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tikv: document periodic full compaction #15749

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Jan 10, 2024
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tikv: document periodic full compaction #15749

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aabf5f1
tikv: document periodic full compaction
Oreoxmt Dec 14, 2023
3c37aa0
add experimental note and refine wording
Oreoxmt Dec 18, 2023
e6ffa00
Apply suggestions from code review
Oreoxmt Dec 19, 2023
a257550
add dynamic config
Oreoxmt Dec 19, 2023
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1 change: 1 addition & 0 deletions dynamic-config.md
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Expand Up @@ -157,6 +157,7 @@ show warnings;
| raftstore.apply-max-batch-size | Raft 状态机由 BatchSystem 批量执行数据写入请求，该配置项指定每批可执行请求的最多 Raft 状态机个数。 |
| raftstore.store-max-batch-size | Raft 状态机由 BatchSystem 批量执行把日志落盘至磁盘的请求，该配置项指定每批可执行请求的最多 Raft 状态机个数。 |
| raftstore.store-io-pool-size | 处理 Raft I/O 任务的线程池中线程的数量，即 StoreWriter 线程池的大小（不支持将该配置项由非零值调整为 0，或者从 0 调整为非零值）|
| raftstore.periodic-full-compact-start-max-cpu | 控制 TiKV 执行周期性全量数据整理时的 CPU 使用率阈值 |
| readpool.unified.max-thread-count | 统一处理读请求的线程池最多的线程数量，即 UnifyReadPool 线程池大小 |
| readpool.unified.auto-adjust-pool-size | 是否开启自适应调整 UnifyReadPool 的大小 |
| coprocessor.split-region-on-table | 开启按 table 分裂 Region 的开关 |
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14 changes: 14 additions & 0 deletions tikv-configuration-file.md
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Expand Up @@ -1030,6 +1030,20 @@ raftstore 相关的配置项。
+ 默认值：0.1
+ 最小值：0

### `periodic-full-compact-start-times` <span class="version-mark">从 v7.6.0 版本开始引入</span>

> **警告：**
>
> 周期性全量数据整理目前为实验特性，不建议在生产环境中使用。该功能可能会在未事先通知的情况下发生变化或删除。如果发现 bug，请在 GitHub 上提 [issue](https://github.com/pingcap/tidb/issues) 反馈。

+ 设置 TiKV 启动周期性全量数据整理 (Compaction) 的时间。你可以在数组中指定一个或多个时间计划。例如，`periodic-full-compact-start-times = ["03:00", "23:00"]` 表示 TiKV 基于 TiKV 节点的本地时区，在每天凌晨 3 点和晚上 11 点进行全量数据整理。`periodic-full-compact-start-times = ["03:00 +0000", "23:00 +0000"]` 表示 TiKV 在每天 UTC 时间的凌晨 3 点和晚上 11 点进行全量数据整理。
+ 默认值：`[]`，表示默认情况下禁用周期性全量数据整理。

### `periodic-full-compact-start-max-cpu` <span class="version-mark">从 v7.6.0 版本开始引入</span>

+ 控制 TiKV 执行周期性全量数据整理时的 CPU 使用率阈值。
+ 默认值：`0.1`，表示全量数据整理进程的最大 CPU 使用率为 10%。

## coprocessor

Coprocessor 相关的配置项。
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