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update tikv configuration about pessimistic transaction #3178

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Merged
merged 4 commits into from
May 22, 2020
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update tikv configuration about pessimistic transaction #3178

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a4750c3
update tikv configuration about pessimistic transaction
youjiali1995 May 20, 2020
4b8705c
Update tikv-configuration-file.md
youjiali1995 May 21, 2020
8c69494
Update tikv-configuration-file.md
youjiali1995 May 21, 2020
de73022
Merge branch 'docs-special-week' into fix-tikv-config-about-pessimist…
toutdesuite May 22, 2020
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15 changes: 10 additions & 5 deletions tikv-configuration-file.md
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Expand Up @@ -1159,11 +1159,16 @@ import 相关的配置项。

### `wait-for-lock-timeout`

+ 悲观事务在 TiKV 中等待其他事务释放锁的最长时间，单位为毫秒。若超时则会返回错误给 TiDB 并由 TiDB 重试加锁，语句最长等锁时间由 `innodb_lock_wait_timeout` 控制。
+ 默认值：1000
+ 最小值：1
+ 悲观事务在 TiKV 中等待其他事务释放锁的最长时间。若超时则会返回错误给 TiDB 并由 TiDB 重试加锁，语句最长等锁时间由 `innodb_lock_wait_timeout` 控制。
+ 默认值：1s
+ 最小值：1ms

### `wait-up-delay-duration`

+ 悲观事务释放锁时，只会唤醒等锁事务中 start ts 最小的事务，其他事务将会延迟 `wake-up-delay-duration` 毫秒之后被唤醒。
+ 默认值：20
+ 悲观事务释放锁时，只会唤醒等锁事务中 `start_ts` 最小的事务，其他事务将会延迟 `wake-up-delay-duration` 之后被唤醒。
+ 默认值：20ms

### `pipelined`

+ 开启流水线式加悲观锁流程。开启该功能后，TiKV 在检测数据满足加锁要求后，立刻通知 TiDB 执行后面的请求，并异步写入悲观锁，从而降低大部分延迟，显著提升悲观事务的性能。但有较低概率出现悲观锁异步写入失败的情况，可能会导致悲观事务提交失败。
+ 默认值：false