// change a tablet type to RESTORE and set all the other arguments.
// from now on, we can go to:
// - back to IDLE if we don't use the tablet at all (after for instance
// a successful ReserveForRestore but a failed Snapshot)
// - to SCRAP if something in the process on the target host fails
// - to SPARE if the clone works
func (ta *TabletActor) changeTypeToRestore(tablet, sourceTablet *topo.TabletInfo, parentAlias topo.TabletAlias, keyRange key.KeyRange) error {
// run the optional preflight_assigned hook
hk := hook.NewSimpleHook("preflight_assigned")
configureTabletHook(hk, ta.tabletAlias)
if err := hk.ExecuteOptional(); err != nil {
return err
}
// change the type
tablet.Parent = parentAlias
tablet.Keyspace = sourceTablet.Keyspace
tablet.Shard = sourceTablet.Shard
tablet.Type = topo.TYPE_RESTORE
tablet.KeyRange = keyRange
tablet.DbNameOverride = sourceTablet.DbNameOverride
if err := topo.UpdateTablet(ta.ts, tablet); err != nil {
return err
}
// and create the replication graph items
return topo.CreateTabletReplicationPaths(ta.ts, tablet.Tablet)
}
// This is a quick and dirty tool to resurrect the TopologyServer data from the
// canonical data stored in the tablet nodes.
//
// cells: local vt cells to scan for all tablets
// keyspaces: list of keyspaces to rebuild
func (wr *Wrangler) RebuildReplicationGraph(cells []string, keyspaces []string) error {
if cells == nil || len(cells) == 0 {
return fmt.Errorf("must specify cells to rebuild replication graph")
}
if keyspaces == nil || len(keyspaces) == 0 {
return fmt.Errorf("must specify keyspaces to rebuild replication graph")
}
allTablets := make([]*topo.TabletInfo, 0, 1024)
for _, cell := range cells {
tablets, err := GetAllTablets(wr.ts, cell)
if err != nil {
return err
}
allTablets = append(allTablets, tablets...)
}
for _, keyspace := range keyspaces {
relog.Debug("delete keyspace shards: %v", keyspace)
if err := wr.ts.DeleteKeyspaceShards(keyspace); err != nil {
return err
}
}
keyspacesToRebuild := make(map[string]bool)
hasErr := false
mu := sync.Mutex{}
wg := sync.WaitGroup{}
for _, ti := range allTablets {
wg.Add(1)
go func(ti *topo.TabletInfo) {
defer wg.Done()
if !ti.IsInReplicationGraph() {
return
}
if !strInList(keyspaces, ti.Keyspace) {
return
}
mu.Lock()
keyspacesToRebuild[ti.Keyspace] = true
mu.Unlock()
err := topo.CreateTabletReplicationPaths(wr.ts, ti.Tablet)
if err != nil {
mu.Lock()
hasErr = true
mu.Unlock()
relog.Warning("failed creating replication path: %v", err)
}
}(ti)
}
wg.Wait()
for keyspace, _ := range keyspacesToRebuild {
wg.Add(1)
go func(keyspace string) {
defer wg.Done()
if err := wr.RebuildKeyspaceGraph(keyspace, nil); err != nil {
mu.Lock()
hasErr = true
mu.Unlock()
relog.Warning("RebuildKeyspaceGraph(%v) failed: %v", keyspace, err)
return
}
}(keyspace)
}
wg.Wait()
if hasErr {
return fmt.Errorf("some errors occurred rebuilding replication graph, consult log")
}
return nil
}