#  pd-ctl Basic Operations

+ View and modify scheduling parameters
  + `config show`: Display current schedule-related parameters
  + `config set <key> <value>`: Modify relevant parameters
  + `store limit <store_id> <value>`: Limit store  the scheduling speed of a single
+ Add manually `Operator` 
  + `operator show [admin|leader|region]`: Display the current global or a certain type of scheduled task
  + `operator add`: Manually add some scheduled tasks to implement the desired goal, such as:
    + `operator add add-peer <region_id> <store_id>` 
    + `operator add remove-peer <region_id> <store_id>` 
    + `operator add transfer-leader <region_id> <store_id>` 

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pd-ctl basic operation
- View and modify scheduling parameters
  - config show shows current schedule-related parameters
  - config set <key><value>to modify relevant parameters
  - Store <store_id><value>limit the scheduling speed of a single store
- Add Operators manually
  - The operator show [admin|leader|region] shows the current global or some kind of scheduled tasks
  - operator add manually add some scheduled tasks to implement the desired goal, for example
    - operator add add-peer <region_id><store_id>
    - operator add remove-peer <region_id><store_id>
    - operator add transfer-leader <region_id><store_id>
- How to set a label
  - Label contains two parts of PD and TiKV settings. PD can be modified online by modifying replication.location-labels configuration, TiKV <store_id><key><value>can be modify online through store label, but the TiKV configuration needs to be modify at the same time The corresponding server.labels parameter in the file.
  - Note
    - TiKV configuration needs to be consistent with the PD configuration level. If the strictly-match-label parameter is enabled, an error will be reported when the two parts of the configuration are found to be inconsistent.
    - Enable-placement-rules is required to be enabled when deploying TiFlash. In this case, location-labels cannot be set through config set, max-replicas parameter, and need to be modify through placement rules