kafka其中一台节点坏掉的迁移或者数据迁移

kafka版本：适用于目前2.0以下

第一步：

假如有一个topic叫做test，当前topic的详情是这样的：

[cdh@cdh1 kafka_2.11-1.0.1]$ bin/kafka-topics.sh --topic test --describe --zookeeper hadoop01:2181
Topic:test      PartitionCount:3        ReplicationFactor:2     Configs:
        Topic: test     Partition: 0    Leader: 2       Replicas: 2,0   Isr: 2,0
        Topic: test     Partition: 1    Leader: 0       Replicas: 0,1   Isr: 0,1
        Topic: test     Partition: 2    Leader: 1       Replicas: 1,2   Isr: 1,2

　　

现在想把其中一台节点换掉，或者这台节点的数据迁移出去，比如 Leader: 0 这台机器；

第二步：

生成迁移的计划：

 bin/kafka-reassign-partitions.sh --zookeeper cdh1:2181,cdh2:2181,cdh3:2181 --topics-to-move-json-file /opt/topic-to-move.json  --broker-list "1,2" --generate

　　

--topics-to-move-json-file ：指定哪一个topic需要做数据迁移

比如需要对test做数据迁移，那么需要在文件里面写：

{"topics": [{"topic":"test"}], "version": 1}

　　

--broker-list "1,2" ： 指的是要将数据迁移到哪些leader上

 

此时执行上面的内容，会生成执行计划日志：

[cdh@cdh1 kafka_2.11-1.0.1]$ bin/kafka-reassign-partitions.sh --zookeeper cdh1:2181,cdh2:2181,cdh3:2181 --topics-to-move-json-file /opt/topic-to-move.json  --broker-list "1,2" --generate

Current partition replica assignment
{"version":1,"partitions":[{"topic":"test","partition":1,"replicas":[0,1],"log_dirs":["any","any"]},{"topic":"test","partition":2,"replicas":[1,2],"log_dirs":["any","any"]},{"topic":"test","partition":0,"replicas":[2,0],"log_dirs":["any","any"]}]}

Proposed partition reassignment configuration
{"version":1,"partitions":[{"topic":"test","partition":1,"replicas":[2,1],"log_dirs":["any","any"]},{"topic":"test","partition":2,"replicas":[1,2],"log_dirs":["any","any"]},{"topic":"test","partition":0,"replicas":[1,2],"log_dirs":["any","any"]}]}

　　

第三步：

复制执行计划的建议执行方案放在一个文件中，比如：kafka-reassign-execute.json

[cdh@cdh1 opt]$ cat kafka-reassign-execute.json 
{"version":1,"partitions":[{"topic":"test","partition":1,"replicas":[2,1],"log_dirs":["any","any"]},{"topic":"test","partition":2,"replicas":[1,2],"log_dirs":["any","any"]},{"topic":"test","partition":0,"replicas":[1,2],"log_dirs":["any","any"]}]}
[cdh@cdh1 opt]$ 

　　

然后启动数据迁移操作：

使用--execute执行迁移计划

bin/kafka-reassign-partitions.sh --zookeeper cdh1:2181 --reassignment-json-file /opt/kafka-reassign-execute.json --execute

　　

根据数据量的不同，迁移时长也不同，可以查看执行进度：

使用-verify查看迁移进度

[cdh@cdh1 kafka_2.11-1.0.1]$  bin/kafka-reassign-partitions.sh --zookeeper cdh1:2181 --reassignment-json-file /opt/kafka-reassign-execute.json --verify
Status of partition reassignment: 
Reassignment of partition test-1 completed successfully
Reassignment of partition test-2 completed successfully
Reassignment of partition test-0 completed successfully