cluster

package
v0.5.2 Latest Latest
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 Go to latest Published: Mar 28, 2014 License: MIT Imports: 23 Imported by: 0

Documentation

Index

Constants

View Source 
const (
	DEFAULT_BACKOFF   = time.Second
	MAX_BACKOFF       = 10 * time.Second
	HEARTBEAT_TIMEOUT = 100 * time.Millisecond
)
View Source 
const (
	PER_SERVER_BUFFER_SIZE  = 10
	LOCAL_WRITE_BUFFER_SIZE = 10
)
View Source 
const (
	FIRST_LOWER_CASE_CHARACTER = uint8('a')
)

Variables

View Source 
var HEARTBEAT_TYPE = protocol.Request_HEARTBEAT

Functions

func HashPassword 

func HashPassword(password string) ([]byte, error)

func SortShardsByTimeAscending 

func SortShardsByTimeAscending(shards []*ShardData)

func SortShardsByTimeDescending 

func SortShardsByTimeDescending(shards []*ShardData)

Types

type ByShardTimeAsc 

type ByShardTimeAsc struct{ ShardCollection }

func (ByShardTimeAsc) Less 

func (s ByShardTimeAsc) Less(i, j int) bool

type ByShardTimeDesc 

type ByShardTimeDesc struct{ ShardCollection }

func (ByShardTimeDesc) Less 

func (s ByShardTimeDesc) Less(i, j int) bool

type ClusterAdmin 

type ClusterAdmin struct {
	CommonUser `json:"common"`
}

func (*ClusterAdmin) HasReadAccess 

func (self *ClusterAdmin) HasReadAccess(_ string) bool

func (*ClusterAdmin) HasWriteAccess 

func (self *ClusterAdmin) HasWriteAccess(_ string) bool

func (*ClusterAdmin) IsClusterAdmin 

func (self *ClusterAdmin) IsClusterAdmin() bool

type ClusterConfiguration 

type ClusterConfiguration struct {
	DatabaseReplicationFactors map[string]uint8

	ParsedContinuousQueries map[string]map[uint32]*parser.SelectQuery

	LocalServerId uint32

	LocalRaftName string
	// contains filtered or unexported fields
}

This struct stores all the metadata confiugration information about a running cluster. This includes the servers in the cluster and their state, databases, users, and which continuous queries are running.

func NewClusterConfiguration 

func NewClusterConfiguration(
	config *configuration.Configuration,
	wal WAL,
	shardStore LocalShardStore,
	connectionCreator func(string) ServerConnection) *ClusterConfiguration

func (*ClusterConfiguration) AddPotentialServer 

func (self *ClusterConfiguration) AddPotentialServer(server *ClusterServer)

func (*ClusterConfiguration) AddShards 

func (self *ClusterConfiguration) AddShards(shards []*NewShardData) ([]*ShardData, error)

Add shards expects all shards to be of the same type (long term or short term) and have the same start and end times. This is called to add the shard set for a given duration. If existing shards have the same times, those are returned.

func (*ClusterConfiguration) AuthenticateClusterAdmin 

func (self *ClusterConfiguration) AuthenticateClusterAdmin(username, password string) (common.User, error)

func (*ClusterConfiguration) AuthenticateDbUser 

func (self *ClusterConfiguration) AuthenticateDbUser(db, username, password string) (common.User, error)

func (*ClusterConfiguration) ChangeDbUserPassword 

func (self *ClusterConfiguration) ChangeDbUserPassword(db, username, hash string) error

func (*ClusterConfiguration) CreateCheckpoint added in v0.5.2 

func (self *ClusterConfiguration) CreateCheckpoint() error

func (*ClusterConfiguration) CreateContinuousQuery 

func (self *ClusterConfiguration) CreateContinuousQuery(db string, query string) error

func (*ClusterConfiguration) CreateDatabase 

func (self *ClusterConfiguration) CreateDatabase(name string, replicationFactor uint8) error

func (*ClusterConfiguration) CreateFutureShardsAutomaticallyBeforeTimeComes 

func (self *ClusterConfiguration) CreateFutureShardsAutomaticallyBeforeTimeComes()

called by the server, this will wake up every 10 mintues to see if it should create a shard for the next window of time. This way shards get created before a bunch of writes stream in and try to create it all at the same time.

func (*ClusterConfiguration) DeleteContinuousQuery 

func (self *ClusterConfiguration) DeleteContinuousQuery(db string, id uint32) error

func (*ClusterConfiguration) DropDatabase 

func (self *ClusterConfiguration) DropDatabase(name string) error

func (*ClusterConfiguration) DropShard 

func (self *ClusterConfiguration) DropShard(shardId uint32, serverIds []uint32) error

func (*ClusterConfiguration) GetAllShards 

func (self *ClusterConfiguration) GetAllShards() []*ShardData

func (*ClusterConfiguration) GetClusterAdmin 

func (self *ClusterConfiguration) GetClusterAdmin(username string) *ClusterAdmin

func (*ClusterConfiguration) GetClusterAdmins 

func (self *ClusterConfiguration) GetClusterAdmins() (names []string)

func (*ClusterConfiguration) GetContinuousQueries 

func (self *ClusterConfiguration) GetContinuousQueries(db string) []*ContinuousQuery

func (*ClusterConfiguration) GetDatabases 

func (self *ClusterConfiguration) GetDatabases() []*Database

func (*ClusterConfiguration) GetDbUser 

func (self *ClusterConfiguration) GetDbUser(db, username string) *DbUser

func (*ClusterConfiguration) GetDbUsers 

func (self *ClusterConfiguration) GetDbUsers(db string) []common.User

func (*ClusterConfiguration) GetLocalShardById 

func (self *ClusterConfiguration) GetLocalShardById(id uint32) *ShardData

This function is for the request handler to get the shard to write a request to locally.

func (*ClusterConfiguration) GetLongTermShards 

func (self *ClusterConfiguration) GetLongTermShards() []*ShardData

func (*ClusterConfiguration) GetMapForJsonSerialization 

func (self *ClusterConfiguration) GetMapForJsonSerialization() map[string]interface{}

func (*ClusterConfiguration) GetServerById 

func (self *ClusterConfiguration) GetServerById(id *uint32) *ClusterServer

func (*ClusterConfiguration) GetServerByProtobufConnectionString 

func (self *ClusterConfiguration) GetServerByProtobufConnectionString(connectionString string) *ClusterServer

func (*ClusterConfiguration) GetServerByRaftName 

func (self *ClusterConfiguration) GetServerByRaftName(name string) *ClusterServer

func (*ClusterConfiguration) GetShardToWriteToBySeriesAndTime 

func (self *ClusterConfiguration) GetShardToWriteToBySeriesAndTime(db, series string, microsecondsEpoch int64) (*ShardData, error)

func (*ClusterConfiguration) GetShards 

func (self *ClusterConfiguration) GetShards(querySpec *parser.QuerySpec) []*ShardData

func (*ClusterConfiguration) GetShortTermShards 

func (self *ClusterConfiguration) GetShortTermShards() []*ShardData

func (*ClusterConfiguration) HasContinuousQueries 

func (self *ClusterConfiguration) HasContinuousQueries() bool

func (*ClusterConfiguration) HashDbAndSeriesToInt 

func (self *ClusterConfiguration) HashDbAndSeriesToInt(database, series string) int

func (*ClusterConfiguration) IsSingleServer 

func (self *ClusterConfiguration) IsSingleServer() bool

func (*ClusterConfiguration) LastContinuousQueryRunTime 

func (self *ClusterConfiguration) LastContinuousQueryRunTime() time.Time

func (*ClusterConfiguration) MarshalNewShardArrayToShards 

func (self *ClusterConfiguration) MarshalNewShardArrayToShards(newShards []*NewShardData) ([]*ShardData, error)

func (*ClusterConfiguration) RecoverFromWAL 

func (self *ClusterConfiguration) RecoverFromWAL() error

func (*ClusterConfiguration) Recovery 

func (self *ClusterConfiguration) Recovery(b []byte) error

func (*ClusterConfiguration) Save 

func (self *ClusterConfiguration) Save() ([]byte, error)

func (*ClusterConfiguration) SaveClusterAdmin 

func (self *ClusterConfiguration) SaveClusterAdmin(u *ClusterAdmin)

func (*ClusterConfiguration) SaveDbUser 

func (self *ClusterConfiguration) SaveDbUser(u *DbUser)

func (*ClusterConfiguration) ServerId 

func (self *ClusterConfiguration) ServerId() uint32

func (*ClusterConfiguration) Servers 

func (self *ClusterConfiguration) Servers() []*ClusterServer

func (*ClusterConfiguration) SetContinuousQueryTimestamp 

func (self *ClusterConfiguration) SetContinuousQueryTimestamp(timestamp time.Time) error

func (*ClusterConfiguration) SetLastContinuousQueryRunTime 

func (self *ClusterConfiguration) SetLastContinuousQueryRunTime(t time.Time)

func (*ClusterConfiguration) SetShardCreator 

func (self *ClusterConfiguration) SetShardCreator(shardCreator ShardCreator)

func (*ClusterConfiguration) WaitForLocalServerLoaded 

func (self *ClusterConfiguration) WaitForLocalServerLoaded()

This function will wait until the configuration has received an addPotentialServer command for this local server.

type ClusterServer 

type ClusterServer struct {
	Id                       uint32
	RaftName                 string
	State                    ServerState
	RaftConnectionString     string
	ProtobufConnectionString string

	HeartbeatInterval time.Duration
	Backoff           time.Duration
	// contains filtered or unexported fields
}

func NewClusterServer 

func NewClusterServer(raftName, raftConnectionString, protobufConnectionString string, connection ServerConnection, heartbeatInterval time.Duration) *ClusterServer

func (*ClusterServer) BufferWrite 

func (self *ClusterServer) BufferWrite(request *protocol.Request)

func (*ClusterServer) Connect 

func (self *ClusterServer) Connect()

func (*ClusterServer) GetId 

func (self *ClusterServer) GetId() uint32

func (*ClusterServer) IsUp 

func (self *ClusterServer) IsUp() bool

func (*ClusterServer) MakeRequest 

func (self *ClusterServer) MakeRequest(request *protocol.Request, responseStream chan *protocol.Response)

func (*ClusterServer) SetWriteBuffer 

func (self *ClusterServer) SetWriteBuffer(writeBuffer *WriteBuffer)

func (*ClusterServer) StartHeartbeat 

func (self *ClusterServer) StartHeartbeat()

func (*ClusterServer) Write 

func (self *ClusterServer) Write(request *protocol.Request) error

type CommonUser 

type CommonUser struct {
	Name          string `json:"name"`
	Hash          string `json:"hash"`
	IsUserDeleted bool   `json:"is_deleted"`
	CacheKey      string `json:"cache_key"`
}

func (*CommonUser) ChangePassword 

func (self *CommonUser) ChangePassword(hash string) error

func (*CommonUser) GetDb 

func (self *CommonUser) GetDb() string

func (*CommonUser) GetName 

func (self *CommonUser) GetName() string

func (*CommonUser) HasReadAccess 

func (self *CommonUser) HasReadAccess(name string) bool

func (*CommonUser) HasWriteAccess 

func (self *CommonUser) HasWriteAccess(name string) bool

func (*CommonUser) IsClusterAdmin 

func (self *CommonUser) IsClusterAdmin() bool

func (*CommonUser) IsDbAdmin 

func (self *CommonUser) IsDbAdmin(db string) bool

func (*CommonUser) IsDeleted 

func (self *CommonUser) IsDeleted() bool

type ContinuousQuery 

type ContinuousQuery struct {
	Id    uint32
	Query string
}

type Database 

type Database struct {
	Name              string `json:"name"`
	ReplicationFactor uint8  `json:"replicationFactor"`
}

type DbUser 

type DbUser struct {
	CommonUser `json:"common"`
	Db         string     `json:"db"`
	WriteTo    []*Matcher `json:"write_matchers"`
	ReadFrom   []*Matcher `json:"read_matchers"`
	IsAdmin    bool       `json:"is_admin"`
}

func (*DbUser) GetDb 

func (self *DbUser) GetDb() string

func (*DbUser) HasReadAccess 

func (self *DbUser) HasReadAccess(name string) bool

func (*DbUser) HasWriteAccess 

func (self *DbUser) HasWriteAccess(name string) bool

func (*DbUser) IsDbAdmin 

func (self *DbUser) IsDbAdmin(db string) bool

type LocalShardDb 

type LocalShardDb interface {
	Write(database string, series *p.Series) error
	Query(*parser.QuerySpec, QueryProcessor) error
	DropDatabase(database string) error
	IsClosed() bool
}

type LocalShardStore 

type LocalShardStore interface {
	Write(request *p.Request) error
	SetWriteBuffer(writeBuffer *WriteBuffer)
	BufferWrite(request *p.Request)
	GetOrCreateShard(id uint32) (LocalShardDb, error)
	ReturnShard(id uint32)
	DeleteShard(shardId uint32) error
}

type Matcher 

type Matcher struct {
	IsRegex bool
	Name    string
}

func (*Matcher) Matches 

func (self *Matcher) Matches(name string) bool

type NewShardData 

type NewShardData struct {
	Id            uint32 `json:",omitempty"`
	StartTime     time.Time
	EndTime       time.Time
	ServerIds     []uint32
	Type          ShardType
	DurationSplit bool `json:",omitempty"`
}

type QueryProcessor 

type QueryProcessor interface {
	// This method returns true if the query should continue. If the query should be stopped,
	// like maybe the limit was hit, it should return false
	YieldPoint(seriesName *string, columnNames []string, point *p.Point) bool
	YieldSeries(seriesIncoming *p.Series) bool
	Close()

	// Set by the shard, so EXPLAIN query can know query against which shard is being measured
	SetShardInfo(shardId int, shardLocal bool)

	// Let QueryProcessor identify itself. What if it is a spy and we can't check that?
	GetName() string
}

Passed to a shard (local datastore or whatever) that gets yielded points from series.

type QuerySpec 

type QuerySpec interface {
	GetStartTime() time.Time
	GetEndTime() time.Time
	Database() string
	TableNames() []string
	GetGroupByInterval() *time.Duration
	IsRegex() bool
	ShouldQueryShortTermAndLongTerm() (shouldQueryShortTerm bool, shouldQueryLongTerm bool)
}

defined by cluster config (in cluster package)

type SavedConfiguration 

type SavedConfiguration struct {
	Databases         map[string]uint8
	Admins            map[string]*ClusterAdmin
	DbUsers           map[string]map[string]*DbUser
	Servers           []*ClusterServer
	ShortTermShards   []*NewShardData
	LongTermShards    []*NewShardData
	ContinuousQueries map[string][]*ContinuousQuery
}

type ServerConnection 

type ServerConnection interface {
	Connect()
	MakeRequest(request *protocol.Request, responseStream chan *protocol.Response) error
}

type ServerState 

type ServerState int
const (
	LoadingRingData ServerState = iota
	SendingRingData
	DeletingOldData
	Running
	Potential
)

type Shard 

type Shard interface {
	Id() uint32
	StartTime() time.Time
	EndTime() time.Time
	Write(*p.Request) error
	Query(querySpec *parser.QuerySpec, response chan *p.Response)
	IsMicrosecondInRange(t int64) bool
}

A shard imements an interface for writing and querying data. It can be copied to multiple servers or the local datastore. Shard contains data from [startTime, endTime) Ids are unique across the cluster

type ShardCollection 

type ShardCollection []*ShardData

func (ShardCollection) Len 

func (s ShardCollection) Len() int

func (ShardCollection) Swap 

func (s ShardCollection) Swap(i, j int)

type ShardCreator 

type ShardCreator interface {
	// the shard creator expects all shards to be of the same type (long term or short term) and have the same
	// start and end times. This is called to create the shard set for a given duration.
	CreateShards(shards []*NewShardData) ([]*ShardData, error)
}

type ShardData 

type ShardData struct {
	IsLocal bool
	// contains filtered or unexported fields
}

func NewShard 

func NewShard(id uint32, startTime, endTime time.Time, shardType ShardType, durationIsSplit bool, wal WAL) *ShardData

func (*ShardData) DropDatabase 

func (self *ShardData) DropDatabase(database string, sendToServers bool)

func (*ShardData) EndMicro 

func (self *ShardData) EndMicro() int64

func (*ShardData) EndTime 

func (self *ShardData) EndTime() time.Time

func (*ShardData) HandleDestructiveQuery 

func (self *ShardData) HandleDestructiveQuery(querySpec *parser.QuerySpec, request *p.Request, response chan *p.Response, runLocalOnly bool)

func (*ShardData) Id 

func (self *ShardData) Id() uint32

func (*ShardData) IsMicrosecondInRange 

func (self *ShardData) IsMicrosecondInRange(t int64) bool

func (*ShardData) LogAndHandleDestructiveQuery 

func (self *ShardData) LogAndHandleDestructiveQuery(querySpec *parser.QuerySpec, request *p.Request, response chan *p.Response, runLocalOnly bool)

func (*ShardData) Query 

func (self *ShardData) Query(querySpec *parser.QuerySpec, response chan *p.Response)

func (*ShardData) ServerIds 

func (self *ShardData) ServerIds() []uint32

func (*ShardData) SetLocalStore 

func (self *ShardData) SetLocalStore(store LocalShardStore, localServerId uint32) error

func (*ShardData) SetServers 

func (self *ShardData) SetServers(servers []*ClusterServer)

func (*ShardData) ShouldAggregateLocally 

func (self *ShardData) ShouldAggregateLocally(querySpec *parser.QuerySpec) bool

func (*ShardData) StartMicro 

func (self *ShardData) StartMicro() int64

func (*ShardData) StartTime 

func (self *ShardData) StartTime() time.Time

func (*ShardData) String 

func (self *ShardData) String() string

func (*ShardData) ToNewShardData 

func (self *ShardData) ToNewShardData() *NewShardData

used to serialize shards when sending around in raft or when snapshotting in the log

func (*ShardData) Write 

func (self *ShardData) Write(request *p.Request) error

func (*ShardData) WriteLocalOnly 

func (self *ShardData) WriteLocalOnly(request *p.Request) error

type ShardType 

type ShardType int
const (
	LONG_TERM ShardType = iota
	SHORT_TERM
)

type WAL 

type WAL interface {
	AssignSequenceNumbersAndLog(request *protocol.Request, shard wal.Shard) (uint32, error)
	Commit(requestNumber uint32, serverId uint32) error
	CreateCheckpoint() error
	RecoverServerFromRequestNumber(requestNumber uint32, shardIds []uint32, yield func(request *protocol.Request, shardId uint32) error) error
	RecoverServerFromLastCommit(serverId uint32, shardIds []uint32, yield func(request *protocol.Request, shardId uint32) error) error
}

type WriteBuffer 

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

Acts as a buffer for writes

func NewWriteBuffer 

func NewWriteBuffer(writerInfo string, writer Writer, wal WAL, serverId uint32, bufferSize int) *WriteBuffer

func (*WriteBuffer) Write 

func (self *WriteBuffer) Write(request *protocol.Request)

This method never blocks. It'll buffer writes until they fill the buffer then drop the on the floor and let the background goroutine replay from the WAL

type Writer 

type Writer interface {
	Write(request *protocol.Request) error
}

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