10])
kafka.common.AdminCommandFailedException: The proposed assignment contains non-existent partitions: List([test,10])
    at kafka.admin.ReassignPartitionsCommand$.parseAndValidate(ReassignPartitionsCommand.scala:201)
    at kafka.admin.ReassignPartitionsCommand$.executeAssignment(ReassignPartitionsCommand.scala:153)
    at kafka.admin.ReassignPartitionsCommand$.executeAssignment(ReassignPartitionsCommand.scala:149)
    at kafka.admin.ReassignPartitionsCommand$.main(ReassignPartitionsCommand.scala:46)
    at kafka.admin.ReassignPartitionsCommand.main(ReassignPartitionsCommand.scala)
cat manual-assignment.json
{
 "partitions":
  [
    {"topic": "test", "partition": 10, "replicas": [10]}
  ],
  "version":1
}

kafka-preferred-replica-election.sh

bin/kafka-preferred-replica-election.sh --zookeeper myvm:2181 --path-to-json-file topicPartitionList.json
[2016-11-08 03:27:01,993] ERROR Skipping preferred replica leader election for partition [test,10] since it doesn't exist (kafka.admin.PreferredReplicaLeaderElectionCommand)
Successfully started preferred replica election for partitions Set([test,10])
cat topicPartitionList.json
{
 "partitions":
  [
    {"topic": "test", "partition": 10}
  ]
}

Answer 1

Kafka只从ISR和分配的副本中选举leader(当启用不洁leader选举时)。在复制因子设置为1的情况下，在领导代理崩溃后，ISR中没有剩余的代理。没有候选人可以当选为新的领导人，所以这是一个设计。