// Failover promotes replicas to primary for the remaining nodes.
func Failover(cfg cbgt.Cfg, version string, server string,
options map[string]string, nodesFailover []string) (bool, error) {
mapNodesFailover := cbgt.StringsToMap(nodesFailover)
uuid := ""
indexDefs, nodeDefs, planPIndexesPrev, cas, err :=
cbgt.PlannerGetPlan(cfg, version, uuid)
if err != nil {
return false, err
}
planPIndexesCalc, err := cbgt.CalcPlan("failover",
indexDefs, nodeDefs, planPIndexesPrev, version, server, options, nil)
if err != nil {
return false, fmt.Errorf("planner: failover CalcPlan, err: %v", err)
}
planPIndexesNext := cbgt.CopyPlanPIndexes(planPIndexesPrev, version)
for planPIndexName, planPIndex := range planPIndexesNext.PlanPIndexes {
for node, planPIndexNode := range planPIndex.Nodes {
if !mapNodesFailover[node] {
continue
}
if planPIndexNode.Priority <= 0 {
// Failover'ed node used to be a primary for this
// pindex, so find a replica to promote.
promoted := ""
PROMOTE_REPLICA:
for nodePro, ppnPro := range planPIndex.Nodes {
if mapNodesFailover[nodePro] {
continue
}
if ppnPro.Priority >= 1 {
ppnPro.Priority = 0
planPIndex.Nodes[nodePro] = ppnPro
promoted = nodePro
break PROMOTE_REPLICA
}
}
// If we didn't find a replica to promote, and we're
// configured with the option to
// "failoverAssignAllPrimaries-IndexName" or
// "failoverAssignAllPrimaries" (default true), then
// assign the primary from the calculated plan.
if promoted == "" && ParseOptionsBool(options,
"failoverAssignAllPrimaries", planPIndex.IndexName, true) {
planPIndexCalc, exists :=
planPIndexesCalc.PlanPIndexes[planPIndexName]
if exists && planPIndexCalc != nil {
ASSIGN_PRIMARY:
for nodeCalc, ppnCalc := range planPIndexCalc.Nodes {
if ppnCalc.Priority <= 0 &&
!mapNodesFailover[nodeCalc] {
planPIndex.Nodes[nodeCalc] = ppnCalc
promoted = nodeCalc
break ASSIGN_PRIMARY
}
}
}
}
}
delete(planPIndex.Nodes, node)
}
}
// TODO: Missing under-replication constraint warnings.
if cbgt.SamePlanPIndexes(planPIndexesNext, planPIndexesPrev) {
return false, nil
}
_, err = cbgt.CfgSetPlanPIndexes(cfg, planPIndexesNext, cas)
if err != nil {
return false, fmt.Errorf("planner: failover could not save plan,"+
" perhaps a concurrent planner won, cas: %d, err: %v",
cas, err)
}
return true, nil
}
// Failover promotes replicas to primary for the remaining nodes.
func Failover(cfg cbgt.Cfg, version string, server string,
nodesFailover []string) (bool, error) {
mapNodesFailover := cbgt.StringsToMap(nodesFailover)
uuid := ""
indexDefs, nodeDefs, planPIndexesPrev, cas, err :=
cbgt.PlannerGetPlan(cfg, version, uuid)
if err != nil {
return false, err
}
planPIndexesCalc, err := cbgt.CalcPlan("failover",
indexDefs, nodeDefs, planPIndexesPrev, version, server)
if err != nil {
return false, fmt.Errorf("planner: failover CalcPlan, err: %v", err)
}
planPIndexesNext := cbgt.CopyPlanPIndexes(planPIndexesPrev, version)
for planPIndexName, planPIndex := range planPIndexesNext.PlanPIndexes {
for node, planPIndexNode := range planPIndex.Nodes {
if !mapNodesFailover[node] {
continue
}
if planPIndexNode.Priority <= 0 {
// Failover'ed node used to be a primary for this
// pindex, so find a replica to promote.
promoted := ""
PROMOTE_REPLICA:
for nodePro, ppnPro := range planPIndex.Nodes {
if mapNodesFailover[nodePro] {
continue
}
if ppnPro.Priority >= 1 {
ppnPro.Priority = 0
planPIndex.Nodes[nodePro] = ppnPro
promoted = nodePro
break PROMOTE_REPLICA
}
}
if promoted == "" {
// Didn't find a replica to promote, so consult the
// calculated plan for the primary assignment.
planPIndexCalc, exists :=
planPIndexesCalc.PlanPIndexes[planPIndexName]
if exists && planPIndexCalc != nil {
PROMOTE_CALC:
for nodeCalc, ppnCalc := range planPIndexCalc.Nodes {
if ppnCalc.Priority <= 0 &&
!mapNodesFailover[nodeCalc] {
planPIndex.Nodes[nodeCalc] = ppnCalc
promoted = nodeCalc
break PROMOTE_CALC
}
}
}
}
}
delete(planPIndex.Nodes, node)
}
}
// TODO: Missing under-replication constraint warnings.
if cbgt.SamePlanPIndexes(planPIndexesNext, planPIndexesPrev) {
return false, nil
}
_, err = cbgt.CfgSetPlanPIndexes(cfg, planPIndexesNext, cas)
if err != nil {
return false, fmt.Errorf("planner: failover could not save plan,"+
" perhaps a concurrent planner won, cas: %d, err: %v",
cas, err)
}
return true, nil
}
