ring

package
v0.4.0 Latest Latest
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 Go to latest Published: Dec 2, 2019 License: Apache-2.0 Imports: 29 Imported by: 49

Documentation

Index

Constants

View Source 
const (

	// ConsulKey is the key under which we store the ring in consul.
	ConsulKey = "ring"
)

Variables

View Source 
var (
	ErrInvalidLengthRing = fmt.Errorf("proto: negative length found during unmarshaling")
	ErrIntOverflowRing   = fmt.Errorf("proto: integer overflow")
)
View Source 
var ErrEmptyRing = errors.New("empty ring")

ErrEmptyRing is the error returned when trying to get an element when nothing has been added to hash.

View Source 
var IngesterState_name = map[int32]string{
	0: "ACTIVE",
	1: "LEAVING",
	2: "PENDING",
	3: "JOINING",
	4: "LEFT",
}
View Source 
var IngesterState_value = map[string]int32{
	"ACTIVE":  0,
	"LEAVING": 1,
	"PENDING": 2,
	"JOINING": 3,
	"LEFT":    4,
}

Functions

func DoBatch 

func DoBatch(ctx context.Context, r ReadRing, keys []uint32, callback func(IngesterDesc, []int) error, cleanup func()) error

DoBatch request against a set of keys in the ring, handling replication and failures. For example if we want to write N items where they may all hit different ingesters, and we want them all replicated R ways with quorum writes, we track the relationship between batch RPCs and the items within them.

Callback is passed the ingester to target, and the indexes of the keys to send to that ingester.

Not implemented as a method on Ring so we can test separately.

func GenerateTokens 

func GenerateTokens(numTokens int, takenTokens []uint32) []uint32

GenerateTokens make numTokens unique random tokens, none of which clash with takenTokens.

func GetCodec 

func GetCodec() codec.Codec

GetCodec returns the codec used to encode and decode data being put by ring.

func ProtoDescFactory 

func ProtoDescFactory() proto.Message

ProtoDescFactory makes new Descs

Types

type ByToken 

type ByToken []TokenDesc

ByToken is a sortable list of TokenDescs

func (ByToken) Len 

func (ts ByToken) Len() int

func (ByToken) Less 

func (ts ByToken) Less(i, j int) bool

func (ByToken) Swap 

func (ts ByToken) Swap(i, j int)

type Config 

type Config struct {
	KVStore           kv.Config     `yaml:"kvstore,omitempty"`
	HeartbeatTimeout  time.Duration `yaml:"heartbeat_timeout,omitempty"`
	ReplicationFactor int           `yaml:"replication_factor,omitempty"`
}

Config for a Ring

func (*Config) RegisterFlags 

func (cfg *Config) RegisterFlags(f *flag.FlagSet)

RegisterFlags adds the flags required to config this to the given FlagSet with a specified prefix

func (*Config) RegisterFlagsWithPrefix 

func (cfg *Config) RegisterFlagsWithPrefix(prefix string, f *flag.FlagSet)

RegisterFlagsWithPrefix adds the flags required to config this to the given FlagSet with a specified prefix

type Desc 

type Desc struct {
	Ingesters map[string]IngesterDesc `` /* 149-byte string literal not displayed */
	Tokens    []TokenDesc             `protobuf:"bytes,2,rep,name=tokens,proto3" json:"tokens"`
}

func NewDesc 

func NewDesc() *Desc

NewDesc returns an empty ring.Desc

func (*Desc) AddIngester 

func (d *Desc) AddIngester(id, addr string, tokens []uint32, state IngesterState, normaliseTokens bool)

AddIngester adds the given ingester to the ring.

func (*Desc) ClaimTokens 

func (d *Desc) ClaimTokens(from, to string, normaliseTokens bool) []uint32

ClaimTokens transfers all the tokens from one ingester to another, returning the claimed token. This method assumes that Ring is in the correct state, 'from' ingester has no tokens anywhere, and 'to' ingester uses either normalised or non-normalised tokens, but not both. Tokens list must be sorted properly. If all of this is true, everything will be fine.

func (*Desc) Descriptor 

func (*Desc) Descriptor() ([]byte, []int)

func (*Desc) Equal 

func (this *Desc) Equal(that interface{}) bool

func (*Desc) FindIngestersByState 

func (d *Desc) FindIngestersByState(state IngesterState) []IngesterDesc

FindIngestersByState returns the list of ingesters in the given state

func (*Desc) GetIngesters 

func (m *Desc) GetIngesters() map[string]IngesterDesc

func (*Desc) GetTokens 

func (m *Desc) GetTokens() []TokenDesc

func (*Desc) GoString 

func (this *Desc) GoString() string

func (*Desc) Marshal 

func (m *Desc) Marshal() (dAtA []byte, err error)

func (*Desc) MarshalTo 

func (m *Desc) MarshalTo(dAtA []byte) (int, error)

func (*Desc) Merge added in v0.4.0 

func (d *Desc) Merge(mergeable memberlist.Mergeable, localCAS bool) (memberlist.Mergeable, error)

Merge merges other ring into this one. Returns sub-ring that represents the change, and can be sent out to other clients.

This merge function depends on the timestamp of the ingester. For each ingester, it will choose more recent state from the two rings, and put that into this ring. There is one exception: we accept LEFT state even if Timestamp hasn't changed.

localCAS flag tells the merge that it can use incoming ring as a full state, and detect missing ingesters based on it. Ingesters from incoming ring will cause ingester to be marked as LEFT and gossiped about.

If multiple ingesters end up owning the same tokens, Merge will do token conflict resolution (see resolveConflicts).

This method is part of memberlist.Mergeable interface, and is only used by gossiping ring.

func (*Desc) MergeContent added in v0.4.0 

func (d *Desc) MergeContent() []string

MergeContent describes content of this Mergeable. Ring simply returns list of ingesters that it includes.

func (*Desc) ProtoMessage 

func (*Desc) ProtoMessage()

func (*Desc) Ready 

func (d *Desc) Ready(now time.Time, heartbeatTimeout time.Duration) error

Ready returns no error when all ingesters are active and healthy.

func (*Desc) RemoveIngester 

func (d *Desc) RemoveIngester(id string)

RemoveIngester removes the given ingester and all its tokens.

func (*Desc) RemoveTombstones added in v0.4.0 

func (d *Desc) RemoveTombstones(limit time.Time)

RemoveTombstones removes LEFT ingesters older than given time limit. If time limit is zero, remove all LEFT ingesters.

func (*Desc) Reset 

func (m *Desc) Reset()

func (*Desc) Size 

func (m *Desc) Size() (n int)

func (*Desc) String 

func (this *Desc) String() string

func (*Desc) TokensFor 

func (d *Desc) TokensFor(id string) (tokens, other []uint32)

TokensFor partitions the tokens into those for the given ID, and those for others.

func (*Desc) Unmarshal 

func (m *Desc) Unmarshal(dAtA []byte) error

func (*Desc) XXX_DiscardUnknown 

func (m *Desc) XXX_DiscardUnknown()

func (*Desc) XXX_Marshal 

func (m *Desc) XXX_Marshal(b []byte, deterministic bool) ([]byte, error)

func (*Desc) XXX_Merge 

func (m *Desc) XXX_Merge(src proto.Message)

func (*Desc) XXX_Size 

func (m *Desc) XXX_Size() int

func (*Desc) XXX_Unmarshal 

func (m *Desc) XXX_Unmarshal(b []byte) error

type FlushTransferer 

type FlushTransferer interface {
	StopIncomingRequests()
	Flush()
	TransferOut(ctx context.Context) error
}

FlushTransferer controls the shutdown of an ingester.

type IngesterDesc 

type IngesterDesc struct {
	Addr      string        `protobuf:"bytes,1,opt,name=addr,proto3" json:"addr,omitempty"`
	Timestamp int64         `protobuf:"varint,2,opt,name=timestamp,proto3" json:"timestamp,omitempty"`
	State     IngesterState `protobuf:"varint,3,opt,name=state,proto3,enum=ring.IngesterState" json:"state,omitempty"`
	Tokens    []uint32      `protobuf:"varint,6,rep,packed,name=tokens,proto3" json:"tokens,omitempty"`
}

func (*IngesterDesc) Descriptor 

func (*IngesterDesc) Descriptor() ([]byte, []int)

func (*IngesterDesc) Equal 

func (this *IngesterDesc) Equal(that interface{}) bool

func (*IngesterDesc) GetAddr 

func (m *IngesterDesc) GetAddr() string

func (*IngesterDesc) GetState 

func (m *IngesterDesc) GetState() IngesterState

func (*IngesterDesc) GetTimestamp 

func (m *IngesterDesc) GetTimestamp() int64

func (*IngesterDesc) GetTokens 

func (m *IngesterDesc) GetTokens() []uint32

func (*IngesterDesc) GoString 

func (this *IngesterDesc) GoString() string

func (*IngesterDesc) IsHealthy added in v0.4.0 

func (i *IngesterDesc) IsHealthy(op Operation, heartbeatTimeout time.Duration) bool

IsHealthy checks whether the ingester appears to be alive and heartbeating

func (*IngesterDesc) Marshal 

func (m *IngesterDesc) Marshal() (dAtA []byte, err error)

func (*IngesterDesc) MarshalTo 

func (m *IngesterDesc) MarshalTo(dAtA []byte) (int, error)

func (*IngesterDesc) ProtoMessage 

func (*IngesterDesc) ProtoMessage()

func (*IngesterDesc) Reset 

func (m *IngesterDesc) Reset()

func (*IngesterDesc) Size 

func (m *IngesterDesc) Size() (n int)

func (*IngesterDesc) String 

func (this *IngesterDesc) String() string

func (*IngesterDesc) Unmarshal 

func (m *IngesterDesc) Unmarshal(dAtA []byte) error

func (*IngesterDesc) XXX_DiscardUnknown 

func (m *IngesterDesc) XXX_DiscardUnknown()

func (*IngesterDesc) XXX_Marshal 

func (m *IngesterDesc) XXX_Marshal(b []byte, deterministic bool) ([]byte, error)

func (*IngesterDesc) XXX_Merge 

func (m *IngesterDesc) XXX_Merge(src proto.Message)

func (*IngesterDesc) XXX_Size 

func (m *IngesterDesc) XXX_Size() int

func (*IngesterDesc) XXX_Unmarshal 

func (m *IngesterDesc) XXX_Unmarshal(b []byte) error

type IngesterState 

type IngesterState int32
const (
	ACTIVE  IngesterState = 0
	LEAVING IngesterState = 1
	PENDING IngesterState = 2
	JOINING IngesterState = 3
	// This state is only used by gossiping code to distribute information about
	// ingesters that have been removed from the ring. Ring users should not use it directly.
	LEFT IngesterState = 4
)

func (IngesterState) EnumDescriptor 

func (IngesterState) EnumDescriptor() ([]byte, []int)

func (IngesterState) String 

func (x IngesterState) String() string

type Lifecycler 

type Lifecycler struct {
	KVStore kv.Client

	// These values are initialised at startup, and never change
	ID       string
	Addr     string
	RingName string
	// contains filtered or unexported fields
}

Lifecycler is responsible for managing the lifecycle of entries in the ring.

func NewLifecycler 

func NewLifecycler(cfg LifecyclerConfig, flushTransferer FlushTransferer, name string) (*Lifecycler, error)

NewLifecycler makes and starts a new Lifecycler.

func (*Lifecycler) ChangeState 

func (i *Lifecycler) ChangeState(ctx context.Context, state IngesterState) error

ChangeState of the ingester, for use off of the loop() goroutine.

func (*Lifecycler) CheckReady 

func (i *Lifecycler) CheckReady(ctx context.Context) error

CheckReady is used to rate limit the number of ingesters that can be coming or going at any one time, by only returning true if all ingesters are active. The state latches: once we have gone ready we don't go un-ready

func (*Lifecycler) ClaimTokensFor 

func (i *Lifecycler) ClaimTokensFor(ctx context.Context, ingesterID string) error

ClaimTokensFor takes all the tokens for the supplied ingester and assigns them to this ingester.

For this method to work correctly (especially when using gossiping), source ingester (specified by ingesterID) must be in the LEAVING state, otherwise ring's merge function may detect token conflict and assign token to the wrong ingester. While we could check for that state here, when this method is called, transfers have already finished -- it's better to check for this *before* transfers start.

func (*Lifecycler) GetState 

func (i *Lifecycler) GetState() IngesterState

GetState returns the state of this ingester.

func (*Lifecycler) HealthyInstancesCount added in v0.4.0 

func (i *Lifecycler) HealthyInstancesCount() int

HealthyInstancesCount returns the number of healthy instances in the ring, updated during the last heartbeat period

func (*Lifecycler) Shutdown 

func (i *Lifecycler) Shutdown()

Shutdown the lifecycle. It will: - send chunks to another ingester, if it can. - otherwise, flush chunks to the chunk store. - remove config from Consul. - block until we've successfully shutdown.

func (*Lifecycler) Start added in v0.4.0 

func (i *Lifecycler) Start()

Start the lifecycler

type LifecyclerConfig 

type LifecyclerConfig struct {
	RingConfig Config `yaml:"ring,omitempty"`

	// Config for the ingester lifecycle control
	ListenPort       *int
	NumTokens        int           `yaml:"num_tokens,omitempty"`
	HeartbeatPeriod  time.Duration `yaml:"heartbeat_period,omitempty"`
	ObservePeriod    time.Duration `yaml:"observe_period,omitempty"`
	JoinAfter        time.Duration `yaml:"join_after,omitempty"`
	MinReadyDuration time.Duration `yaml:"min_ready_duration,omitempty"`
	UnusedFlag       bool          `yaml:"claim_on_rollout,omitempty"` // DEPRECATED - left for backwards-compatibility
	NormaliseTokens  bool          `yaml:"normalise_tokens,omitempty"`
	InfNames         []string      `yaml:"interface_names"`
	FinalSleep       time.Duration `yaml:"final_sleep"`

	// For testing, you can override the address and ID of this ingester
	Addr           string `yaml:"address"`
	Port           int
	ID             string
	SkipUnregister bool
}

LifecyclerConfig is the config to build a Lifecycler.

func (*LifecyclerConfig) RegisterFlags 

func (cfg *LifecyclerConfig) RegisterFlags(f *flag.FlagSet)

RegisterFlags adds the flags required to config this to the given FlagSet

func (*LifecyclerConfig) RegisterFlagsWithPrefix 

func (cfg *LifecyclerConfig) RegisterFlagsWithPrefix(prefix string, f *flag.FlagSet)

RegisterFlagsWithPrefix adds the flags required to config this to the given FlagSet.

type Operation 

type Operation int

Operation can be Read or Write 

const (
	Read Operation = iota
	Write
	Reporting // Special value for inquiring about health
)

Values for Operation

type ReadRing 

type ReadRing interface {
	prometheus.Collector

	// Get returns n (or more) ingesters which form the replicas for the given key.
	// buf is a slice to be overwritten for the return value
	// to avoid memory allocation; can be nil.
	Get(key uint32, op Operation, buf []IngesterDesc) (ReplicationSet, error)
	GetAll() (ReplicationSet, error)
	ReplicationFactor() int
	IngesterCount() int
}

ReadRing represents the read inferface to the ring.

type ReplicationSet 

type ReplicationSet struct {
	Ingesters []IngesterDesc
	MaxErrors int
}

ReplicationSet describes the ingesters to talk to for a given key, and how many errors to tolerate.

func (ReplicationSet) Do 

func (r ReplicationSet) Do(ctx context.Context, delay time.Duration, f func(*IngesterDesc) (interface{}, error)) ([]interface{}, error)

Do function f in parallel for all replicas in the set, erroring is we exceed MaxErrors and returning early otherwise.

type Ring 

type Ring struct {
	KVClient kv.Client
	// contains filtered or unexported fields
}

Ring holds the information about the members of the consistent hash ring.

func New 

func New(cfg Config, name string) (*Ring, error)

New creates a new Ring

func (*Ring) Collect 

func (r *Ring) Collect(ch chan<- prometheus.Metric)

Collect implements prometheus.Collector.

func (*Ring) Describe 

func (r *Ring) Describe(ch chan<- *prometheus.Desc)

Describe implements prometheus.Collector.

func (*Ring) Get 

func (r *Ring) Get(key uint32, op Operation, buf []IngesterDesc) (ReplicationSet, error)

Get returns n (or more) ingesters which form the replicas for the given key.

func (*Ring) GetAll 

func (r *Ring) GetAll() (ReplicationSet, error)

GetAll returns all available ingesters in the ring.

func (*Ring) IngesterCount added in v0.3.0 

func (r *Ring) IngesterCount() int

IngesterCount is number of ingesters in the ring

func (*Ring) IsHealthy 

func (r *Ring) IsHealthy(ingester *IngesterDesc, op Operation) bool

IsHealthy checks whether an ingester appears to be alive and heartbeating

func (*Ring) ReplicationFactor 

func (r *Ring) ReplicationFactor() int

ReplicationFactor of the ring.

func (*Ring) ServeHTTP 

func (r *Ring) ServeHTTP(w http.ResponseWriter, req *http.Request)

func (*Ring) Stop 

func (r *Ring) Stop()

Stop the distributor.

type TokenDesc 

type TokenDesc struct {
	Token    uint32 `protobuf:"varint,1,opt,name=token,proto3" json:"token,omitempty"`
	Ingester string `protobuf:"bytes,2,opt,name=ingester,proto3" json:"ingester,omitempty"`
}

func (*TokenDesc) Descriptor 

func (*TokenDesc) Descriptor() ([]byte, []int)

func (*TokenDesc) Equal 

func (this *TokenDesc) Equal(that interface{}) bool

func (*TokenDesc) GetIngester 

func (m *TokenDesc) GetIngester() string

func (*TokenDesc) GetToken 

func (m *TokenDesc) GetToken() uint32

func (*TokenDesc) GoString 

func (this *TokenDesc) GoString() string

func (*TokenDesc) Marshal 

func (m *TokenDesc) Marshal() (dAtA []byte, err error)

func (*TokenDesc) MarshalTo 

func (m *TokenDesc) MarshalTo(dAtA []byte) (int, error)

func (*TokenDesc) ProtoMessage 

func (*TokenDesc) ProtoMessage()

func (*TokenDesc) Reset 

func (m *TokenDesc) Reset()

func (*TokenDesc) Size 

func (m *TokenDesc) Size() (n int)

func (*TokenDesc) String 

func (this *TokenDesc) String() string

func (*TokenDesc) Unmarshal 

func (m *TokenDesc) Unmarshal(dAtA []byte) error

func (*TokenDesc) XXX_DiscardUnknown 

func (m *TokenDesc) XXX_DiscardUnknown()

func (*TokenDesc) XXX_Marshal 

func (m *TokenDesc) XXX_Marshal(b []byte, deterministic bool) ([]byte, error)

func (*TokenDesc) XXX_Merge 

func (m *TokenDesc) XXX_Merge(src proto.Message)

func (*TokenDesc) XXX_Size 

func (m *TokenDesc) XXX_Size() int

func (*TokenDesc) XXX_Unmarshal 

func (m *TokenDesc) XXX_Unmarshal(b []byte) error

Source Files

View all Source files

Directories

Path Synopsis
kv
codec
consul
etcd
memberlist

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