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v8.5.4: tidb: change the default value of tidb_mpp_store_fail_ttl (#21410) #22015

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Merged
merged 6 commits into from
Nov 10, 2025
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v8.5.4: tidb: change the default value of tidb_mpp_store_fail_ttl (#21410) #22015

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cdf6b8e
deprecate tidb_mpp_store_fail_ttl
gengliqi Jul 16, 2025
7b751ad
u
gengliqi Jul 16, 2025
43f8fa8
Update system-variables.md
gengliqi Jul 16, 2025
9ebbc1f
Update system-variables.md
qiancai Nov 4, 2025
ff85f74
minor wording updates
qiancai Nov 4, 2025
7fc4df1
remove v9.0 warning
qiancai Nov 6, 2025
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8 changes: 6 additions & 2 deletions system-variables.md
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Expand Up @@ -4049,12 +4049,16 @@ As shown in this diagram, when [`tidb_enable_paging`](#tidb_enable_paging-new-in

### tidb_mpp_store_fail_ttl

> **Warning:**
>
> Starting from v9.0.0, this variable is deprecated and its value is fixed to `0s`. This means TiDB no longer needs to wait before sending queries to newly started TiFlash nodes, as delays are no longer necessary to prevent query failures.

- Scope: SESSION | GLOBAL
- Persists to cluster: Yes
- Applies to hint [SET_VAR](/optimizer-hints.md#set_varvar_namevar_value): No
- Type: Duration
- Default value: `60s`
- The newly started TiFlash node does not provide services. To prevent queries from failing, TiDB limits the tidb-server sending queries to the newly started TiFlash node. This variable indicates the time range in which the newly started TiFlash node is not sent requests.
- Default value: `0s`. In v8.5.3 and earlier versions, the default value is `60s`.
- The newly started TiFlash node does not provide services. To prevent queries from failing, TiDB limits the tidb-server from sending queries to the newly started TiFlash node. This variable indicates the time range in which the newly started TiFlash node is not sent requests.

### tidb_multi_statement_mode <span class="version-mark">New in v4.0.11</span>

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