linux 怎样查看kafka的某 topic数据
1、创建一个需要增加备份因子的topic列表的文件,文件格式是json格式的。
2、使用kafka官方提供的工具拿到上面topic的partions 分布情况,并重定向到文件中。
3、修改ressgintopic.conf 文件的,手动分配新增加的partion 备份因子。
4、通过下面命令执行备份因子扩容过程,bin/kafka-reassign-partitions.sh --zookeeper localhost:2181 --reassignment-json。
5、最后查看kafka的某 topic数据如图。
注意事项:
Kafka的目的是通过Hadoop的并行加载机制来统一线上和离线的消息处理,也是为了通过集群来提供实时的消息。
##查看topic分布情况kafka-list-topic.sh
bin/kafka-list-topic.sh --zookeeper 192.168.197.170:2181,192.168.197.171:2181 (列出所有topic的分区情况)
bin/kafka-list-topic.sh --zookeeper 192.168.197.170:2181,192.168.197.171:2181 --topic test (查看test的分区情况)
其实kafka-list-topic.sh里面就一句
exec $(dirname $0)/kafka-run-class.sh kafka.admin.ListTopicCommand $@
实际是通过
kafka-run-class.sh脚本执行的包kafka.admin下面的类
##创建TOPIC kafka-create-topic.sh
bin/kafka-create-topic.sh --replica 2 --partition 8 --topic test --zookeeper 192.168.197.170:2181,192.168.197.171:2181
创建名为test的topic, 8个分区分别存放数据,数据备份总共2份
bin/kafka-create-topic.sh --replica 1 --partition 1 --topic test2 --zookeeper 192.168.197.170:2181,192.168.197.171:2181
结果 topic: test2 partition: 0 leader: 170 replicas: 170 isr: 170
##重新分配分区kafka-reassign-partitions.sh
这个命令可以分区指定到想要的--broker-list上
bin/kafka-reassign-partitions.sh --topics-to-move-json-file topics-to-move.json --broker-list "171" --zookeeper 192.168.197.170:2181,192.168.197.171:2181 --execute
cat topic-to-move.json
{"topics":
[{"topic": "test2"}],
"version":1
}
##为Topic增加 partition数目kafka-add-partitions.sh
bin/kafka-add-partitions.sh --topic test --partition 2 --zookeeper 192.168.197.170:2181,192.168.197.171:2181 (为topic test增加2个分区)
##控制台接收消息
bin/kafka-console-consumer.sh --zookeeper 192.168.197.170:2181,192.168.197.171:2181 --from-beginning --topic test
##控制台发送消息
bin/kafka-console-producer.sh --broker-list 192.168.197.170:9092,192.168.197.171: 9092 --topic test
##手动均衡topic, kafka-preferred-replica-election.sh
bin/kafka-preferred-replica-election.sh --zookeeper 192.168.197.170:2181,192.168.197.171:2181 --path-to-json-file preferred-click.json
cat preferred-click.json
{
"partitions":
[
{"topic": "click", "partition": 0},
{"topic": "click", "partition": 1},
{"topic": "click", "partition": 2},
{"topic": "click", "partition": 3},
{"topic": "click", "partition": 4},
{"topic": "click", "partition": 5},
{"topic": "click", "partition": 6},
{"topic": "click", "partition": 7},
{"topic": "play", "partition": 0},
{"topic": "play", "partition": 1},
{"topic": "play", "partition": 2},
{"topic": "play", "partition": 3},
{"topic": "play", "partition": 4},
{"topic": "play", "partition": 5},
{"topic": "play", "partition": 6},
{"topic": "play", "partition": 7}
]
}
##删除topic,慎用,只会删除zookeeper中的元数据,消息文件须手动删除
bin/kafka-run-class.sh kafka.admin.DeleteTopicCommand --topic test666 --zookeeper 192.168.197.170:2181 ,192.168.197.171:2181
查看topic分布情况kafka-list-topic.sh:
bin/kafka-list-topic.sh-zookeeper 192.168.197.170:2181,192.168.197.171:2181 (列出所有topic的分区情况)
bin/kafka-list-topic.sh-zookeeper 192.168.197.170:2181,192.168.197.171:2181-topic test (查看test的分区情况)
创建topickafka-create-topic.sh:
bin/kafka-create-topic.sh-replica 2-partition 8-topic test-zookeeper 192.168.197.170:2181,192.168.197.171:2181
创建名为test的topic,8个分区分别存放数据,数据备份总共2份。
参考资料
kafka 创建topic,查看topic - CSDN博客.blog.csdn.[引用时间2017-12-29]