logic

package
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 Go to latest Published: Jun 14, 2016 License: MIT Imports: 20 Imported by: 0

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Index

Constants

View Source 
const (
	MasterRecoveryGTID         MasterRecoveryType = "MasterRecoveryGTID"
	MasterRecoveryPseudoGTID                      = "MasterRecoveryPseudoGTID"
	MasterRecoveryBinlogServer                    = "MasterRecoveryBinlogServer"
)

Variables

This section is empty.

Functions

func AcknowledgeClusterRecoveries added in v1.4.468 

func AcknowledgeClusterRecoveries(clusterName string, owner string, comment string) (countAcknowledgedEntries int64, err error)

AcknowledgeClusterRecoveries marks active recoveries for given cluster as acknowledged. This also implied clearing their active period, which in turn enables further recoveries on those topologies

func AcknowledgeCrashedRecoveries added in v1.4.475 

func AcknowledgeCrashedRecoveries() (countAcknowledgedEntries int64, err error)

AcknowledgeCrashedRecoveries marks recoveries whose processing nodes has crashed as acknowledged.

func AcknowledgeInstanceCompletedRecoveries added in v1.4.500 

func AcknowledgeInstanceCompletedRecoveries(instanceKey *inst.InstanceKey, owner string, comment string) (countAcknowledgedEntries int64, err error)

AcknowledgeInstanceCompletedRecoveries marks active and COMPLETED recoveries for given instane as acknowledged. This also implied clearing their active period, which in turn enables further recoveries on those topologies

func AcknowledgeInstanceRecoveries added in v1.4.468 

func AcknowledgeInstanceRecoveries(instanceKey *inst.InstanceKey, owner string, comment string) (countAcknowledgedEntries int64, err error)

AcknowledgeInstanceRecoveries marks active recoveries for given instane as acknowledged. This also implied clearing their active period, which in turn enables further recoveries on those topologies

func AcknowledgeRecovery added in v1.4.468 

func AcknowledgeRecovery(recoveryId int64, owner string, comment string) (countAcknowledgedEntries int64, err error)

AcknowledgeRecovery acknowledges a particular recovery. This also implied clearing their active period, which in turn enables further recoveries on those topologies

func AttemptFailureDetectionRegistration added in v1.4.196 

func AttemptFailureDetectionRegistration(analysisEntry *inst.ReplicationAnalysis) (bool, error)

AttemptFailureDetectionRegistration tries to add a failure-detection entry; if this fails that means the problem has already been detected

func BeginAsyncRequest added in v1.4.424 

func BeginAsyncRequest(asyncRequest *AsyncRequest) (bool, error)

func CheckAndRecover 

func CheckAndRecover(specificInstance *inst.InstanceKey, candidateInstanceKey *inst.InstanceKey, skipProcesses bool) (recoveryAttempted bool, promotedSlaveKey *inst.InstanceKey, err error)

CheckAndRecover is the main entry point for the recovery mechanism

func ClearActiveFailureDetections added in v1.4.196 

func ClearActiveFailureDetections() error

ClearActiveFailureDetections clears the "in_active_period" flag for old-enough detections, thereby allowing for further detections on cleared instances.

func ClearActiveRecoveries 

func ClearActiveRecoveries() error

ClearActiveRecoveries clears the "in_active_period" flag for old-enough recoveries, thereby allowing for further recoveries on cleared instances.

func ContinuousAgentsPoll 

func ContinuousAgentsPoll()

ContinuousAgentsPoll starts an asynchronuous infinite process where agents are periodically investigated and their status captured, and long since unseen agents are purged and forgotten.

func ContinuousDiscovery 

func ContinuousDiscovery()

ContinuousDiscovery starts an asynchronuous infinite discovery process where instances are periodically investigated and their status captured, and long since unseen instances are purged and forgotten.

func ExpireAsyncRequests added in v1.4.424 

func ExpireAsyncRequests() error

ExpireAsyncRequests will mark "lost" entries as being completed

func ExpireBlockedRecoveries added in v1.4.468 

func ExpireBlockedRecoveries() error

ExpireBlockedRecoveries clears listing of blocked recoveries that are no longer actually blocked.

func GetCandidateSiblingOfIntermediateMaster 

func GetCandidateSiblingOfIntermediateMaster(intermediateMasterInstance *inst.Instance) (*inst.Instance, error)

GetCandidateSiblingOfIntermediateMaster chooses the best sibling of a dead intermediate master to whom the IM's slaves can be moved.

func RecoverDeadCoMaster added in v1.4.437 

func RecoverDeadCoMaster(topologyRecovery *TopologyRecovery, skipProcesses bool) (promotedSlave *inst.Instance, lostSlaves [](*inst.Instance), err error)

RecoverDeadCoMaster recovers a dead co-master, complete logic inside

func RecoverDeadIntermediateMaster 

func RecoverDeadIntermediateMaster(topologyRecovery *TopologyRecovery, skipProcesses bool) (successorInstance *inst.Instance, err error)

RecoverDeadIntermediateMaster performs intermediate master recovery; complete logic inside

func RecoverDeadMaster 

func RecoverDeadMaster(topologyRecovery *TopologyRecovery, skipProcesses bool) (promotedSlave *inst.Instance, lostSlaves [](*inst.Instance), err error)

RecoverDeadMaster recovers a dead master, complete logic inside

func RegisterBlockedRecoveries added in v1.4.468 

func RegisterBlockedRecoveries(analysisEntry *inst.ReplicationAnalysis, blockingRecoveries []TopologyRecovery) error

RegisterBlockedRecoveries writes down currently blocked recoveries, and indicates what recovery they are blocked on. Recoveries are blocked thru the in_active_period flag, which comes to avoid flapping.

func ResolveRecovery 

func ResolveRecovery(topologyRecovery *TopologyRecovery, successorInstance *inst.Instance) error

ResolveRecovery is called on completion of a recovery process and updates the recovery status. It does not clear the "active period" as this still takes place in order to avoid flapping.

func WriteAsyncRequest added in v1.4.424 

func WriteAsyncRequest(asyncRequest *AsyncRequest) error

WriteAsyncRequest

Types

type AsyncRequest added in v1.4.424 

type AsyncRequest struct {
	Id                  int64
	Story               string
	Command             string
	OperatedInstanceKey *inst.InstanceKey
	DestinationKey      *inst.InstanceKey
	Pattern             string
	GTIDHint            inst.OperationGTIDHint
}

AsyncRequest represents an entry in the async_request table

func NewAsyncRequest added in v1.4.424 

func NewAsyncRequest(story string, command string, instanceKey *inst.InstanceKey, destinationKey *inst.InstanceKey, pattern string, gtidHint inst.OperationGTIDHint) *AsyncRequest

func NewEmptyAsyncRequest added in v1.4.424 

func NewEmptyAsyncRequest() *AsyncRequest

func NewSimpleAsyncRequest added in v1.4.424 

func NewSimpleAsyncRequest(story string, command string, instanceKey *inst.InstanceKey) *AsyncRequest

func ReadPendingAsyncRequests added in v1.4.424 

func ReadPendingAsyncRequests(limit int) (res [](*AsyncRequest), err error)

type BlockedTopologyRecovery added in v1.4.468 

type BlockedTopologyRecovery struct {
	FailedInstanceKey    inst.InstanceKey
	ClusterName          string
	Analysis             inst.AnalysisCode
	LastBlockedTimestamp string
	BlockingRecoveryId   int64
}

BlockedTopologyRecovery represents an entry in the blocked_topology_recovery table

func ReadBlockedRecoveries added in v1.4.468 

func ReadBlockedRecoveries(clusterName string) ([]BlockedTopologyRecovery, error)

ReadBlockedRecoveries reads blocked recovery entries, potentially filtered by cluster name (empty to unfilter)

type InstancesByCountSlaves 

type InstancesByCountSlaves [](*inst.Instance)

InstancesByCountSlaves sorts instances by umber of slaves, descending

func (InstancesByCountSlaves) Len 

func (this InstancesByCountSlaves) Len() int

func (InstancesByCountSlaves) Less 

func (this InstancesByCountSlaves) Less(i, j int) bool

func (InstancesByCountSlaves) Swap 

func (this InstancesByCountSlaves) Swap(i, j int)

type MasterRecoveryType added in v1.4.392 

type MasterRecoveryType string

type TopologyRecovery 

type TopologyRecovery struct {
	inst.PostponedFunctionsContainer

	Id                        int64
	AnalysisEntry             inst.ReplicationAnalysis
	SuccessorKey              *inst.InstanceKey
	SuccessorAlias            string
	IsActive                  bool
	IsSuccessful              bool
	LostSlaves                inst.InstanceKeyMap
	ParticipatingInstanceKeys inst.InstanceKeyMap
	AllErrors                 []string
	RecoveryStartTimestamp    string
	RecoveryEndTimestamp      string
	ProcessingNodeHostname    string
	ProcessingNodeToken       string
	PostponedFunctions        [](func() error)
	Acknowledged              bool
	AcknowledgedAt            string
	AcknowledgedBy            string
	AcknowledgedComment       string
	LastDetectionId           int64
	RelatedRecoveryId         int64
}

TopologyRecovery represents an entry in the topology_recovery table

func AttemptRecoveryRegistration 

func AttemptRecoveryRegistration(analysisEntry *inst.ReplicationAnalysis, failIfFailedInstanceInActiveRecovery bool, failIfClusterInActiveRecovery bool) (*TopologyRecovery, error)

AttemptRecoveryRegistration tries to add a recovery entry; if this fails that means recovery is already in place.

func ForceExecuteRecovery added in v1.4.580 

func ForceExecuteRecovery(clusterName string, analysisCode inst.AnalysisCode, failedInstanceKey *inst.InstanceKey, candidateInstanceKey *inst.InstanceKey, skipProcesses bool) (recoveryAttempted bool, topologyRecovery *TopologyRecovery, err error)

ForceExecuteRecovery can be called to issue a recovery process even if analysis says there is no recovery case. The caller of this function injects the type of analysis it wishes the function to assume. By calling this function one takes responsibility for one's actions.

func ForceMasterTakeover added in v1.4.590 

func ForceMasterTakeover(clusterName string, destination *inst.Instance) (topologyRecovery *TopologyRecovery, err error)

ForceMasterTakeover *trusts* master of given cluster is dead and fails over to designated instance, which has to be its direct child.

func GracefulMasterTakeover added in v1.4.590 

func GracefulMasterTakeover(clusterName string) (topologyRecovery *TopologyRecovery, promotedMasterCoordinates *inst.BinlogCoordinates, err error)

GracefulMasterTakeover will demote master of existing topology and promote its direct replica instead. It expects that replica to have no siblings. This function is graceful in that it will first lock down the master, then wait for the designated replica to catch up with last position.

func NewTopologyRecovery added in v1.4.421 

func NewTopologyRecovery(replicationAnalysis inst.ReplicationAnalysis) *TopologyRecovery

func ReadActiveClusterRecovery 

func ReadActiveClusterRecovery(clusterName string) ([]TopologyRecovery, error)

ReadActiveRecoveries reads active recovery entry/audit entires from topology_recovery

func ReadActiveRecoveries 

func ReadActiveRecoveries() ([]TopologyRecovery, error)

ReadActiveRecoveries reads active recovery entry/audit entires from topology_recovery

func ReadCompletedRecoveries 

func ReadCompletedRecoveries(page int) ([]TopologyRecovery, error)

ReadCompletedRecoveries reads completed recovery entry/audit entires from topology_recovery

func ReadFailureDetection added in v1.4.500 

func ReadFailureDetection(detectionId int64) ([]TopologyRecovery, error)

ReadFailureDetection

func ReadInActivePeriodClusterRecovery added in v1.4.468 

func ReadInActivePeriodClusterRecovery(clusterName string) ([]TopologyRecovery, error)

ReadInActivePeriodClusterRecovery reads recoveries (possibly complete!) that are in active period. (may be used to block further recoveries on this cluster)

func ReadInActivePeriodSuccessorInstanceRecovery added in v1.4.468 

func ReadInActivePeriodSuccessorInstanceRecovery(instanceKey *inst.InstanceKey) ([]TopologyRecovery, error)

ReadInActivePeriodSuccessorInstanceRecovery reads completed recoveries for a given instance, where said instance was promoted as result, still in active period (may be used to block further recoveries should this instance die)

func ReadRecentFailureDetections added in v1.4.204 

func ReadRecentFailureDetections(page int) ([]TopologyRecovery, error)

ReadRecentFailureDetections

func ReadRecentRecoveries 

func ReadRecentRecoveries(clusterName string, unacknowledgedOnly bool, page int) ([]TopologyRecovery, error)

ReadCRecoveries reads latest recovery entries from topology_recovery

func ReadRecentlyActiveClusterRecovery 

func ReadRecentlyActiveClusterRecovery(clusterName string) ([]TopologyRecovery, error)

ReadRecentlyActiveClusterRecovery reads recently completed entries for a given cluster

func ReadRecentlyActiveInstanceRecovery 

func ReadRecentlyActiveInstanceRecovery(instanceKey *inst.InstanceKey) ([]TopologyRecovery, error)

ReadRecentlyActiveInstanceRecovery reads recently completed entries for a given instance

func ReadRecovery added in v1.4.500 

func ReadRecovery(recoveryId int64) ([]TopologyRecovery, error)

ReadRecovery reads completed recovery entry/audit entires from topology_recovery

func (*TopologyRecovery) AddError added in v1.4.421 

func (this *TopologyRecovery) AddError(err error) error

func (*TopologyRecovery) AddErrors added in v1.4.421 

func (this *TopologyRecovery) AddErrors(errs []error)

Source Files

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