# **练习-3 : 缩容 `TiCDC` 节点** ## 概述 + 在本练习中，将对当前的 TiCDC 节点进行缩容｡ ## 练习环境要求 + 1. 注意，您的实验环境（包括IP，端口号，用户名，密码和目录）可能和手册不同。 + 2. 可以连接到实验用虚拟机。 + 3. TiDB 数据库提前部署完毕。 + 4. 需要完成练习-2。 ## 拓扑图 ## 步骤 ----------------------------------------------- #### 1. 停止并删除 TiCDC 数据同步任务。 + **使用 cdc cli 工具停止同步任务，如下:** ``` # ./cdc cli changefeed pause --pd=http://172.31.0.232:2379 --changefeed-id replication-task-1 ``` + **使用 cdc cli 工具删除同步任务，如下：** ``` # ./cdc cli changefeed remove --pd=http://172.31.0.232:2379 --changefeed-id replication-task-1 ``` + **使用 cdc cli 工具查询同步任务，如下：** ``` # ./cdc cli changefeed list --pd=http://172.31.0.232:2379 ``` ``` [] ``` ----------------------------------------------- #### 2. 缩容 TiCDC 集群。 + **使用 tiup cluster scale-in 命令对 TiCDC 集群进行缩容（需要输入一次 y），如下:** ``` # tiup cluster scale-in tidb-test --node 172.31.0.135:8300 ``` + **查看缩容 TiCDC 后的集群状态，如下:** ``` # tiup cluster display tidb-test ``` ----------------------------------------------- ## 输出样例 ----------------------------------------------- #### 步骤 2-使用 tiup cluster scale-in 命令对 TiCDC 集群进行缩容输出参考**： ``` # tiup cluster scale-in tidb-test --node 172.31.0.135:8300 ``` ``` tiup is checking updates for component cluster ... Starting component `cluster`: /root/.tiup/components/cluster/v1.10.2/tiup-cluster scale-in tidb-test --node 172.31.0.135:8300 ... This operation will delete the 172.31.0.135:8300 nodes in `tidb-test` and all their data. Do you want to continue? [y/N]:(default=N) y ... + Refresh instance configs - Generate config pd -> 172.31.0.233:2379 ... Done - Generate config pd -> 172.31.0.175:2379 ... Done - Generate config pd -> 172.31.0.232:2379 ... Done - Generate config tikv -> 172.31.0.234:20160 ... Done - Generate config tikv -> 172.31.0.79:20160 ... Done - Generate config tikv -> 172.31.0.95:20160 ... Done - Generate config tidb -> 172.31.0.135:4000 ... Done - Generate config tiflash -> 172.31.0.225:9000 ... Done - Generate config prometheus -> 172.31.0.233:9090 ... Done - Generate config grafana -> 172.31.0.233:3000 ... Done - Generate config alertmanager -> 172.31.0.233:9093 ... Done + Reload prometheus and grafana - Reload prometheus -> 172.31.0.233:9090 ... Done - Reload grafana -> 172.31.0.233:3000 ... Done Scaled cluster `tidb-test` in successfully ``` ----------------------------------------------- #### 步骤 2-查看缩容 TiCDC 后的集群状态输出参考： ``` # tiup cluster display tidb-test ``` ``` tiup is checking updates for component cluster ... Starting component `cluster`: /root/.tiup/components/cluster/v1.10.2/tiup-cluster display tidb-test Cluster type: tidb Cluster name: tidb-test Cluster version: v6.1.0 Deploy user: tidb SSH type: builtin Dashboard URL: http://172.31.0.232:2379/dashboard Grafana URL: http://172.31.0.233:3000 ID Role Host Ports OS/Arch Status Data Dir Deploy Dir -- ---- ---- ----- ------- ------ -------- ---------- 172.31.0.233:9093 alertmanager 172.31.0.233 9093/9094 linux/x86_64 Up /tidb-data/alertmanager-9093 /tidb-deploy/alertmanager-9093 172.31.0.233:3000 grafana 172.31.0.233 3000 linux/x86_64 Up - /tidb-deploy/grafana-3000 172.31.0.175:2379 pd 172.31.0.175 2379/2380 linux/x86_64 Up /tidb-data/pd-2379 /tidb-deploy/pd-2379 172.31.0.232:2379 pd 172.31.0.232 2379/2380 linux/x86_64 Up|UI /tidb-data/pd-2379 /tidb-deploy/pd-2379 172.31.0.233:2379 pd 172.31.0.233 2379/2380 linux/x86_64 Up|L /tidb-data/pd-2379 /tidb-deploy/pd-2379 172.31.0.233:9090 prometheus 172.31.0.233 9090/12020 linux/x86_64 Up /tidb-data/prometheus-9090 /tidb-deploy/prometheus-9090 172.31.0.135:4000 tidb 172.31.0.135 4000/10080 linux/x86_64 Up - /tidb-deploy/tidb-4000 172.31.0.225:9000 tiflash 172.31.0.225 9000/8123/3930/20170/20292/8234 linux/x86_64 Up /tidb-data/tiflash-9000 /tidb-deploy/tiflash-9000 172.31.0.234:20160 tikv 172.31.0.234 20160/20180 linux/x86_64 Up /tidb-data/tikv-20160 /tidb-deploy/tikv-20160 172.31.0.79:20160 tikv 172.31.0.79 20160/20180 linux/x86_64 Up /tidb-data/tikv-20160 /tidb-deploy/tikv-20160 172.31.0.95:20160 tikv 172.31.0.95 20160/20180 linux/x86_64 Up /tidb-data/tikv-20160 /tidb-deploy/tikv-20160 Total nodes: 11 ``` -----------------------------------------------