如何移动一个分区与领导-1到另一个代理？

Question

假设所有具有分区的前导和副本的节点都崩溃，并且节点不可恢复。

如何选举另一位Kafka经纪人作为该分区的领导人？（我对数据丢失感到满意）

我尝试了“kafka preferred replica election.sh”和“kafka reassign partitions.sh”，但没有成功。

设置：

• 两个节点kafka集群，代理ID为10和11。
• 具有副本因子1和分区1的主题测试。Broker 11是主题测试分区0的领导者
• 11号经纪人倒下了
• 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更喜欢复制品选举。嘘

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仅从ISR和指定副本中选举领导人（启用不干净领导人选举时）。对于您的情况，当复制因子设置为1时，在leader broker崩溃后，ISR中没有任何代理。没有候选人可以当选为新的领导人，所以这是设计。