how-to: add placement rule guide#2171
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| # Placement Rules | ||
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| Placement Rules is an experimental feature introduced since PD v4.0. It is a replica rule system that guides PD to generate corresponding schedules for different types of data. By combining different scheduling rules, you can finely control the attributes such as the number of replicas of any continuous data range, the storage location, the host type, whether to participate in Raft election, and whether to act as the Raft leader. |
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storage location, host type, 后面这些跟 number of replicas 是并列关系的，都是一种 attribute。这么改行不行？
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| Placement Rules is an experimental feature introduced since PD v4.0. It is a replica rule system that guides PD to generate corresponding schedules for different types of data. By combining different scheduling rules, you can finely control the attributes such as the number of replicas of any continuous data range, the storage location, the host type, whether to participate in Raft election, and whether to act as the Raft leader. | |
| Placement Rules is an experimental feature introduced since PD v4.0. It is a replica rule system that guides PD to generate corresponding schedules for different types of data. By combining different scheduling rules, you can finely control the attributes of any continuous data range, such as the number of replicas, the storage location, the host type, whether to participate in Raft election, and whether to act as the Raft leader. |
| | `GroupID` | `string` | The group ID that marks the source of the rule. | | ||
| | `ID` | `string` | The unique ID of a rule in a group. | | ||
| | `Index` | `int` | The stacking sequence of rules in a group. | | ||
| | `Override` | `true`/`false` | The smaller rule that determines whether to overwrite index (in a group). | |
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Whether to overwrite rule with smaller index (in a group)
| enable-placement-rules = true | ||
| ``` | ||
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| In this way, PD enables this feature after the cluster is successfully initialized and generates corresponding rules according to the `max-replicas` and `location-labels` configurations: |
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initialized -> bootstrapped
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| ``` | ||
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| For a initialized cluster, you can also enable Placement Rules online through pd-ctl: |
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| ### Place five replicas in three data centers in the proportion of two-two-one, and the Leader should not be in the third data center |
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two-two-one -> 2-2-1 or 2:2:1?
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* how-to: add placement rule guide * fix typos * address comments from disksing * how-to: update wording and format * how-to: update and fix description Co-authored-by: Lilian Lee <lilin@pingcap.com>
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cherry pick to release-4.0 in PR #2185 |
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* how-to: add placement rule guide * fix typos * address comments from disksing * how-to: update wording and format * how-to: update and fix description Co-authored-by: Lilian Lee <lilin@pingcap.com> Co-authored-by: TomShawn <41534398+TomShawn@users.noreply.github.com> Co-authored-by: Lilian Lee <lilin@pingcap.com>
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Signed-off-by: sre-bot <sre-bot@pingcap.com>
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cherry pick to release-3.1 in PR #2810 |
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What is changed, added or deleted? (Required)
Add placement rules configuratoin guide.
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