您现在的位置是:首页 > 文章详情

如何使用kafka增加topic的备份数量,让业务更上一层楼

日期:2019-01-08点击:287

本文由云+社区发表

一、困难点

建立topic的时候,可以通过指定参数 --replication-factor 设置备份数量。但是,一旦完成建立topic,则无法通过kafka-topic.sh 或者 命令修改replica数量。

二、解决办法

​ 实际上,我们可以考虑一种 “另类” 的办法:可以利用 kafka-reassign-partitions.sh 命令对所有分区进行重新分布,在做分区重新分布的时候,通过增加每个分区的replica备份数量来达到目的。

​ 本文将介绍如何利用 kafka-reassign-partitions.sh 命令增加topic的备份数量。

注意:以下命令使用到的topic名称、zookeeper的ip和port,需要读者替换成为实际集群的参数。

(假设kafka集群有4个broker,id分别为:1001,1002,1003,1004)

2.1、获取当前topic的所有分区分布在broker的情况

[root@tbds bin]# ./kafka-topics.sh --zookeeper 172.16.32.13:2181 --topic ranger_audits --describe Topic:ranger_audits PartitionCount:10 ReplicationFactor:1 Configs: Topic: ranger_audits Partition: 0 Leader: 1001 Replicas: 1001 Isr: 1001 Topic: ranger_audits Partition: 1 Leader: 1002 Replicas: 1002 Isr: 1002 Topic: ranger_audits Partition: 2 Leader: 1001 Replicas: 1001 Isr: 1001 Topic: ranger_audits Partition: 3 Leader: 1002 Replicas: 1002 Isr: 1002 Topic: ranger_audits Partition: 4 Leader: 1001 Replicas: 1001 Isr: 1001 Topic: ranger_audits Partition: 5 Leader: 1002 Replicas: 1002 Isr: 1002 Topic: ranger_audits Partition: 6 Leader: 1001 Replicas: 1001 Isr: 1001 Topic: ranger_audits Partition: 7 Leader: 1002 Replicas: 1002 Isr: 1002 Topic: ranger_audits Partition: 8 Leader: 1001 Replicas: 1001 Isr: 1001 Topic: ranger_audits Partition: 9 Leader: 1002 Replicas: 1002 Isr: 1002 

可以看出,ranger_audits 这个topic有10个分区,每个分区只有一个feplica备份,分布在1001和1002两台broker上面。

下面我们需要将ranger_audits 的每个分区数据都增加到2个replica备份,且分布到4个broker上面。

2.2、创建增加replica备份数量的配置文件

(注意:尽量保持topic的原有每个分区的主备份不变化。因此,配置文件的每个分区的第一个broker保持不变。)

[root@tbds bin]# vim ../config/increase-replication-factor.json {"version":1, "partitions":[ {"topic":"ranger_audits","partition":0,"replicas":[1001,1003]}, {"topic":"ranger_audits","partition":1,"replicas":[1002,1004]}, {"topic":"ranger_audits","partition":2,"replicas":[1001,1003]}, {"topic":"ranger_audits","partition":3,"replicas":[1002,1004]}, {"topic":"ranger_audits","partition":4,"replicas":[1001,1003]}, {"topic":"ranger_audits","partition":5,"replicas":[1002,1004]}, {"topic":"ranger_audits","partition":6,"replicas":[1001,1003]}, {"topic":"ranger_audits","partition":7,"replicas":[1002,1004]}, {"topic":"ranger_audits","partition":8,"replicas":[1001,1003]}, {"topic":"ranger_audits","partition":9,"replicas":[1002,1004]} ]} 

上面的配置文件说明,我们将topic的每个分区都增加了一个replica,且保持每个分区原有的主备份所在broker不变化,将每个分区新增的replica备份数据放到到1003和1004两个broker上面。

2.3、开始执行增加分区

[root@tbds bin]# ./kafka-reassign-partitions.sh -zookeeper 172.16.32.13:2181 --reassignment-json-file ../config/increase-replication-factor.json --execute Current partition replica assignment {"version":1,"partitions":[{"topic":"ranger_audits","partition":3,"replicas":[1002]},{"topic":"ranger_audits","partition":9,"replicas":[1002]},{"topic":"ranger_audits","partition":8,"replicas":[1001]},{"topic":"ranger_audits","partition":1,"replicas":[1002]},{"topic":"ranger_audits","partition":4,"replicas":[1001]},{"topic":"ranger_audits","partition":2,"replicas":[1001]},{"topic":"ranger_audits","partition":5,"replicas":[1002]},{"topic":"ranger_audits","partition":0,"replicas":[1001]},{"topic":"ranger_audits","partition":6,"replicas":[1001]},{"topic":"ranger_audits","partition":7,"replicas":[1002]}]} Save this to use as the --reassignment-json-file option during rollback Successfully started reassignment of partitions {"version":1,"partitions":[{"topic":"ranger_audits","partition":0,"replicas":[1001,1003]},{"topic":"ranger_audits","partition":8,"replicas":[1001,1003]},{"topic":"ranger_audits","partition":5,"replicas":[1002,1004]},{"topic":"ranger_audits","partition":2,"replicas":[1001,1003]},{"topic":"ranger_audits","partition":9,"replicas":[1002,1004]},{"topic":"ranger_audits","partition":1,"replicas":[1002,1004]},{"topic":"ranger_audits","partition":3,"replicas":[1002,1004]},{"topic":"ranger_audits","partition":4,"replicas":[1001,1003]},{"topic":"ranger_audits","partition":7,"replicas":[1002,1004]},{"topic":"ranger_audits","partition":6,"replicas":[1001,1003]}]} 

2.4、查看执行进度

[root@tbds bin]# ./kafka-reassign-partitions.sh -zookeeper 172.16.32.13:2181 --reassignment-json-file ../config/increase-replication-factor.json --verify Status of partition reassignment: Reassignment of partition [ranger_audits,0] completed successfully Reassignment of partition [ranger_audits,8] completed successfully Reassignment of partition [ranger_audits,5] completed successfully Reassignment of partition [ranger_audits,2] completed successfully Reassignment of partition [ranger_audits,9] completed successfully Reassignment of partition [ranger_audits,1] completed successfully Reassignment of partition [ranger_audits,3] completed successfully Reassignment of partition [ranger_audits,4] completed successfully Reassignment of partition [ranger_audits,7] completed successfully Reassignment of partition [ranger_audits,6] completed successfully 

上面显示增加分区操作成功

2.5、再次查看topic的情况

[root@tbds bin]# ./kafka-topics.sh --zookeeper 172.16.32.13:2181 --topic ranger_audits --describe Topic:ranger_audits PartitionCount:10 ReplicationFactor:2 Configs: Topic: ranger_audits Partition: 0 Leader: 1001 Replicas: 1001,1003 Isr: 1001,1003 Topic: ranger_audits Partition: 1 Leader: 1002 Replicas: 1002,1004 Isr: 1002,1004 Topic: ranger_audits Partition: 2 Leader: 1001 Replicas: 1001,1003 Isr: 1001,1003 Topic: ranger_audits Partition: 3 Leader: 1002 Replicas: 1002,1004 Isr: 1002,1004 Topic: ranger_audits Partition: 4 Leader: 1001 Replicas: 1001,1003 Isr: 1001,1003 Topic: ranger_audits Partition: 5 Leader: 1002 Replicas: 1002,1004 Isr: 1002,1004 Topic: ranger_audits Partition: 6 Leader: 1001 Replicas: 1001,1003 Isr: 1001,1003 Topic: ranger_audits Partition: 7 Leader: 1002 Replicas: 1002,1004 Isr: 1002,1004 Topic: ranger_audits Partition: 8 Leader: 1001 Replicas: 1001,1003 Isr: 1001,1003 Topic: ranger_audits Partition: 9 Leader: 1002 Replicas: 1002,1004 Isr: 1002,1004 

从上面可以看出,备份数量增加成功

三、进一步思考

​ 利用上述介绍的办法,除了可以用来增加topic的备份数量之外,还能够处理以下几个场景:

**1、对topic的所有分区数据进行整体迁移。**怎么理解呢?假如集群有N个broker,后来新扩容M个broker。由于新扩容的broker磁盘都是空的,原有的broker磁盘占用都很满。那么我们可以利用上述方法,将存储在原有N个broker的某些topic整体搬迁到新扩容的M个broker,进而实现kafka集群的整体数据均衡。

​ 具体使用方法就是:通过编写2.2章节的配置文件,将topic的所有分区都配置到新的M个broker上面去,再执行excute,即可完成topic的所有分区数据整体迁移到新扩容的M个broker节点。

***2、broker坏掉的情况。***导致某些topic的某些分区的replica数量减少,可以利用kafka-reassign-partitions.sh增加replica;

***3、kafka 某些broker磁盘占用很满,某些磁盘占用又很少。***可以利用kafka-reassign-partitions.sh迁移某些topic的分区数据到磁盘占用少的broker,实现数据均衡;

***4、kafka集群扩容。***需要把原来broker的topic数据整体迁移到新的broker,合理利用新扩容的broker,实现负载均衡。

此文已由作者授权腾讯云+社区在各渠道发布

获取更多新鲜技术干货,可以关注我们腾讯云技术社区-云加社区官方号及知乎机构号

原文链接:https://my.oschina.net/qcloudcommunity/blog/2998910
关注公众号

低调大师中文资讯倾力打造互联网数据资讯、行业资源、电子商务、移动互联网、网络营销平台。

持续更新报道IT业界、互联网、市场资讯、驱动更新,是最及时权威的产业资讯及硬件资讯报道平台。

转载内容版权归作者及来源网站所有,本站原创内容转载请注明来源。

文章评论

共有0条评论来说两句吧...

文章二维码

扫描即可查看该文章

点击排行

推荐阅读

最新文章