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system variable: add tidb_allow_fallback_to_tikv #5484

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merged 13 commits into from
Mar 23, 2021
Merged

system variable: add tidb_allow_fallback_to_tikv #5484

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e3a9da2
add system variable tidb_enable_tiflash_fallback_tikv
Feb 3, 2021
cad8527
Merge branch 'master' into tiflash-fallback-tikv
TomShawn Feb 5, 2021
5fb8cb1
rename system variable
xuyifangreeneyes Feb 24, 2021
5459ba5
Merge branch 'master' into tiflash-fallback-tikv
xuyifangreeneyes Feb 24, 2021
17ec2c1
Merge branch 'master' into tiflash-fallback-tikv
TomShawn Feb 24, 2021
e293c43
rename
xuyifangreeneyes Mar 15, 2021
ac1562a
Update system-variables.md
xuyifangreeneyes Mar 15, 2021
9ef5284
Update system-variables.md
xuyifangreeneyes Mar 22, 2021
fdf4f5a
Merge branch 'master' into tiflash-fallback-tikv
xuyifangreeneyes Mar 22, 2021
af0ee46
Update system-variables.md
xuyifangreeneyes Mar 23, 2021
17d5a4e
Update system-variables.md
xuyifangreeneyes Mar 23, 2021
16896c3
upd
xuyifangreeneyes Mar 23, 2021
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xuyifangreeneyes Mar 23, 2021
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6 changes: 6 additions & 0 deletions system-variables.md
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Expand Up @@ -1119,3 +1119,9 @@ set tidb_slow_log_threshold = 200;
- 作用域：SESSION | GLOBAL
- 默认值：ON
- 这个变量用于控制计算窗口函数时是否采用高精度模式。

### `tidb_allow_fallback_to_tikv` <span class="version-mark">从 v5.0 GA 版本开始引入</span>

- 作用域：SESSION | GLOBAL
- 默认值：""
- 这个变量表示将 TiKV 作为备用存储引擎的存储引擎列表。当该列表中的存储引擎发生故障导致 SQL 语句执行失败时，TiDB 会使用 TiKV 作为存储引擎再次执行该 SQL 语句。目前支持设置该变量为 "" 或者 "tiflash"。如果设置该变量为 "tiflash"，当 TiFlash 发生故障导致 SQL 语句执行失败时，TiDB 会使用 TiKV 作为存储引擎再次执行该 SQL 语句。