failed to successfully refresh all tablets in the %s/%s targ

Error message

failed to successfully refresh all tablets in the %s/%s target shard (%v):
  %v

What it means

Same refresh guard as the source side, but applied to the target shard: if any target tablet fails to refresh after the traffic switch, this error reports the keyspace, shard, error and partial details. When ts.force is set, the failure is downgraded to a warning log and the switch succeeds; otherwise it aborts.

Source

Thrown at go/vt/vtctl/workflow/traffic_switcher.go:528

			return si.UpdateDeniedTables(ctx, topo.UpdateDeniedTablesOpts{
				Remove:     true,
				Tables:     ts.Tables(),
				TabletType: topodatapb.TabletType_PRIMARY,
			})
		}); err != nil {
			return err
		}
		rtbsCtx, cancel := context.WithTimeout(ctx, shardTabletRefreshTimeout)
		defer cancel()
		isPartial, partialDetails, err := topotools.RefreshTabletsByShard(rtbsCtx, ts.TopoServer(), ts.TabletManagerClient(), target.GetShard(), nil, ts.Logger())
		if isPartial {
			msg := fmt.Sprintf("failed to successfully refresh all tablets in the %s/%s target shard (%v):\n  %v",
				target.GetShard().Keyspace(), target.GetShard().ShardName(), err, partialDetails)
			if ts.force {
				log.Warn(msg)
				return nil
			} else {
				return errors.New(msg)
			}
		}
		return err
	})
}

func (ts *trafficSwitcher) validateWorkflowHasCompleted(ctx context.Context) error {
	return doValidateWorkflowHasCompleted(ctx, ts)
}

func (ts *trafficSwitcher) dropParticipatingTablesFromKeyspace(ctx context.Context, keyspace string) error {
	vschema, err := ts.TopoServer().GetVSchema(ctx, keyspace)
	if err != nil {
		return err
	}
	// VReplication does NOT create the vschema entries in SHARDED
	// TARGET keyspaces -- as we cannot know the proper vindex
	// definitions to use -- and we should not delete them either

View on GitHub (pinned to 01a25a7d17)

Solutions

Restore the failing target tablets (restart, fix networking) and re-run the traffic switch.
Retry the switch once the shard is healthy; only use force if partial refresh is tolerable.
Inspect vttablet logs on the named target tablets for the root-cause refresh error.

Example fix

// before
return errors.New(msg) // target refresh failure aborts switch
// after
vtctldclient SwitchWrites --force commerce.sales // proceeds, logs warning instead

Defensive patterns

Strategy: retry

Validate before calling

for _, t := range targetShardTablets {
    if !tabletHealthy(ctx, t) { return fmt.Errorf("tablet %s unhealthy before switch", t) }
}

Try / catch

err := switchTraffic(ctx, ks, wf)
if isTabletRefreshErr(err) && isRetryable(err) {
    err = retry.Do(ctx, 3, func() error { return switchTraffic(ctx, ks, wf) })
}

Prevention

Confirm target shard health before switching writes
Avoid cutover during vttablet restarts or throttling windows
Retry the switch after fixing failed tablets rather than forcing immediately

When it happens

Trigger: SwitchReads/SwitchWrites where one or more tablets in the target shard (target.GetShard()) fail the refresh step, with partialDetails naming the failed tablets.

Common situations: Target tablet down or unreachable during cutover, throttling, or a vttablet restart colliding with the traffic switch window.

Related errors

AI-assisted analysis of vitessio/vitess@01a25a7d17 (2026-09-01). Data as JSON: /api/errors/b42c9e6a0b033ba5. Report an issue: GitHub.