// ChangeSlaveType changes the type of tablet and recomputes all
// necessary derived paths in the serving graph, if necessary.
//
// Note we don't update the master record in the Shard here, as we
// can't ChangeType from and out of master anyway.
func (wr *Wrangler) ChangeSlaveType(ctx context.Context, tabletAlias *topodatapb.TabletAlias, tabletType topodatapb.TabletType) error {
// Load tablet to find endpoint, and keyspace and shard assignment.
ti, err := wr.ts.GetTablet(ctx, tabletAlias)
if err != nil {
return err
}
if !topo.IsTrivialTypeChange(ti.Type, tabletType) {
return fmt.Errorf("tablet %v type change %v -> %v is not an allowed transition for ChangeSlaveType", tabletAlias, ti.Type, tabletType)
}
// ask the tablet to make the change
if err := wr.tmc.ChangeType(ctx, ti, tabletType); err != nil {
return err
}
// if the tablet was or is serving, rebuild the serving graph
if ti.IsInServingGraph() || topo.IsInServingGraph(tabletType) {
if _, err := wr.RebuildShardGraph(ctx, ti.Tablet.Keyspace, ti.Tablet.Shard, []string{ti.Tablet.Alias.Cell}); err != nil {
return err
}
}
return nil
}
// ChangeType changes the type of the tablet and possibly also updates
// the health informaton for it. Make this external, since these
// transitions need to be forced from time to time.
//
// - if health is nil, we don't touch the Tablet's Health record.
// - if health is an empty map, we clear the Tablet's Health record.
// - if health has values, we overwrite the Tablet's Health record.
func ChangeType(ctx context.Context, ts topo.Server, tabletAlias topo.TabletAlias, newType topo.TabletType, health map[string]string) error {
tablet, err := ts.GetTablet(ctx, tabletAlias)
if err != nil {
return err
}
if !topo.IsTrivialTypeChange(tablet.Type, newType) {
return fmt.Errorf("cannot change tablet type %v -> %v %v", tablet.Type, newType, tabletAlias)
}
tablet.Type = newType
if newType == topo.TYPE_IDLE {
tablet.Keyspace = ""
tablet.Shard = ""
tablet.KeyRange = key.KeyRange{}
tablet.Health = health
}
if health != nil {
if len(health) == 0 {
tablet.Health = nil
} else {
tablet.Health = health
}
}
return topo.UpdateTablet(ctx, ts, tablet)
}
// Make this external, since these transitions need to be forced from time to time.
func ChangeType(ts topo.Server, tabletAlias topo.TabletAlias, newType topo.TabletType, runHooks bool) error {
tablet, err := ts.GetTablet(tabletAlias)
if err != nil {
return err
}
if !topo.IsTrivialTypeChange(tablet.Type, newType) || !topo.IsValidTypeChange(tablet.Type, newType) {
return fmt.Errorf("cannot change tablet type %v -> %v %v", tablet.Type, newType, tabletAlias)
}
if runHooks {
// Only run the preflight_serving_type hook when
// transitioning from non-serving to serving.
if !topo.IsInServingGraph(tablet.Type) && topo.IsInServingGraph(newType) {
if err := hook.NewSimpleHook("preflight_serving_type").ExecuteOptional(); err != nil {
return err
}
}
}
tablet.Type = newType
if newType == topo.TYPE_IDLE {
if tablet.Parent.IsZero() {
si, err := ts.GetShard(tablet.Keyspace, tablet.Shard)
if err != nil {
return err
}
rec := concurrency.AllErrorRecorder{}
wg := sync.WaitGroup{}
for _, cell := range si.Cells {
wg.Add(1)
go func(cell string) {
defer wg.Done()
sri, err := ts.GetShardReplication(cell, tablet.Keyspace, tablet.Shard)
if err != nil {
log.Warningf("Cannot check cell %v for extra replication paths, assuming it's good", cell)
return
}
for _, rl := range sri.ReplicationLinks {
if rl.Parent == tabletAlias {
rec.RecordError(fmt.Errorf("Still have a ReplicationLink in cell %v", cell))
}
}
}(cell)
}
wg.Wait()
if rec.HasErrors() {
return rec.Error()
}
}
tablet.Parent = topo.TabletAlias{}
tablet.Keyspace = ""
tablet.Shard = ""
tablet.KeyRange = key.KeyRange{}
}
return topo.UpdateTablet(ts, tablet)
}
// ChangeSlaveType changes the type of tablet and recomputes all
// necessary derived paths in the serving graph, if necessary.
//
// Note we don't update the master record in the Shard here, as we
// can't ChangeType from and out of master anyway.
func (wr *Wrangler) ChangeSlaveType(ctx context.Context, tabletAlias *topodatapb.TabletAlias, tabletType topodatapb.TabletType) error {
// Load tablet to find endpoint, and keyspace and shard assignment.
ti, err := wr.ts.GetTablet(ctx, tabletAlias)
if err != nil {
return err
}
if !topo.IsTrivialTypeChange(ti.Type, tabletType) {
return fmt.Errorf("tablet %v type change %v -> %v is not an allowed transition for ChangeSlaveType", tabletAlias, ti.Type, tabletType)
}
// and ask the tablet to make the change
return wr.tmc.ChangeType(ctx, ti.Tablet, tabletType)
}
// changeType is a single iteration of the update loop for ChangeType().
func changeType(tablet *topodatapb.Tablet, newType topodatapb.TabletType, health map[string]string) error {
if !topo.IsTrivialTypeChange(tablet.Type, newType) {
return fmt.Errorf("cannot change tablet type %v -> %v for %v", tablet.Type, newType, tablet.Alias)
}
tablet.Type = newType
if health != nil {
if len(health) == 0 {
tablet.HealthMap = nil
} else {
tablet.HealthMap = health
}
}
return nil
}
// ChangeType changes the type of the tablet and possibly also updates
// the health information for it. Make this external, since these
// transitions need to be forced from time to time.
//
// - if health is nil, we don't touch the Tablet's Health record.
// - if health is an empty map, we clear the Tablet's Health record.
// - if health has values, we overwrite the Tablet's Health record.
func ChangeType(ctx context.Context, ts topo.Server, tabletAlias *topodatapb.TabletAlias, newType topodatapb.TabletType, health map[string]string) error {
return ts.UpdateTabletFields(ctx, tabletAlias, func(tablet *topodatapb.Tablet) error {
if !topo.IsTrivialTypeChange(tablet.Type, newType) {
return fmt.Errorf("cannot change tablet type %v -> %v %v", tablet.Type, newType, tabletAlias)
}
tablet.Type = newType
if health != nil {
if len(health) == 0 {
tablet.HealthMap = nil
} else {
tablet.HealthMap = health
}
}
return nil
})
}
// RecordChangeSlaveTypeAction records a new ChangeSlaveTypeAction
// into the specified Cleaner
func RecordChangeSlaveTypeAction(cleaner *Cleaner, tabletAlias *topodatapb.TabletAlias, from topodatapb.TabletType, to topodatapb.TabletType) {
cleaner.Record(ChangeSlaveTypeActionName, topoproto.TabletAliasString(tabletAlias), func(ctx context.Context, wr *Wrangler) error {
ti, err := wr.ts.GetTablet(ctx, tabletAlias)
if err != nil {
return err
}
if ti.Type != from {
return fmt.Errorf("tablet %v is not of the right type (got %v expected %v), not changing it to %v", topoproto.TabletAliasString(tabletAlias), ti.Type, from, to)
}
if !topo.IsTrivialTypeChange(ti.Type, to) {
return fmt.Errorf("tablet %v type change %v -> %v is not an allowed transition for ChangeSlaveType", topoproto.TabletAliasString(tabletAlias), ti.Type, to)
}
// ask the tablet to make the change
return wr.tmc.ChangeType(ctx, ti.Tablet, to)
})
}
// Make this external, since these transitions need to be forced from time to time.
func ChangeType(ts topo.Server, tabletAlias topo.TabletAlias, newType topo.TabletType, runHooks bool) error {
tablet, err := ts.GetTablet(tabletAlias)
if err != nil {
return err
}
if !topo.IsTrivialTypeChange(tablet.Type, newType) || !topo.IsValidTypeChange(tablet.Type, newType) {
return fmt.Errorf("cannot change tablet type %v -> %v %v", tablet.Type, newType, tabletAlias)
}
if runHooks {
// Only run the preflight_serving_type hook when
// transitioning from non-serving to serving.
if !topo.IsServingType(tablet.Type) && topo.IsServingType(newType) {
if err := hook.NewSimpleHook("preflight_serving_type").ExecuteOptional(); err != nil {
return err
}
}
}
tablet.Type = newType
if newType == topo.TYPE_IDLE {
if tablet.Parent.Uid == topo.NO_TABLET {
// With a master the node cannot be set to idle unless we have already removed all of
// the derived paths. The global replication path is a good indication that this has
// been resolved.
children, err := ts.GetReplicationPaths(tablet.Keyspace, tablet.Shard, tablet.ReplicationPath())
if err != nil && err != topo.ErrNoNode {
return err
}
if err == nil && len(children) > 0 {
return fmt.Errorf("cannot change tablet type %v -> %v - reparent action has not finished %v", tablet.Type, newType, tabletAlias)
}
}
tablet.Parent = topo.TabletAlias{}
tablet.Keyspace = ""
tablet.Shard = ""
tablet.KeyRange = key.KeyRange{}
}
return topo.UpdateTablet(ts, tablet)
}