Database operational contract

MySQL 8.4 CHANGE MASTER TO removed replica bootstrap script fails before replication starts

Replica bootstrap script fails before replication starts.

MySQL 8.4Relational databaseDatabase operational contractmysql84

Agent Quick Fix

Repair against the current MySQL 8.4 contract, then keep the change narrow and source-backed.

Product: MySQL 8.4
Current-contract area: CHANGE MASTER TO removed
Likely root cause: Replica bootstrap script fails before replication starts.
Repair direction: Verifier checks durability, restart, and operational safety rather than a one-shot query. Check operational state and security, not a compatibility switch that weakens the server.

Symptom

Replica bootstrap script fails before replication starts.

Why This Happens

The local schema/query is valid, but upgrade path, restart behavior, replication syntax, or background operations changed in the server release.

Common Wrong Fixes

Changing local code without checking the current external contract.
Retrying the same install, build, or API call with no version/source change.
Applying a broad unsafe bypass when a narrow compatibility fix is available.

Codex Search Keywords

These are the search terms observed in a neutral Codex validation run for this failure shape.

MySQL 8.4 CHANGE MASTER TO removed replica bootstrap script fails before replication starts
MySQL 8.4 CHANGE MASTER TO syntax removed replacement CHANGE REPLICATION SOURCE TO
site:dev.mysql.com/doc/refman/8.4 CHANGE MASTER TO MySQL 8.4
https://dev.mysql.com/doc/refman/8.4/en/change-replication-source-to.html
'The following deprecated terms are no longer used' in https://dev.mysql.com/doc/refman/8.4/en/change-replication-source-to.html
https://dev.mysql.com/doc/refman/8.4/en/replica-logs-status.html