文档:
Balancing Replicas Across Racks
The rack awareness feature spreads replicas of the same partition across different racks. This extends the guarantees Kafka provides for broker-failure to cover rack-failure, limiting the risk of data loss should all the brokers on a rack fail at once. The feature can also be applied to other broker groupings such as availability zones in EC2. You can specify that a broker belongs to a particular rack by adding a property to the broker config:1 | broker.rack=my-rack-id |
相关参数:
broker.rack | Rack of the broker. This will be used in rack aware replication assignment for fault tolerance. Examples: RACK1 , us-east-1d | string | null | medium |
==================================================================================
一、测试方案
1、节点: 172.28.1.114 3 broker.rack=yanjiao
172.28.1.88 4 broker.rack=yanjiao
172.28.1.87 5 broker.rack=ucloud
172.28.1.89 6 broker.rack=ucloud
注意:不同机架位的节点数应保持平衡,否则负载分布将发生倾斜,节点数较少的机架位节点会获得更多的负载;(参加分配策略)
2、以 topic zs_invoice测试
{"topics": [{"topic": "zs_invoice"}],
"version":1
}
3、生成分配策略:
bin/kafka-reassign-partitions.sh --zookeeper 172.28.1.89:2181 --topics-to-move-json-file topics-to-move.json --broker-list "3,4,5,6" --generate
注意:此时生成分配策略时候,会先依次对broker.id进行排序(机架感知配置生效)ex 3,5,4,6 ,再此基础上在进行分配策略;确保partions副本分布在不同的机架位;
4、执行分配策略
bin/kafka-reassign-partitions.sh --zookeeper 172.28.1.89:2181 --reassignment-json-file expand-cluster-reassignment.json --execute -throttle 60000000
5、确认完成并移除限速
bin/kafka-reassign-partitions.sh --zookeeper 172.28.1.89:2181 --reassignment-json-file expand-cluster-reassignment.json --verify
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