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lrp_convergence.go
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lrp_convergence.go
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package lrp_bbs
import (
"sync"
"github.com/cloudfoundry-incubator/delta_force/delta_force"
"github.com/cloudfoundry-incubator/runtime-schema/bbs/shared"
"github.com/cloudfoundry-incubator/runtime-schema/models"
"github.com/cloudfoundry/storeadapter"
"github.com/pivotal-golang/lager"
)
type compareAndSwappableDesiredLRP struct {
OldIndex uint64
NewDesiredLRP models.DesiredLRP
}
func (bbs *LRPBBS) ConvergeLRPs() {
actualsByProcessGuid, err := bbs.pruneActualsWithMissingExecutors()
if err != nil {
bbs.logger.Error("failed-to-fetch-and-prune-actual-lrps", err)
return
}
node, err := bbs.store.ListRecursively(shared.DesiredLRPSchemaRoot)
if err != nil && err != storeadapter.ErrorKeyNotFound {
bbs.logger.Error("failed-to-fetch-desired-lrps", err)
return
}
var desiredLRPsToCAS []compareAndSwappableDesiredLRP
var keysToDelete []string
knownDesiredProcessGuids := map[string]bool{}
for _, node := range node.ChildNodes {
desiredLRP, err := models.NewDesiredLRPFromJSON(node.Value)
if err != nil {
bbs.logger.Info("pruning-invalid-desired-lrp-json", lager.Data{
"error": err.Error(),
"payload": node.Value,
})
keysToDelete = append(keysToDelete, node.Key)
continue
}
knownDesiredProcessGuids[desiredLRP.ProcessGuid] = true
actualLRPsForDesired := actualsByProcessGuid[desiredLRP.ProcessGuid]
if bbs.needsReconciliation(desiredLRP, actualLRPsForDesired) {
desiredLRPsToCAS = append(desiredLRPsToCAS, compareAndSwappableDesiredLRP{
OldIndex: node.Index,
NewDesiredLRP: desiredLRP,
})
}
}
stopLRPInstances := bbs.instancesToStop(knownDesiredProcessGuids, actualsByProcessGuid)
bbs.store.Delete(keysToDelete...)
bbs.batchCompareAndSwapDesiredLRPs(desiredLRPsToCAS)
err = bbs.RequestStopLRPInstances(stopLRPInstances)
if err != nil {
bbs.logger.Error("failed-to-request-stops", err)
}
}
func (bbs *LRPBBS) instancesToStop(knownDesiredProcessGuids map[string]bool, actualsByProcessGuid map[string][]models.ActualLRP) []models.StopLRPInstance {
var stopLRPInstances []models.StopLRPInstance
for processGuid, actuals := range actualsByProcessGuid {
if !knownDesiredProcessGuids[processGuid] {
for _, actual := range actuals {
bbs.logger.Info("detected-undesired-process", lager.Data{
"process-guid": processGuid,
"instance-guid": actual.InstanceGuid,
"index": actual.Index,
})
stopLRPInstances = append(stopLRPInstances, models.StopLRPInstance{
ProcessGuid: processGuid,
InstanceGuid: actual.InstanceGuid,
Index: actual.Index,
})
}
}
}
return stopLRPInstances
}
func (bbs *LRPBBS) needsReconciliation(desiredLRP models.DesiredLRP, actualLRPsForDesired []models.ActualLRP) bool {
var actuals delta_force.ActualInstances
for _, actualLRP := range actualLRPsForDesired {
actuals = append(actuals, delta_force.ActualInstance{
Index: actualLRP.Index,
Guid: actualLRP.InstanceGuid,
})
}
result := delta_force.Reconcile(desiredLRP.Instances, actuals)
if len(result.IndicesToStart) > 0 {
bbs.logger.Info("detected-missing-instance", lager.Data{
"process-guid": desiredLRP.ProcessGuid,
"desired-instances": desiredLRP.Instances,
"missing-indices": result.IndicesToStart,
})
}
if len(result.GuidsToStop) > 0 {
bbs.logger.Info("detected-extra-instance", lager.Data{
"process-guid": desiredLRP.ProcessGuid,
"desired-instances": desiredLRP.Instances,
"extra-guids": result.GuidsToStop,
})
}
if len(result.IndicesToStopAllButOne) > 0 {
bbs.logger.Info("detected-duplicate-instance", lager.Data{
"process-guid": desiredLRP.ProcessGuid,
"desired-instances": desiredLRP.Instances,
"duplicated-indices": result.IndicesToStopAllButOne,
})
}
return !result.Empty()
}
func (bbs *LRPBBS) pruneActualsWithMissingExecutors() (map[string][]models.ActualLRP, error) {
executorState, err := bbs.store.ListRecursively(shared.ExecutorSchemaRoot)
if err == storeadapter.ErrorKeyNotFound {
executorState = storeadapter.StoreNode{}
} else if err != nil {
bbs.logger.Error("failed-to-get-executors", err)
return nil, err
}
actuals, err := bbs.GetAllActualLRPs()
if err != nil {
bbs.logger.Error("failed-to-get-actual-lrps", err)
return nil, err
}
keysToDelete := []string{}
actualsByProcessGuid := map[string][]models.ActualLRP{}
for _, actual := range actuals {
_, executorIsAlive := executorState.Lookup(actual.ExecutorID)
if executorIsAlive {
actualsByProcessGuid[actual.ProcessGuid] = append(actualsByProcessGuid[actual.ProcessGuid], actual)
} else {
bbs.logger.Info("detected-actual-with-missing-executor", lager.Data{
"actual": actual,
"executor-id": actual.ExecutorID,
})
keysToDelete = append(keysToDelete, shared.ActualLRPSchemaPath(actual))
}
}
bbs.store.Delete(keysToDelete...)
return actualsByProcessGuid, nil
}
func (bbs *LRPBBS) batchCompareAndSwapDesiredLRPs(desiredLRPsToCAS []compareAndSwappableDesiredLRP) {
waitGroup := &sync.WaitGroup{}
waitGroup.Add(len(desiredLRPsToCAS))
for _, desiredLRPToCAS := range desiredLRPsToCAS {
desiredLRP := desiredLRPToCAS.NewDesiredLRP
newStoreNode := storeadapter.StoreNode{
Key: shared.DesiredLRPSchemaPath(desiredLRP),
Value: desiredLRP.ToJSON(),
}
go func(desiredLRPToCAS compareAndSwappableDesiredLRP, newStoreNode storeadapter.StoreNode) {
err := bbs.store.CompareAndSwapByIndex(desiredLRPToCAS.OldIndex, newStoreNode)
if err != nil {
bbs.logger.Error("failed-to-compare-and-swap", err)
}
waitGroup.Done()
}(desiredLRPToCAS, newStoreNode)
}
waitGroup.Wait()
}