Cardinality Migration: New Field Rail

Cardinality Migration: New Field Rail A workflow diagram generated by Archify. 01 / Schema Change EX / Compat Gates 03 / Reader Fleet Draft Change · new field, alias, tag · Schema Change Draft Change new field, alias, tag Dual-Write · old + new field · Schema Change Dual-Write old + new field Deprecate, Remove · old readers gone · Schema Change Deprecate, Remove old readers gone Registry Check · gate the deploy · Compat Gates · must pass Registry Check gate the deploy must pass Rollback · old schema + binary · Compat Gates Rollback old schema + binary Tolerant Readers · deploy first · Reader Fleet Tolerant Readers deploy first Move Cohorts · one group at a time · Reader Fleet Move Cohorts one group at a time compatible revise both present last cohort moved errors spike fill new field Legend Agent logic Policy