docs: Document InnoDBStalledPrimary VTOrc analysis code#2124
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Document the new InnoDBStalledPrimary analysis code that detects when a MySQL primary is stalled on an InnoDB semaphore wait. This allows VTOrc to trigger EmergencyReparentShard before mysqld self-kills, reducing outage duration. Ref: vitessio/vitess#20169
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| | `ClusterHasNoPrimary` | VTOrc detects when a shard doesn't have any primary tablet elected | VTOrc runs PlannedReparentShard to elect a new primary | | ||
| | `DeadPrimary` | VTOrc detects when the primary tablet is dead | VTOrc runs EmergencyReparentShard to elect a different primary | | ||
| | `IncapacitatedPrimary` | VTOrc detects when the primary tablet is consistently failing health checks but is still network-reachable | VTOrc runs PlannedReparentShard, falling back to EmergencyReparentShard if that fails | | ||
| | `InnoDBStalledPrimary` | VTOrc detects when the primary's MySQL is stalled on an InnoDB semaphore wait (mysqld is alive but writes are not committing). Requires MySQL 8.0+ and SELECT privilege on `performance_schema.error_log` for the `dba` user. | VTOrc runs EmergencyReparentShard to elect a different primary | |
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Added InnoDBStalledPrimary recovery action based on PR #20169 which implements the InnoDBStalledPrimary analysis code, the HasRecentInnoDBLongSemaphoreWait function in go/vt/mysqlctl/replication.go, and the recovery wiring in go/vt/vtorc/logic/topology_recovery.go.
Source: vitessio/vitess#20169
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Add documentation for the new InnoDBStalledPrimary analysis code that enables VTOrc to detect MySQL primaries stalled on InnoDB semaphore waits and trigger EmergencyReparentShard for faster recovery.
Trigger Events
InnoDBStalledPrimaryto detect stalled InnoDB semaphoresTip: Use Vale? Add your vale.ini when setting up your Docs Collection.