func SlaveWasPromoted(ts topo.Server, mysqlDaemon mysqlctl.MysqlDaemon, tabletAlias topo.TabletAlias) error {
// We first check we don't have a master any more.
// If we do, it probably means we're not *the* master, and something
// is really wrong.
masterAddr, err := mysqlDaemon.GetMasterAddr()
if err != mysqlctl.ErrNotSlave {
return fmt.Errorf("new master is a slave: %v %v", masterAddr, err)
}
tablet, err := ts.GetTablet(tabletAlias)
if err != nil {
return err
}
return updateReplicationGraphForPromotedSlave(ts, mysqlDaemon, tablet)
}
func SlaveWasRestarted(ts topo.Server, mysqlDaemon mysqlctl.MysqlDaemon, tabletAlias topo.TabletAlias, swrd *actionnode.SlaveWasRestartedArgs) error {
tablet, err := ts.GetTablet(tabletAlias)
if err != nil {
return err
}
// check the reparent actually worked
masterAddr, err := mysqlDaemon.GetMasterAddr()
if err != nil {
return err
}
if masterAddr != swrd.ExpectedMasterAddr && masterAddr != swrd.ExpectedMasterIpAddr {
log.Errorf("SlaveWasRestarted found unexpected master %v for %v (was expecting %v or %v)", masterAddr, tabletAlias, swrd.ExpectedMasterAddr, swrd.ExpectedMasterIpAddr)
// Disabled for now
// if swrd.ContinueOnUnexpectedMaster {
// log.Errorf("ContinueOnUnexpectedMaster is set, we keep going anyway")
// } else
if swrd.ScrapStragglers {
return Scrap(ts, tablet.Alias, false)
} else {
return fmt.Errorf("Unexpected master %v for %v (was expecting %v or %v)", masterAddr, tabletAlias, swrd.ExpectedMasterAddr, swrd.ExpectedMasterIpAddr)
}
}
// Once this action completes, update authoritive tablet node first.
tablet.Parent = swrd.Parent
if tablet.Type == topo.TYPE_MASTER {
tablet.Type = topo.TYPE_SPARE
tablet.State = topo.STATE_READ_ONLY
}
err = topo.UpdateTablet(ts, tablet)
if err != nil {
return err
}
// Update the new tablet location in the replication graph now that
// we've updated the tablet.
err = topo.CreateTabletReplicationData(ts, tablet.Tablet)
if err != nil && err != topo.ErrNodeExists {
return err
}
return nil
}