cluster

package
v0.8.5 Latest Latest
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 Go to latest Published: Oct 27, 2014 License: MIT Imports: 25 Imported by: 0

Documentation

Index

Constants

View Source 
const (
	PER_SERVER_BUFFER_SIZE  = 10
	LOCAL_WRITE_BUFFER_SIZE = 10
)
View Source 
const (
	SEVEN_DAYS                        = time.Hour * 24 * 7
	DEFAULT_SPLIT                     = 1
	DEFAULT_REPLICATION_FACTOR        = 1
	DEFAULT_SHARD_DURATION            = SEVEN_DAYS
	DEFAULT_RETENTION_POLICY_DURATION = 0
)
View Source 
const (
	DEFAULT_SHARD_SPACE_NAME = "default"
)
View Source 
const (
	HEARTBEAT_TIMEOUT = 100 * time.Millisecond
)

Variables

View Source 
var HEARTBEAT_TYPE = protocol.Request_HEARTBEAT

Functions

func HashDbAndSeriesToInt 

func HashDbAndSeriesToInt(database, series string) int

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) GetReadPermission 

func (self *ClusterAdmin) GetReadPermission() string

func (*ClusterAdmin) GetWritePermission 

func (self *ClusterAdmin) GetWritePermission() string

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

func (*ClusterAdmin) IsDbAdmin 

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

type ClusterConfiguration 

type ClusterConfiguration struct {
	DatabaseReplicationFactors map[string]struct{}

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

	LocalServer *ClusterServer

	LocalRaftName string

	MetaStore *metastore.Store
	// 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,
	metaStore *metastore.Store) *ClusterConfiguration

func (*ClusterConfiguration) AddPotentialServer 

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

func (*ClusterConfiguration) AddShardSpace 

func (self *ClusterConfiguration) AddShardSpace(space *ShardSpace) error

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) ChangeDbUserPermissions 

func (self *ClusterConfiguration) ChangeDbUserPermissions(db, username, readPermissions, writePermissions string) error

func (*ClusterConfiguration) ChangeProtobufConnectionString 

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

func (*ClusterConfiguration) CreateCheckpoint 

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) error

func (*ClusterConfiguration) DatabaseExists 

func (self *ClusterConfiguration) DatabaseExists(name string) bool

func (*ClusterConfiguration) DatabasesExists 

func (self *ClusterConfiguration) DatabasesExists(db string) bool

func (*ClusterConfiguration) DeleteContinuousQuery 

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

func (*ClusterConfiguration) DropDatabase 

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

func (*ClusterConfiguration) DropSeries 

func (self *ClusterConfiguration) DropSeries(database, series string) error

func (*ClusterConfiguration) DropShard 

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

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) GetExpiredShards 

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

func (*ClusterConfiguration) GetLocalConfiguration 

func (self *ClusterConfiguration) GetLocalConfiguration() *configuration.Configuration

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) 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) GetShard 

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

func (*ClusterConfiguration) GetShardSpaces 

func (self *ClusterConfiguration) GetShardSpaces() []*ShardSpace

func (*ClusterConfiguration) GetShardSpacesForDatabase added in v0.8.4 

func (self *ClusterConfiguration) GetShardSpacesForDatabase(database string) []*ShardSpace

func (*ClusterConfiguration) GetShardToWriteToBySeriesAndTime 

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

func (*ClusterConfiguration) GetShards 

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

func (*ClusterConfiguration) GetShardsForQuery 

func (self *ClusterConfiguration) GetShardsForQuery(querySpec *parser.QuerySpec) (Shards, error)

func (*ClusterConfiguration) HasContinuousQueries 

func (self *ClusterConfiguration) HasContinuousQueries() bool

func (*ClusterConfiguration) HasUncommitedWrites 

func (self *ClusterConfiguration) HasUncommitedWrites() bool

Return per shard request numbers for the local server and all remote servers

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) RemoveServer 

func (self *ClusterConfiguration) RemoveServer(server *ClusterServer) error

func (*ClusterConfiguration) RemoveShardSpace 

func (self *ClusterConfiguration) RemoveShardSpace(database, name string) 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) SerializableConfiguration added in v0.8.3 

func (self *ClusterConfiguration) SerializableConfiguration() *SavedConfiguration

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) ShardSpaceExists added in v0.8.2 

func (self *ClusterConfiguration) ShardSpaceExists(space *ShardSpace) bool

func (*ClusterConfiguration) UpdateShardSpace added in v0.8.2 

func (self *ClusterConfiguration) UpdateShardSpace(space *ShardSpace) error

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
	MinBackoff        time.Duration
	MaxBackoff        time.Duration
	// contains filtered or unexported fields
}

func NewClusterServer 

func NewClusterServer(raftName, raftConnectionString, protobufConnectionString string, connection ServerConnection, config *c.Configuration) *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) GetStateName 

func (self *ClusterServer) GetStateName() (stateName string)

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"`
}

type DbUser 

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

func (*DbUser) ChangePermissions 

func (self *DbUser) ChangePermissions(readPermissions, writePermissions string)

func (*DbUser) GetDb 

func (self *DbUser) GetDb() string

func (*DbUser) GetReadPermission 

func (self *DbUser) GetReadPermission() string

func (*DbUser) GetWritePermission 

func (self *DbUser) GetWritePermission() 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, engine.Processor) error
	DropFields(fields []*metastore.Field) 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)
}

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"`
	SpaceName string
	Database  string
	StartTime time.Time
	EndTime   time.Time
	ServerIds []uint32
}

type NilProcessor added in v0.8.4 

type NilProcessor struct{}

func (NilProcessor) Close added in v0.8.4 

func (np NilProcessor) Close() error

func (NilProcessor) Name added in v0.8.4 

func (np NilProcessor) Name() string

func (NilProcessor) Yield added in v0.8.4 

func (np NilProcessor) Yield(s *protocol.Series) (bool, error)

type QuerySpec 

type QuerySpec interface {
	GetStartTime() time.Time
	GetEndTime() time.Time
	Database() string
	TableNames() []string
	TableNamesAndRegex() ([]string, *regexp.Regexp)
	GetGroupByInterval() *time.Duration
	AllShardsQuery() bool
	IsRegex() bool
}

defined by cluster config (in cluster package)

type ResponseChannel added in v0.8.4 

type ResponseChannel interface {
	Yield(r *protocol.Response) bool
	Name() string
}

ResponseChannel is a processor for Responses as opposed to Series like `engine.Processor'

func NewResponseChannelWrapper added in v0.8.4 

func NewResponseChannelWrapper(c chan<- *protocol.Response) ResponseChannel

type ResponseChannelProcessor added in v0.8.4 

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

ResponseChannelProcessor converts Series to Responses. This is used to chain `engine.Processor` with a `ResponseChannel'

func NewResponseChannelProcessor added in v0.8.4 

func NewResponseChannelProcessor(r ResponseChannel) *ResponseChannelProcessor

func (*ResponseChannelProcessor) Close added in v0.8.4 

func (p *ResponseChannelProcessor) Close() error

func (*ResponseChannelProcessor) Name added in v0.8.4 

func (p *ResponseChannelProcessor) Name() string

func (*ResponseChannelProcessor) Yield added in v0.8.4 

func (p *ResponseChannelProcessor) Yield(s *protocol.Series) (bool, error)

type ResponseChannelWrapper added in v0.8.4 

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

A `ResponseProcessor' that wraps a go channel.

func (*ResponseChannelWrapper) Name added in v0.8.4 

func (w *ResponseChannelWrapper) Name() string

func (*ResponseChannelWrapper) Yield added in v0.8.4 

func (w *ResponseChannelWrapper) Yield(r *protocol.Response) bool

type SavedConfiguration 

type SavedConfiguration struct {
	Databases           map[string]uint8
	Admins              map[string]*ClusterAdmin
	DbUsers             map[string]map[string]*DbUser
	Servers             []*ClusterServer
	ContinuousQueries   map[string][]*ContinuousQuery
	MetaStore           *metastore.Store
	LastShardIdUsed     uint32
	LastServerIdUsed    uint32
	DatabaseShardSpaces map[string][]*ShardSpace
	Shards              []*NewShardData
}

type ServerConnection 

type ServerConnection interface {
	Connect()
	Close()
	ClearRequests()
	MakeRequest(*protocol.Request, ResponseChannel) error
	CancelRequest(*protocol.Request)
}

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
	SyncWrite(req *p.Request, assignSeqNum bool) error
	Query(querySpec *parser.QuerySpec, response chan<- *p.Response)
	ReplicationFactor() int
	IsMicrosecondInRange(t int64) bool
}

A shard implements an interface for writing and querying data. It can be copied to multiple servers or the local datastore. Shards 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)
	CreateShardSpace(shardSpace *ShardSpace) error
}

type ShardData 

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

func NewShard 

func NewShard(id uint32, startTime, endTime time.Time, database, spaceName string, wal WAL) *ShardData

func (*ShardData) DropFields 

func (self *ShardData) DropFields(fields []*metastore.Field) error

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) QueryResponseBufferSize 

func (self *ShardData) QueryResponseBufferSize(querySpec *parser.QuerySpec, batchPointSize int) int

func (*ShardData) ReplicationFactor 

func (self *ShardData) ReplicationFactor() int

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

Returns true if we can aggregate the data locally per shard, i.e. the group by interval lines up with the shard duration and there are no joins or merges

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) SyncWrite 

func (self *ShardData) SyncWrite(request *p.Request, assignSeqNum bool) error

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 ShardIdInserterProcessor added in v0.8.4 

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

A processor to set the ShardId on the series to `id`

func NewShardIdInserterProcessor added in v0.8.4 

func NewShardIdInserterProcessor(id uint32, next engine.Processor) ShardIdInserterProcessor

func (ShardIdInserterProcessor) Close added in v0.8.4 

func (sip ShardIdInserterProcessor) Close() error

func (ShardIdInserterProcessor) Name added in v0.8.4 

func (sip ShardIdInserterProcessor) Name() string

func (ShardIdInserterProcessor) Yield added in v0.8.4 

func (sip ShardIdInserterProcessor) Yield(s *protocol.Series) (bool, error)

type ShardSpace 

type ShardSpace struct {
	// required, must be unique within the database
	Name string `json:"name"`
	// required, a database has many shard spaces and a shard space belongs to a database
	Database string `json:"database"`
	// this is optional, if they don't set it, we'll set to /.*/
	Regex string `json:"regex"`

	// this is optional, if they don't set it, it will default to the storage.dir in the config
	RetentionPolicy   string `json:"retentionPolicy"`
	ShardDuration     string `json:"shardDuration"`
	ReplicationFactor uint32 `json:"replicationFactor"`
	Split             uint32 `json:"split"`
	// contains filtered or unexported fields
}

func NewShardSpace 

func NewShardSpace(database, name string) *ShardSpace

func (*ShardSpace) MatchesSeries 

func (s *ShardSpace) MatchesSeries(name string) bool

func (*ShardSpace) ParsedRetentionPeriod 

func (s *ShardSpace) ParsedRetentionPeriod() time.Duration

func (*ShardSpace) ParsedShardDuration 

func (s *ShardSpace) ParsedShardDuration() time.Duration

func (*ShardSpace) SecondsOfDuration 

func (s *ShardSpace) SecondsOfDuration() float64

func (*ShardSpace) SetDefaults 

func (s *ShardSpace) SetDefaults()

func (*ShardSpace) UpdateFromSpace added in v0.8.2 

func (s *ShardSpace) UpdateFromSpace(space *ShardSpace) error

func (*ShardSpace) Validate 

func (s *ShardSpace) Validate(clusterConfig *ClusterConfiguration, checkForDb bool) error

type ShardType 

type ShardType int
const (
	LONG_TERM ShardType = iota
	SHORT_TERM
)

type Shards added in v0.8.4 

type Shards []*ShardData

func (Shards) ShouldAggregateLocally added in v0.8.4 

func (shards Shards) ShouldAggregateLocally(querySpec *parser.QuerySpec) bool

Return true iff we can aggregate locally on all the given shards, false otherwise

type WAL 

type WAL interface {
	AssignSequenceNumbersAndLog(request *protocol.Request, shard wal.Shard) (uint32, error)
	AssignSequenceNumbers(request *protocol.Request) 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) HasUncommitedWrites 

func (self *WriteBuffer) HasUncommitedWrites() bool

func (*WriteBuffer) ShardsRequestNumber 

func (self *WriteBuffer) ShardsRequestNumber() map[uint32]uint32

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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