Online DDL: introducing ddl_strategy -singleton-context
flag
#7946
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Description
Followup to #7785
This PR introduces
ddl_strategy
now supports-singleton-context
flag.-singleton
rejects a migration if there's any other pending migration-singleton-context
rejects a migration is there's any other pending migration that has a different migration context.With
-singleton-context
, it is possible to submit multiple migrations which all share the same migration context. For example, the following is allowed:The above submits three migrations. All three will be accepted. For comparison, running the above with
-singleton
would accept the first migration (drop table if exists t1
) and reject the other two.Related Issue(s)
Checklist
Deployment Notes
Impacted Areas in Vitess
Components that this PR will affect: