课程名称：2.5.3 Usage of PD control（PD Control 的典型使用场景）
学习时长：45min
课程收获：使用 pd-ctl 工具，查看集群信息，调度策略，调度参数配置
课程内容：
-
Placement Driver的概览
-
PD Control 使用场景
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在PD不能按照预期做调度时，通过PD Control制定调度策略
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启动方式
- tiup ctl pd -u http://<pd_ip>:<pd_port> [-i]
- tidb-ansible /resources/bin/pd-ctl -u http://<pd_ip>:<pd_port> [-i]
-
有用的参数
- –detach, -d：单命令模式（默认）
- –interfact, -i：交互模式
- –pd, -u：生命PD地址（默认 http://127.0.0.1:2379）
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从进程获取pd信息
- bin/tidb-server … --path=xxxx:2379,yyyy:2379,zzzz:2379
- bin/tikv-server … --pd xxxx:2379,yyyy:2379,zzzz:2379
- tiup cluster display <cluster_name>
-
-
查看及修改pd config
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启动pd ctl后子命令
- cluster
- member
- member leader show
- health
- tso xxxxxxxxxxxxxxx
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修改pd member
- member leader resign
- member leader transfer <pd_name>
- member leader_priority <pd_name>
- member delete name <pd_name>
- member delete id <pd_id>
-
kv cluster info
-
store
-
region
-
region <region_id>
-
region store <store_id>
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List store label (DC/Zone/Rack/Host) info
- label
- label store dc <dc_name>
-
-
modify kv member
- store weight <store_id> <leader_weight> <region_weight>
- store label 1
- store delete <store_id>
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Scheduler Config
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调度速度
- .leader-schedule-limit
- …
- tolerant-size-ratio
-
Region Merge Limit
- max-merge-region-keys
- max-merge-region-size
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Rebalance Timer
- max-store-down-time
-
-
修改Scheduler Config
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config set
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与Region Merge有关的修改
- config set region-schedule-limit
- …
-
-
查看及控制Scheduling Operation
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显示operators
- opertator show
- operator show admin/leader/Region
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对一个store上某个Region增加或删除副本
- operator add add-peer <region_id> <store_id>
- operator add remove-peer <region_id> <store_id>
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将某个Region的leader调度到某个store
- operator add transfer-leader <region_id> <store_id>
-
…
-
-
Store Limit Config
- store limit
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Set Store Limit
-
