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 Go to latest Published: Jul 3, 2015 License: Apache-2.0 Imports: 18 Imported by: 0

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Constants

View Source 
const (
	NoProblem                                 AnalysisCode = "NoProblem"
	DeadMasterWithoutSlaves                                = "DeadMasterWithoutSlaves"
	DeadMaster                                             = "DeadMaster"
	DeadMasterAndSlaves                                    = "DeadMasterAndSlaves"
	DeadMasterAndSomeSlaves                                = "DeadMasterAndSomeSlaves"
	UnreachableMaster                                      = "UnreachableMaster"
	AllMasterSlavesNotReplicating                          = "AllMasterSlavesNotReplicating"
	MasterWithoutSlaves                                    = "MasterWithoutSlaves"
	DeadCoMaster                                           = "DeadCoMaster"
	UnreachableCoMaster                                    = "UnreachableCoMaster"
	AllCoMasterSlavesNotReplicating                        = "AllCoMasterSlavesNotReplicating"
	DeadIntermediateMaster                                 = "DeadIntermediateMaster"
	DeadIntermediateMasterAndSomeSlaves                    = "DeadIntermediateMasterAndSomeSlaves"
	UnreachableIntermediateMaster                          = "UnreachableIntermediateMaster"
	AllIntermediateMasterSlavesNotReplicating              = "AllIntermediateMasterSlavesNotReplicating"
	FirstTierSlaveFailingToConnectToMaster                 = "FirstTierSlaveFailingToConnectToMaster"
	MaxscaleFailingToConnectToMaster                       = "MaxscaleFailingToConnectToMaster"
)

Variables

This section is empty.

Functions

func ASCIITopology 

func ASCIITopology(instanceKey *InstanceKey, historyTimestampPattern string) (string, error)

ASCIITopology returns a string representation of the topology of given instance.

func ApplyClusterAlias 

func ApplyClusterAlias(clusterInfo *ClusterInfo)

func ApplyPoolInstances 

func ApplyPoolInstances(pool string, instancesList string) error

func AuditOperation 

func AuditOperation(auditType string, instanceKey *InstanceKey, message string) error

AuditOperation creates and writes a new audit entry by given params

func BeginBoundedMaintenance 

func BeginBoundedMaintenance(instanceKey *InstanceKey, owner string, reason string, durationSeconds uint) (int64, error)

BeginBoundedMaintenance will make new maintenance entry for given instanceKey.

func BeginDowntime 

func BeginDowntime(instanceKey *InstanceKey, owner string, reason string, durationSeconds uint) error

BeginDowntime will make mark an instance as downtimed (or override existing downtime period)

func BeginMaintenance 

func BeginMaintenance(instanceKey *InstanceKey, owner string, reason string) (int64, error)

BeginMaintenance will make new maintenance entry for given instanceKey. Maintenance time is unbounded

func DeleteInvalidHostnameResolves 

func DeleteInvalidHostnameResolves() error

DeleteInvalidHostnameResolves removes invalid resolves. At this time these are: - infinite loop resolves (A->B and B->A), remove earlier mapping

func DeregisterHostnameUnresolve 

func DeregisterHostnameUnresolve(instanceKey *InstanceKey) error

DeregisterHostnameUnresolve removes an unresovle entry

func EndDowntime 

func EndDowntime(instanceKey *InstanceKey) error

EndDowntime will remove downtime flag from an instance

func EndMaintenance 

func EndMaintenance(maintenanceToken int64) error

EndMaintenance will terminate an active maintenance via maintenanceToken

func EndMaintenanceByInstanceKey 

func EndMaintenanceByInstanceKey(instanceKey *InstanceKey) error

EndMaintenanceByInstanceKey will terminate an active maintenance using given instanceKey as hint

func ExecDBWriteFunc 

func ExecDBWriteFunc(f func() error) error

ExecDBWriteFunc chooses how to execute a write onto the database: whether synchronuously or not

func ExecInstance 

func ExecInstance(instanceKey *InstanceKey, query string, args ...interface{}) (sql.Result, error)

ExecInstance executes a given query on the given MySQL topology instance

func ExecInstanceNoPrepare 

func ExecInstanceNoPrepare(instanceKey *InstanceKey, query string, args ...interface{}) (sql.Result, error)

ExecInstanceNoPrepare executes a given query on the given MySQL topology instance, without using prepared statements

func ExecuteOnTopology 

func ExecuteOnTopology(f func())

ExecuteOnTopology will execute given function while maintaining concurrency limit on topology servers. It is safe in the sense that we will not leak tokens.

func ExpireCandidateInstances 

func ExpireCandidateInstances() error

RegisterCandidateInstance markes a given instance as suggested for successoring a master in the event of failover.

func ExpireDowntime 

func ExpireDowntime() error

ExpireDowntime will remove the maintenance flag on old downtimes

func ExpireHostnameUnresolve 

func ExpireHostnameUnresolve() error

ExpireHostnameUnresolve expires hostname_unresolve entries that haven't been updated recently.

func ExpireMaintenance 

func ExpireMaintenance() error

ExpireMaintenance will remove the maintenance flag on old maintenances and on bounded maintenances

func FlushBinaryLogs 

func FlushBinaryLogs(instanceKey *InstanceKey) error

FlushBinaryLogs attempts a 'FLUSH BINARY LOGS' statement on the given instance.

func ForgetExpiredHostnameResolves 

func ForgetExpiredHostnameResolves() error

ForgetExpiredHostnameResolves

func ForgetInstance 

func ForgetInstance(instanceKey *InstanceKey) error

ForgetInstance removes an instance entry from the orchestrator backed database. It may be auto-rediscovered through topology or requested for discovery by multiple means.

func ForgetLongUnseenInstances 

func ForgetLongUnseenInstances() error

ForgetLongUnseenInstances will remove entries of all instacnes that have long since been last seen.

func ForgetUnseenInstancesDifferentlyResolved 

func ForgetUnseenInstancesDifferentlyResolved() error

ForgetUnseenInstancesDifferentlyResolved will purge instances which are invalid, and whose hostname appears on the hostname_resolved table; this means some time in the past their hostname was unresovled, and now resovled to a different value; the old hostname is never accessed anymore and the old entry should be removed.

func GetCNAME 

func GetCNAME(hostname string) (string, error)

GetCNAME resolves an IP or hostname into a normalized valid CNAME

func GetCandidateSlave 

func GetCandidateSlave(masterKey *InstanceKey, forRematchPurposes bool) (*Instance, [](*Instance), [](*Instance), [](*Instance), error)

GetCandidateSlave chooses the best slave to promote given a (possibly dead) master

func GetClusterByAlias 

func GetClusterByAlias(alias string) (string, error)

GetClusterByAlias returns the cluster name associated with given alias. The function returns with error when: - No cluster is associated with the alias - More than one cluster is associated with the alias

func GetClusterHeuristicLag 

func GetClusterHeuristicLag(clusterName string) (int64, error)

GetClusterHeuristicLag returns a heuristic lag for a cluster, based on its OSC slaves

func GetMaintenanceOwner 

func GetMaintenanceOwner() string

func HostnameResolveCache 

func HostnameResolveCache() (map[string]*cache.Item, error)

func InjectUnseenMasters 

func InjectUnseenMasters() error

InjectUnseenMasters will review masters of instances that are known to be replication, yet which are not listed in database_instance. Since their slaves are listed as replicating, we can assume that such masters actually do exist: we shall therefore inject them with minimal details into the database_instance table.

func InstanceIsMasterOf 

func InstanceIsMasterOf(instance0, instance1 *Instance) bool

InstanceIsMasterOf checks whether an instance is the master of another

func InstancesAreSiblings 

func InstancesAreSiblings(instance0, instance1 *Instance) bool

InstancesAreSiblings checks whether both instances are replicating from same master

func LoadHostnameResolveCacheFromDatabase 

func LoadHostnameResolveCacheFromDatabase() error

func MatchBelow 

func MatchBelow(instanceKey, otherKey *InstanceKey, requireInstanceMaintenance bool, requireOtherMaintenance bool) (*Instance, *BinlogCoordinates, error)

MatchBelow will attempt moving instance indicated by instanceKey below its the one indicated by otherKey. The refactoring is based on matching binlog entries, not on "classic" positions comparisons. The "other instance" could be the sibling of the moving instance any of its ancestors. It may actuall be a cousin of some sort (though unlikely). The only important thing is that the "other instance" is more advanced in replication than given instance.

func MatchUp 

func MatchUp(instanceKey *InstanceKey, requireInstanceMaintenance bool, requireOtherMaintenance bool) (*Instance, *BinlogCoordinates, error)

MatchUp will move a slave up the replication chain, so that it becomes sibling of its master, via Pseudo-GTID

func MatchUpSlaves 

func MatchUpSlaves(masterKey *InstanceKey, pattern string) ([](*Instance), *Instance, error, []error)

MatchUpSlaves will move all slaves of given master up the replication chain, so that they become siblings of their master. This should be called when the local master dies, and all its slaves are to be resurrected via Pseudo-GTID

func MoveUpSlaves 

func MoveUpSlaves(instanceKey *InstanceKey, pattern string) ([](*Instance), *Instance, error, []error)

MoveUpSlaves will attempt moving up all slaves of a given instance, at the same time. Clock-time, this is fater than moving one at a time. However this means all slaves of the given instance, and the instance itself, will all stop replicating together.

func MultiMatchBelow 

func MultiMatchBelow(slaves [](*Instance), belowKey *InstanceKey, slavesAlreadyStopped bool) ([](*Instance), *Instance, error, []error)

MultiMatchBelow will efficiently match multiple slaves below a given instance. It is assumed that all given slaves are siblings

func MultiMatchSlaves 

func MultiMatchSlaves(masterKey *InstanceKey, belowKey *InstanceKey, pattern string) ([](*Instance), *Instance, error, []error)

MultiMatchSlaves will match (via pseudo-gtid) all slaves of given master below given instance.

func PopulateInstancesAgents 

func PopulateInstancesAgents(instances [](*Instance)) error

PopulateInstancesAgents will fill in extra data acquired from agents for given instances At current this is the number of snapshots. This isn't too pretty; it's a push-into-instance-data-that-belongs-to-agent thing. Originally the need was to visually present the number of snapshots per host on the web/cluster page, which indeed proves to be useful in our experience.

func ReadClusterAliases 

func ReadClusterAliases() error

ReadClusterAliases reads the entrie cluster name aliases mapping

func ReadClusterByAlias 

func ReadClusterByAlias(alias string) (string, error)

ReadClusterAliases reads the entrie cluster name aliases mapping

func ReadClusterNameByMaster 

func ReadClusterNameByMaster(instanceKey *InstanceKey, masterKey *InstanceKey) (clusterName string, replicationDepth uint, isCoMaster bool, err error)

ReadClusterNameByMaster will return the cluster name for a given instance by looking at its master and getting it from there. It is a non-recursive function and so-called-recursion is performed upon periodic reading of instances.

func ReadClusters 

func ReadClusters() ([]string, error)

ReadClusters reads names of all known clusters

func ReadCountMySQLSnapshots 

func ReadCountMySQLSnapshots(hostnames []string) (map[string]int, error)

ReadCountMySQLSnapshots is a utility method to return registered number of snapshots for a given list of hosts

func ReadResolvedHostname 

func ReadResolvedHostname(hostname string) (string, error)

ReadResolvedHostname returns the resolved hostname given a hostname, or empty if not exists

func RefreshTopologyInstances 

func RefreshTopologyInstances(instances [](*Instance))

RefreshTopologyInstances will do a blocking (though concurrent) refresh of all given instances

func RegisterCandidateInstance 

func RegisterCandidateInstance(instanceKey *InstanceKey) error

RegisterCandidateInstance markes a given instance as suggested for successoring a master in the event of failover.

func RegisterHostnameUnresolve 

func RegisterHostnameUnresolve(instanceKey *InstanceKey, unresolvedHostname string) error

RegisterHostnameUnresolve upserts an entry in hostname_unresolve

func RegroupSlaves 

func RegroupSlaves(masterKey *InstanceKey, onCandidateSlaveChosen func(*Instance)) ([](*Instance), [](*Instance), [](*Instance), *Instance, error)

RegroupSlaves will choose a candidate slave of a given instance, and enslave its siblings using either simple CHANGE MASTER TO, where possible, or pseudo-gtid

func RematchSlave 

func RematchSlave(instanceKey *InstanceKey, requireInstanceMaintenance bool, requireOtherMaintenance bool) (*Instance, *BinlogCoordinates, error)

RematchSlave will re-match a slave to its master, using pseudo-gtid

func ResetHostnameResolveCache 

func ResetHostnameResolveCache() error

func ResolveHostname 

func ResolveHostname(hostname string) (string, error)

Attempt to resolve a hostname. This may returned a database cached hostname or otherwise it may resolve the hostname via CNAME

func ReviewUnseenInstances 

func ReviewUnseenInstances() error

ReviewUnseenInstances reviews instances that have not been seen (suposedly dead) and updates some of their data

func ScanInstanceRow 

func ScanInstanceRow(instanceKey *InstanceKey, query string, dest ...interface{}) error

ScanInstanceRow executes a read-a-single-row query on a given MySQL topology instance

func SetClusterAlias 

func SetClusterAlias(clusterName string, alias string) error

SetClusterAlias will write (and override) a single cluster name mapping

func SetMaintenanceOwner 

func SetMaintenanceOwner(owner string)

func SnapshotTopologies 

func SnapshotTopologies() error

SnapshotTopologies records topology graph for all existing topologies

func StartSlaves 

func StartSlaves(slaves [](*Instance))

StartSlaves will do concurrent start-slave

func UpdateInstanceLastAttemptedCheck 

func UpdateInstanceLastAttemptedCheck(instanceKey *InstanceKey) error

UpdateInstanceLastAttemptedCheck updates the last_attempted_check timestamp in the orchestrator backed database for a given instance. This is used as a failsafe mechanism in case access to the instance gets hung (it happens), in which case the entire ReadTopology gets stuck (and no, connection timeout nor driver timeouts don't help. Don't look at me, the world is a harsh place to live in). And so we make sure to note down *before* we even attempt to access the instance; and this raises a red flag when we wish to access the instance again: if last_attempted_check is *newer* than last_checked, that's bad news and means we have a "hanging" issue.

func UpdateInstanceLastChecked 

func UpdateInstanceLastChecked(instanceKey *InstanceKey) error

UpdateInstanceLastChecked updates the last_check timestamp in the orchestrator backed database for a given instance

func UpdateResolvedHostname 

func UpdateResolvedHostname(hostname string, resolvedHostname string) bool

UpdateResolvedHostname will store the given resolved hostname in cache Returns false when the key already existed with same resolved value (similar to AFFECTED_ROWS() in mysql)

func WriteClusterAlias 

func WriteClusterAlias(clusterName string, alias string) error

WriteClusterAlias will write (and override) a single cluster name mapping

func WriteLongRunningProcesses 

func WriteLongRunningProcesses(instanceKey *InstanceKey, processes []Process) error

WriteLongRunningProcesses rewrites current state of long running processes for given instance

func WriteResolvedHostname 

func WriteResolvedHostname(hostname string, resolvedHostname string) error

WriteResolvedHostname stores a hostname and the resolved hostname to backend database

Types

type AnalysisCode 

type AnalysisCode string

type Audit 

type Audit struct {
	AuditId          int64
	AuditTimestamp   string
	AuditType        string
	AuditInstanceKey InstanceKey
	Message          string
}

Audit presents a single audit entry (namely in the database)

func ReadRecentAudit 

func ReadRecentAudit(page int) ([]Audit, error)

ReadRecentAudit returns a list of audit entries order chronologically descending, using page number.

type BinlogCoordinates 

type BinlogCoordinates struct {
	LogFile string
	LogPos  int64
	Type    BinlogType
}

BinlogCoordinates described binary log coordinates in the form of log file & log position.

func FindLastPseudoGTIDEntry 

func FindLastPseudoGTIDEntry(instance *Instance, recordedInstanceRelayLogCoordinates BinlogCoordinates, exhaustiveSearch bool, expectedBinlogFormat *string) (*BinlogCoordinates, string, error)

FindLastPseudoGTIDEntry will search an instance's binary logs or relay logs for the last pseudo-GTID entry, and return found coordinates as well as entry text

func GetNextBinlogCoordinatesToMatch 

func GetNextBinlogCoordinatesToMatch(instance *Instance, instanceCoordinates BinlogCoordinates, recordedInstanceRelayLogCoordinates BinlogCoordinates,
	other *Instance, otherCoordinates BinlogCoordinates) (*BinlogCoordinates, int, error)

GetNextBinlogCoordinatesToMatch is given a twin-coordinates couple for a would-be slave (instanceKey) and another instance (otherKey). This is part of the match-below process, and is the heart of the operation: matching the binlog events starting the twin-coordinates (where both share the same Pseudo-GTID) until "instance" runs out of entries, hopefully before "other" runs out. If "other" runs out that means "instance" is more advanced in replication than "other", in which case we can't turn it into a slave of "other". Otherwise "instance" will point to the *next* binlog entry in "other"

func SearchPseudoGTIDEntryInBinlog 

func SearchPseudoGTIDEntryInBinlog(instanceKey *InstanceKey, binlog string, entryText string) (BinlogCoordinates, bool, error)

Given a binlog entry text (query), search it in the given binary log of a given instance

func SearchPseudoGTIDEntryInInstance 

func SearchPseudoGTIDEntryInInstance(instance *Instance, entryText string) (*BinlogCoordinates, error)

SearchPseudoGTIDEntryInInstance will search for a specific text entry within the binary logs of a given instance.

func (*BinlogCoordinates) DisplayString 

func (this *BinlogCoordinates) DisplayString() string

DisplayString returns a user-friendly string representation of these coordinates

func (*BinlogCoordinates) Equals 

func (this *BinlogCoordinates) Equals(other *BinlogCoordinates) bool

Equals tests equality of this corrdinate and another one.

func (*BinlogCoordinates) FileSmallerThan 

func (this *BinlogCoordinates) FileSmallerThan(other *BinlogCoordinates) bool

SmallerThan returns true if this coordinate is strictly smaller than the other.

func (*BinlogCoordinates) NextFileCoordinates 

func (this *BinlogCoordinates) NextFileCoordinates() (BinlogCoordinates, error)

PreviousFileCoordinates guesses the filename of the previous binlog/relaylog

func (*BinlogCoordinates) PreviousFileCoordinates 

func (this *BinlogCoordinates) PreviousFileCoordinates() (BinlogCoordinates, error)

PreviousFileCoordinates guesses the filename of the previous binlog/relaylog

func (*BinlogCoordinates) SmallerThan 

func (this *BinlogCoordinates) SmallerThan(other *BinlogCoordinates) bool

SmallerThan returns true if this coordinate is strictly smaller than the other.

type BinlogEvent 

type BinlogEvent struct {
	Coordinates  BinlogCoordinates
	NextEventPos int64
	EventType    string
	Info         string
}

func (*BinlogEvent) NextBinlogCoordinates 

func (this *BinlogEvent) NextBinlogCoordinates() BinlogCoordinates

func (*BinlogEvent) NormalizeInfo 

func (this *BinlogEvent) NormalizeInfo()

type BinlogEventCursor 

type BinlogEventCursor struct {
	// contains filtered or unexported fields
}

func NewBinlogEventCursor 

func NewBinlogEventCursor(startCoordinates BinlogCoordinates, fetchNextEventsFunc func(BinlogCoordinates) ([]BinlogEvent, error)) BinlogEventCursor

fetchNextEventsFunc expected to return events starting at a given position, and automatically fetch those from next binary log when no more rows are found in current log. It is expected to return empty array with no error upon end of binlogs It is expected to return error upon error...

type BinlogType 

type BinlogType int
const (
	BinaryLog BinlogType = iota
	RelayLog
)

type ClusterInfo 

type ClusterInfo struct {
	ClusterName                            string
	ClusterAlias                           string // Human friendly alias
	CountInstances                         uint
	HeuristicLag                           int64
	HasAutomatedMasterRecovery             bool
	HasAutomatedIntermediateMasterRecovery bool
}

ClusterInfo makes for a cluster status/info summary

func ReadClusterInfo 

func ReadClusterInfo(clusterName string) (*ClusterInfo, error)

ReadClusterInfo reads some info about a given cluster

func ReadClustersInfo 

func ReadClustersInfo() ([]ClusterInfo, error)

ReadClustersInfo reads names of all known clusters and some aggregated info

func (*ClusterInfo) ReadRecoveryInfo 

func (this *ClusterInfo) ReadRecoveryInfo()

ReadRecoveryInfo

type ClusterPoolInstance 

type ClusterPoolInstance struct {
	ClusterName  string
	ClusterAlias string
	Pool         string
	Hostname     string
	Port         int
}

ClusterPoolInstance is an instance mapping a cluster, pool & instance

func ReadAllClusterPoolInstances 

func ReadAllClusterPoolInstances() ([](*ClusterPoolInstance), error)

type HostnameResolve 

type HostnameResolve struct {
	// contains filtered or unexported fields
}

type Instance 

type Instance struct {
	Key                    InstanceKey
	Uptime                 uint
	ServerID               uint
	Version                string
	ReadOnly               bool
	Binlog_format          string
	LogBinEnabled          bool
	LogSlaveUpdatesEnabled bool
	SelfBinlogCoordinates  BinlogCoordinates
	MasterKey              InstanceKey
	Slave_SQL_Running      bool
	Slave_IO_Running       bool
	HasReplicationFilters  bool
	SupportsOracleGTID     bool
	UsingOracleGTID        bool
	UsingMariaDBGTID       bool
	UsingPseudoGTID        bool
	ReadBinlogCoordinates  BinlogCoordinates
	ExecBinlogCoordinates  BinlogCoordinates
	RelaylogCoordinates    BinlogCoordinates
	LastSQLError           string
	LastIOError            string
	SecondsBehindMaster    sql.NullInt64
	SQLDelay               uint

	SlaveLagSeconds     sql.NullInt64
	SlaveHosts          InstanceKeyMap
	ClusterName         string
	DataCenter          string
	PhysicalEnvironment string
	ReplicationDepth    uint
	IsCoMaster          bool

	IsLastCheckValid     bool
	IsUpToDate           bool
	IsRecentlyChecked    bool
	SecondsSinceLastSeen sql.NullInt64
	CountMySQLSnapshots  int

	IsCandidate        bool
	UnresolvedHostname string
}

Instance represents a database instance, including its current configuration & status. It presents important replication configuration and detailed replication status.

func ChangeMasterTo 

func ChangeMasterTo(instanceKey *InstanceKey, masterKey *InstanceKey, masterBinlogCoordinates *BinlogCoordinates, skipUnresolve bool) (*Instance, error)

ChangeMasterTo changes the given instance's master according to given input.

func DetachSlave 

func DetachSlave(instanceKey *InstanceKey) (*Instance, error)

DetachSlave detaches a slave from replication; forcibly corrupting the binlog coordinates (though in such way that is reversible)

func DetachSlaveOperation 

func DetachSlaveOperation(instanceKey *InstanceKey) (*Instance, error)

DetachSlaveOperation will detach a slave from its master by forcibly corrupting its replication coordinates

func EnslaveMaster 

func EnslaveMaster(instanceKey *InstanceKey) (*Instance, error)

EnslaveMaster will move an instance up the chain and cause its master to become its slave. It's almost a role change, just that other slaves of either 'instance' or its master are currently unaffected (they continue replicate without change) Note that the master must itself be a slave; however the grandparent does not necessarily have to be reachable and can in fact be dead.

func EnslaveSiblings 

func EnslaveSiblings(instanceKey *InstanceKey) (*Instance, int, error)

EnslaveSiblings is a convenience method for turning sublings of a slave to be its subordinates. This uses normal connected replication (does not utilize Pseudo-GTID)

func FindInstances 

func FindInstances(regexpPattern string) ([](*Instance), error)

FindInstances reads all instances whose name matches given pattern

func GetClusterOSCSlaves 

func GetClusterOSCSlaves(clusterName string) ([](*Instance), error)

GetClusterOSCSlaves returns a heuristic list of slaves which are fit as controll slaves for an OSC operation. These would be intermediate masters

func GetInstanceMaster 

func GetInstanceMaster(instance *Instance) (*Instance, error)

GetInstanceMaster synchronously reaches into the replication topology and retrieves master's data

func KillQuery 

func KillQuery(instanceKey *InstanceKey, process int64) (*Instance, error)

KillQuery stops replication on a given instance

func MakeCoMaster 

func MakeCoMaster(instanceKey *InstanceKey) (*Instance, error)

MakeCoMaster will attempt to make an instance co-master with its master, by making its master a slave of its own. This only works out if the master is not replicating; the master does not have a known master (it may have an unknown master).

func MakeLocalMaster 

func MakeLocalMaster(instanceKey *InstanceKey) (*Instance, error)

MakeLocalMaster promotes a slave above its master, making it slave of its grandparent, while also enslaving its siblings. This serves as a convenience method to recover replication when a local master fails; the instance promoted is one of its slaves, which is most advanced among its siblings. This method utilizes Pseudo GTID

func MakeMaster 

func MakeMaster(instanceKey *InstanceKey) (*Instance, error)

MakeMaster will take an instance, make all its siblings its slaves (via pseudo-GTID) and make it master (stop its replicaiton, make writeable).

func MasterPosWait 

func MasterPosWait(instanceKey *InstanceKey, binlogCoordinates *BinlogCoordinates) (*Instance, error)

MasterPosWait issues a MASTER_POS_WAIT() an given instance according to given coordinates.

func MoveBelow 

func MoveBelow(instanceKey, siblingKey *InstanceKey) (*Instance, error)

MoveBelow will attempt moving instance indicated by instanceKey below its supposed sibling indicated by sinblingKey. It will perform all safety and sanity checks and will tamper with this instance's replication as well as its sibling.

func MoveBelowViaGTID 

func MoveBelowViaGTID(instance, otherInstance *Instance) (*Instance, error)

MoveBelowViaGTID will attempt moving instance indicated by instanceKey below another instance using either Oracle GTID or MaroaDB GTID.

func MoveUp 

func MoveUp(instanceKey *InstanceKey) (*Instance, error)

MoveUp will attempt moving instance indicated by instanceKey up the topology hierarchy. It will perform all safety and sanity checks and will tamper with this instance's replication as well as its master.

func NewInstance 

func NewInstance() *Instance

NewInstance creates a new, empty instance

func ReadClusterCandidateInstances 

func ReadClusterCandidateInstances(clusterName string) ([](*Instance), error)

ReadClusterCandidateInstances reads cluster instances which are also marked as candidates

func ReadClusterInstances 

func ReadClusterInstances(clusterName string) ([](*Instance), error)

ReadClusterInstances reads all instances of a given cluster

func ReadHistoryClusterInstances 

func ReadHistoryClusterInstances(clusterName string, historyTimestampPattern string) ([](*Instance), error)

ReadHistoryClusterInstances reads (thin) instances from history

func ReadInstance 

func ReadInstance(instanceKey *InstanceKey) (*Instance, bool, error)

ReadInstance reads an instance from the orchestrator backend database

func ReadProblemInstances 

func ReadProblemInstances() ([](*Instance), error)

ReadProblemInstances reads all instances with problems

func ReadSlaveInstances 

func ReadSlaveInstances(masterKey *InstanceKey) ([](*Instance), error)

ReadSlaveInstances reads slaves of a given master

func ReadTopologyInstance 

func ReadTopologyInstance(instanceKey *InstanceKey) (*Instance, error)

ReadTopologyInstance connects to a topology MySQL instance and reads its configuration and replication status. It writes read info into orchestrator's backend.

func ReadUnseenInstances 

func ReadUnseenInstances() ([](*Instance), error)

ReadUnseenInstances reads all instances which were not recently seen

func ReattachSlave 

func ReattachSlave(instanceKey *InstanceKey) (*Instance, error)

ReattachSlave restores a detahced slave back into replication

func ReattachSlaveOperation 

func ReattachSlaveOperation(instanceKey *InstanceKey) (*Instance, error)

ReattachSlaveOperation will detach a slave from its master by forcibly corrupting its replication coordinates

func RefreshInstanceSlaveHosts 

func RefreshInstanceSlaveHosts(instanceKey *InstanceKey) (*Instance, error)

RefreshInstanceSlaveHosts is a workaround for a bug in MySQL where SHOW SLAVE HOSTS continues to present old, long disconnected slaves. It turns out issuing a couple FLUSH commands mitigates the problem.

func RefreshTopologyInstance 

func RefreshTopologyInstance(instanceKey *InstanceKey) (*Instance, error)

RefreshTopologyInstance will synchronuously re-read topology instance

func Repoint 

func Repoint(instanceKey *InstanceKey, masterKey *InstanceKey) (*Instance, error)

Repoint connects a slave to a master using its exact same executing coordinates. The given masterKey can be null, in which case the existing master is used. Two use cases: - masterKey is nil: use case is corrupted relay logs on slave - masterKey is not nil: using MaxScale and Binlog servers (coordinates remain the same)

func RepointSlaves 

func RepointSlaves(instanceKey *InstanceKey, pattern string) ([](*Instance), error, []error)

RepointSlaves sequentially repoints all slaves of a given instance onto its existing master.

func ResetSlave 

func ResetSlave(instanceKey *InstanceKey) (*Instance, error)

ResetSlave resets a slave, breaking the replication

func ResetSlaveOperation 

func ResetSlaveOperation(instanceKey *InstanceKey) (*Instance, error)

ResetSlaveOperation will reset a slave

func SearchInstances 

func SearchInstances(searchString string) ([](*Instance), error)

SearchInstances reads all instances qualifying for some searchString

func SetReadOnly 

func SetReadOnly(instanceKey *InstanceKey, readOnly bool) (*Instance, error)

SetReadOnly sets or clears the instance's global read_only variable

func SkipQuery 

func SkipQuery(instanceKey *InstanceKey) (*Instance, error)

SkipQuery skip a single query in a failed replication instance

func StartSlave 

func StartSlave(instanceKey *InstanceKey) (*Instance, error)

StartSlave starts replication on a given instance

func StartSlaveUntilMasterCoordinates 

func StartSlaveUntilMasterCoordinates(instanceKey *InstanceKey, masterCoordinates *BinlogCoordinates) (*Instance, error)

StartSlaveUntilMasterCoordinates issuesa START SLAVE UNTIL... statement on given instance

func StopSlave 

func StopSlave(instanceKey *InstanceKey) (*Instance, error)

StopSlave stops replication on a given instance

func StopSlaveNicely 

func StopSlaveNicely(instanceKey *InstanceKey, timeout time.Duration) (*Instance, error)

StopSlaveNicely stops a slave such that SQL_thread and IO_thread are aligned (i.e. SQL_thread consumes all relay log entries) It will actually START the sql_thread even if the slave is completely stopped.

func StopSlavesNicely 

func StopSlavesNicely(slaves [](*Instance), timeout time.Duration) [](*Instance)

StopSlavesNicely will attemt to stop all given slaves nicely, up to timeout

func (*Instance) AddSlaveKey 

func (this *Instance) AddSlaveKey(slaveKey *InstanceKey)

AddSlaveKey adds a slave to the list of this instance's slaves.

func (*Instance) CanMove 

func (this *Instance) CanMove() (bool, error)

CanMove returns true if this instance's state allows it to be repositioned. For example, if this instance lags too much, it will not be moveable.

func (*Instance) CanMoveAsCoMaster 

func (this *Instance) CanMoveAsCoMaster() (bool, error)

CanMoveAsCoMaster returns true if this instance's state allows it to be repositioned.

func (*Instance) CanMoveViaMatch 

func (this *Instance) CanMoveViaMatch() (bool, error)

CanMoveViaMatch returns true if this instance's state allows it to be repositioned via pseudo-GTID matching

func (*Instance) CanReplicateFrom 

func (this *Instance) CanReplicateFrom(other *Instance) (bool, error)

CanReplicateFrom uses heursitics to decide whether this instacne can practically replicate from other instance. Checks are made to binlog format, version number, binary logs etc.

func (*Instance) Equals 

func (this *Instance) Equals(other *Instance) bool

Equals tests that this instance is the same instance as other. The function does not test configuration or status.

func (*Instance) GetNextBinaryLog 

func (this *Instance) GetNextBinaryLog(binlogCoordinates BinlogCoordinates) (BinlogCoordinates, error)

GetNextBinaryLog returns the successive, if any, binary log file to the one given

func (*Instance) GetSlaveHostsAsJson 

func (this *Instance) GetSlaveHostsAsJson() string

GetSlaveHostsAsJson Marshals slaves list a JSON

func (*Instance) HasReasonableMaintenanceReplicationLag 

func (this *Instance) HasReasonableMaintenanceReplicationLag() bool

HasReasonableMaintenanceReplicationLag returns true when the slave lag is reasonable, and maintenance operations should have a green light to go.

func (*Instance) HumanReadableDescription 

func (this *Instance) HumanReadableDescription() string

HumanReadableDescription returns a simple readable string describing the status, version, etc. properties of this instance

func (*Instance) IsMariaDB 

func (this *Instance) IsMariaDB() bool

IsMariaDB checkes whether this is any version of MariaDB

func (*Instance) IsMasterOf 

func (this *Instance) IsMasterOf(slave *Instance) bool

IsSlaveOf returns true if this i supposed master of given slave

func (*Instance) IsMaxScale 

func (this *Instance) IsMaxScale() bool

IsMariaDB checkes whether this is any version of MaScale

func (*Instance) IsSlave 

func (this *Instance) IsSlave() bool

IsSlave makes simple heuristics to decide whether this insatnce is a slave of another instance

func (*Instance) IsSlaveOf 

func (this *Instance) IsSlaveOf(master *Instance) bool

IsSlaveOf returns true if this instance claims to replicate from given master

func (*Instance) IsSmallerMajorVersion 

func (this *Instance) IsSmallerMajorVersion(other *Instance) bool

MajorVersion tests this instance against another and returns true if this instance is of a smaller "major" varsion. e.g. 5.5.36 is NOT a smaller major version as comapred to 5.5.36, but IS as compared to 5.6.9

func (*Instance) MajorVersion 

func (this *Instance) MajorVersion() []string

MajorVersion returns this instance's major version number (e.g. for 5.5.36 it returns "5.5")

func (*Instance) ReadSlaveHostsFromJson 

func (this *Instance) ReadSlaveHostsFromJson(jsonString string) error

ReadSlaveHostsFromJson unmarshalls a json to read list of slaves

func (*Instance) SQLThreadUpToDate 

func (this *Instance) SQLThreadUpToDate() bool

SQLThreadUpToDate returns true when the instance had consumed all relay logs.

func (*Instance) SlaveRunning 

func (this *Instance) SlaveRunning() bool

SlaveRunning returns true when this instance's status is of a replicating slave.

func (*Instance) StatusString 

func (this *Instance) StatusString() string

StatusString returns a human readable description of this instance's status

func (*Instance) UsingGTID 

func (this *Instance) UsingGTID() bool

UsingGTID returns true when this slave is currently replicating via GTID (either Oracle or MariaDB)

type InstanceKey 

type InstanceKey struct {
	Hostname string
	Port     int
}

InstanceKey is an instance indicator, identifued by hostname and port

func NewInstanceKeyFromStrings 

func NewInstanceKeyFromStrings(hostname string, port string) (*InstanceKey, error)

NewInstanceKeyFromStrings creates a new InstanceKey by resolving hostname and port. hostname is normalized via ResolveHostname. port is tested to be valid integer.

func NewRawInstanceKey 

func NewRawInstanceKey(hostPort string) (*InstanceKey, error)

ParseInstanceKey will parse an InstanceKey from a string representation such as 127.0.0.1:3306

func ParseInstanceKey 

func ParseInstanceKey(hostPort string) (*InstanceKey, error)

ParseInstanceKey will parse an InstanceKey from a string representation such as 127.0.0.1:3306

func ParseInstanceKeyLoose 

func ParseInstanceKeyLoose(hostPort string) (*InstanceKey, error)

ParseInstanceKeyLoose will parse an InstanceKey from a string representation such as 127.0.0.1:3306. The port part is optional

func ReadMaintenanceInstanceKey 

func ReadMaintenanceInstanceKey(maintenanceToken int64) (*InstanceKey, error)

ReadMaintenanceInstanceKey will return the instanceKey for active maintenance by maintenanceToken

func ReadOutdatedInstanceKeys 

func ReadOutdatedInstanceKeys() ([]InstanceKey, error)

ReadOutdatedInstanceKeys reads and returns keys for all instances that are not up to date (i.e. pre-configured time has passed since they were last cheked) But we also check for the case where an attempt at instance checking has been made, that hasn't resulted in an actual check! This can happen when TCP/IP connections are hung, in which case the "check" never returns. In such case we multiply interval by a factor, so as not to open too many connections on the instance.

func UnresolveHostname 

func UnresolveHostname(instanceKey *InstanceKey) (InstanceKey, bool, error)

func (*InstanceKey) DisplayString 

func (this *InstanceKey) DisplayString() string

DisplayString returns a user-friendly string representation of this key

func (*InstanceKey) Equals 

func (this *InstanceKey) Equals(other *InstanceKey) bool

Equals tests equality between this key and another key

func (*InstanceKey) Formalize 

func (this *InstanceKey) Formalize() *InstanceKey

Formalize this key by getting CNAME for hostname

func (*InstanceKey) IsValid 

func (this *InstanceKey) IsValid() bool

IsValid uses simple heuristics to see whether this key represents an actual instance

type InstanceKeyMap 

type InstanceKeyMap map[InstanceKey]bool

InstanceKeyMap is a convenience struct for listing InstanceKey-s

func (*InstanceKeyMap) GetInstanceKeys 

func (this *InstanceKeyMap) GetInstanceKeys() []InstanceKey

GetInstanceKeys returns keys in this map in the form of an array

func (*InstanceKeyMap) MarshalJSON 

func (this *InstanceKeyMap) MarshalJSON() ([]byte, error)

MarshalJSON will marshal this map as JSON

type InstancesByCountSlaveHosts 

type InstancesByCountSlaveHosts [](*Instance)

InstancesByCountSlaveHosts is a sortable type for Instance

func (InstancesByCountSlaveHosts) Len 

func (this InstancesByCountSlaveHosts) Len() int

func (InstancesByCountSlaveHosts) Less 

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

func (InstancesByCountSlaveHosts) Swap 

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

type InstancesByExecBinlogCoordinates 

type InstancesByExecBinlogCoordinates [](*Instance)

InstancesByExecBinlogCoordinates is a sortabel type for BinlogCoordinates

func (InstancesByExecBinlogCoordinates) Len 

func (this InstancesByExecBinlogCoordinates) Len() int

func (InstancesByExecBinlogCoordinates) Less 

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

func (InstancesByExecBinlogCoordinates) Swap 

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

type Maintenance 

type Maintenance struct {
	MaintenanceId  uint
	Key            InstanceKey
	BeginTimestamp string
	SecondsElapsed uint
	IsActive       bool
	Owner          string
	Reason         string
}

Maintenance indicates a maintenance entry (also in the database)

func ReadActiveMaintenance 

func ReadActiveMaintenance() ([]Maintenance, error)

ReadActiveMaintenance returns the list of currently active maintenance entries

type PoolInstancesMap 

type PoolInstancesMap map[string]([]*InstanceKey)

PoolInstancesMap lists instance keys per pool name

func ReadClusterPoolInstances 

func ReadClusterPoolInstances(clusterName string) (*PoolInstancesMap, error)

type Process 

type Process struct {
	InstanceHostname string
	InstancePort     int
	Id               int64
	User             string
	Host             string
	Db               string
	Command          string
	Time             int64
	State            string
	Info             string
	StartedAt        string
}

Process presents a MySQL executing thread (as observed by PROCESSLIST)

func ReadLongRunningProcesses 

func ReadLongRunningProcesses(filter string) ([]Process, error)

ReadLongRunningProcesses returns the list of current known long running processes of all instances

type ReplicationAnalysis 

type ReplicationAnalysis struct {
	AnalyzedInstanceKey         InstanceKey
	AnalyzedInstanceMasterKey   InstanceKey
	ClusterDetails              ClusterInfo
	IsMaster                    bool
	IsCoMaster                  bool
	LastCheckValid              bool
	CountSlaves                 uint
	CountValidSlaves            uint
	CountValidReplicatingSlaves uint
	ReplicationDepth            uint
	SlaveHosts                  InstanceKeyMap
	IsFailingToConnectToMaster  bool
	Analysis                    AnalysisCode
	Description                 string
	IsDowntimed                 bool
	DowntimeEndTimestamp        string
	DowntimeRemainingSeconds    int
	IsMaxscale                  bool
}

ReplicationAnalysis notes analysis on replication chain status, per instance

func GetReplicationAnalysis 

func GetReplicationAnalysis(includeDowntimed bool) ([]ReplicationAnalysis, error)

GetReplicationAnalysis will check for replication problems (dead master; unreachable master; etc)

func (*ReplicationAnalysis) GetSlaveHostsAsString 

func (this *ReplicationAnalysis) GetSlaveHostsAsString() string

GetSlaveHostsAsString serializes all slave keys as a single comma delimited string

func (*ReplicationAnalysis) ReadSlaveHostsFromString 

func (this *ReplicationAnalysis) ReadSlaveHostsFromString(slaveHostsString string) error

ReadSlaveHostsFromString parses and reads slave keys from comma delimited string

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