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pd: update default value of max-merge-region-size #18291

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pd: update default value of max-merge-region-size #18291

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d2de61f
update
HuSharp Aug 6, 2024
4f0bbc7
address comment
HuSharp Aug 6, 2024
363bd98
Update release-8.2.0.md
qiancai Aug 13, 2024
722c292
Update releases/release-8.2.0.md
qiancai Aug 13, 2024
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4 changes: 2 additions & 2 deletions best-practices/pd-scheduling-best-practices.md
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Expand Up @@ -105,8 +105,8 @@ Region merge 指的是为了避免删除数据后大量小甚至空的 Region

具体来说，当某个新分裂出来的 Region 存在的时间超过配置项 [`split-merge-interval`](/pd-configuration-file.md#split-merge-interval) 的值（默认 1h）后，如果同时满足以下情况，该 Region 会触发 Region merge 调度：

- 该 Region 大小小于配置项 [`max-merge-region-size`](/pd-configuration-file.md#max-merge-region-size) 的值（默认 20 MiB）
- 该 Region 中 key 的数量小于配置项 [`max-merge-region-keys`](/pd-configuration-file.md#max-merge-region-keys) 的值（默认 200000）
- 该 Region 大小小于配置项 [`max-merge-region-size`](/pd-configuration-file.md#max-merge-region-size) 的值（默认 54 MiB）
- 该 Region 中 key 的数量小于配置项 [`max-merge-region-keys`](/pd-configuration-file.md#max-merge-region-keys) 的值（默认 540000）

## 查询调度状态

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4 changes: 2 additions & 2 deletions pd-configuration-file.md
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Expand Up @@ -256,13 +256,13 @@ pd-server 相关配置项。
### `max-merge-region-size`

+ 控制 Region Merge 的 size 上限，当 Region Size 大于指定值时 PD 不会将其与相邻的 Region 合并。
+ 默认：20
+ 默认：54 （8.2.0 及之前版本默认值为 20）
+ 单位：MiB

### `max-merge-region-keys`
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+ 控制 Region Merge 的 key 上限，当 Region key 大于指定值时 PD 不会将其与相邻的 Region 合并。
+ 默认：200000
+ 默认：540000（8.2.0 及之前版本默认值为 200000）

### `patrol-region-interval`

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4 changes: 2 additions & 2 deletions pd-control.md
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Expand Up @@ -164,8 +164,8 @@ config show
"leader-schedule-limit": 4,
"leader-schedule-policy": "count",
"low-space-ratio": 0.8,
"max-merge-region-keys": 200000,
"max-merge-region-size": 20,
"max-merge-region-keys": 540000,
"max-merge-region-size": 54,
"max-pending-peer-count": 64,
"max-snapshot-count": 64,
"max-store-down-time": "30m0s",
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2 changes: 2 additions & 0 deletions releases/release-8.2.0.md
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Expand Up @@ -183,6 +183,8 @@ TiDB 版本：8.2.0
| TiKV | [`max-apply-unpersisted-log-limit`](/tikv-configuration-file.md#max-apply-unpersisted-log-limit-从-v810-版本开始引入) | 修改 | 默认值从 `0` 修改为 `1024`，代表允许 apply 已经 `commit` 但尚未持久化的 Raft 日志的最大数量为 1024，用于降低 TiKV 节点上因 I/O 抖动导致的长尾延迟。 |
| TiKV | [`server.grpc-compression-type`](/tikv-configuration-file.md#grpc-compression-type) | 修改 | 该配置项现在也会影响 TiKV 向 TiDB 发送的响应消息的压缩算法。开启压缩可能消耗更多 CPU 资源。 |
| TiFlash | [`security.redact_info_log`](/tiflash/tiflash-configuration.md#配置文件-tiflashtoml) | 修改 | 可选值新增 `marker` 选项。当配置项的值设置为 `marker` 时，日志中的用户数据会被标记符号 `‹ ›` 包裹。 |
| PD | [`schedule.max-merge-region-size`](/pd-configuration-file.md#max-merge-region-size) | 修改 | 默认值从 `20` MiB 修改为 `54` MiB。 |
| PD | [`schedule.max-merge-region-keys`](/pd-configuration-file.md#max-merge-region-keys) | 修改 | 默认值从 `200000` 修改为 `540000`。 |

### 编译器版本

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