tikv

package
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 Go to latest Published: Mar 22, 2018 License: Apache-2.0 Imports: 47 Imported by: 0

Documentation

Overview

Package tikv provides tcp connection to kvserver.

Index

Constants

View Source 
const (
	// NoJitter makes the backoff sequence strict exponential.
	NoJitter = 1 + iota
	// FullJitter applies random factors to strict exponential.
	FullJitter
	// EqualJitter is also randomized, but prevents very short sleeps.
	EqualJitter
	// DecorrJitter increases the maximum jitter based on the last random value.
	DecorrJitter
)
View Source 
const (
	BoTxnLock backoffType

	BoRegionMiss
	BoUpdateLeader
)

Back off types.

View Source 
const (
	GcOneRegionMaxBackoff   = 20000
	GcResolveLockMaxBackoff = 100000
	GcDeleteRangeMaxBackoff = 100000
)

Maximum total sleep time(in ms) for kv/cop commands.

View Source 
const (
	ReadTimeoutMedium = 60 * time.Second  // For requests that may need scan region.
	ReadTimeoutLong   = 150 * time.Second // For requests that may need scan region multiple times.
	GCTimeout         = 5 * time.Minute
)

Timeout durations.

View Source 
const (
	// This is almost the same as 'tikv_gc_safe_point' in the table 'mysql.tidb',
	// save this to pd instead of tikv, because we can't use interface of table
	// if the safepoint on tidb is expired.
	GcSavedSafePoint = "/tidb/store/gcworker/saved_safe_point"

	GcSafePointCacheInterval = time.Second * 100
)

Safe point constants.

View Source 
const ResolvedCacheSize = 2048

ResolvedCacheSize is max number of cached txn status.

Variables

View Source 
var (
	ErrTiKVServerTimeout  = terror.ClassTiKV.New(mysql.ErrTiKVServerTimeout, mysql.MySQLErrName[mysql.ErrTiKVServerTimeout]+txnRetryableMark)
	ErrResolveLockTimeout = terror.ClassTiKV.New(mysql.ErrResolveLockTimeout, mysql.MySQLErrName[mysql.ErrResolveLockTimeout]+txnRetryableMark)
	ErrPDServerTimeout    = terror.ClassTiKV.New(mysql.ErrPDServerTimeout, mysql.MySQLErrName[mysql.ErrPDServerTimeout]+"%v")
	ErrRegionUnavailable  = terror.ClassTiKV.New(mysql.ErrRegionUnavailable, mysql.MySQLErrName[mysql.ErrRegionUnavailable]+txnRetryableMark)
	ErrTiKVServerBusy     = terror.ClassTiKV.New(mysql.ErrTiKVServerBusy, mysql.MySQLErrName[mysql.ErrTiKVServerBusy]+txnRetryableMark)
	ErrGCTooEarly         = terror.ClassTiKV.New(mysql.ErrGCTooEarly, mysql.MySQLErrName[mysql.ErrGCTooEarly])
)

MySQL error instances.

View Source 
var (
	// MaxRawKVScanLimit is the maximum scan limit for rawkv Scan.
	MaxRawKVScanLimit = 10240
	// ErrMaxScanLimitExceeded is returned when the limit for rawkv Scan is to large.
	ErrMaxScanLimitExceeded = errors.New("limit should be less than MaxRawKVScanLimit")
)
View Source 
var CommitMaxBackoff = 41000

CommitMaxBackoff is max sleep time of the 'commit' command

View Source 
var (
	// ErrBodyMissing response body is missing error
	ErrBodyMissing = errors.New("response body is missing")
)
View Source 
var MaxCallMsgSize = 1<<31 - 1

MaxCallMsgSize set max gRPC receive message size received from server. If any message size is larger than current value, an error will be reported from gRPC.

View Source 
var MaxConnectionCount uint = 16

MaxConnectionCount is the max gRPC connections that will be established with each tikv-server.

View Source 
var MaxSendMsgSize = 1<<31 - 1

MaxSendMsgSize set max gRPC request message size sent to server. If any request message size is larger than current value, an error will be reported from gRPC.

View Source 
var NewGCHandlerFunc func(storage Storage) (GCHandler, error)

NewGCHandlerFunc creates a new GCHandler. To enable real GC, we should assign the function to `gcworker.NewGCWorker`.

Functions

func NewBackoffFn 

func NewBackoffFn(base, cap, jitter int) func(ctx context.Context) int

NewBackoffFn creates a backoff func which implements exponential backoff with optional jitters. See http://www.awsarchitectureblog.com/2015/03/backoff.html

func NewTestTiKVStore 

func NewTestTiKVStore(client Client, pdClient pd.Client, clientHijack func(Client) Client, pdClientHijack func(pd.Client) pd.Client) (kv.Storage, error)

NewTestTiKVStore creates a test store with Option

func SplitRegionRanges 

func SplitRegionRanges(bo *Backoffer, cache *RegionCache, keyRanges []kv.KeyRange) ([]kv.KeyRange, error)

SplitRegionRanges get the split ranges from pd region.

Types

type Backoffer 

type Backoffer struct {
	context.Context
	// contains filtered or unexported fields
}

Backoffer is a utility for retrying queries.

func NewBackoffer 

func NewBackoffer(ctx context.Context, maxSleep int) *Backoffer

NewBackoffer creates a Backoffer with maximum sleep time(in ms).

func (*Backoffer) Backoff 

func (b *Backoffer) Backoff(typ backoffType, err error) error

Backoff sleeps a while base on the backoffType and records the error message. It returns a retryable error if total sleep time exceeds maxSleep.

func (*Backoffer) Clone 

func (b *Backoffer) Clone() *Backoffer

Clone creates a new Backoffer which keeps current Backoffer's sleep time and errors, and shares current Backoffer's context.

func (*Backoffer) Fork 

func (b *Backoffer) Fork() (*Backoffer, context.CancelFunc)

Fork creates a new Backoffer which keeps current Backoffer's sleep time and errors, and holds a child context of current Backoffer's context.

func (*Backoffer) String 

func (b *Backoffer) String() string

type CachedRegion 

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

CachedRegion encapsulates {Region, TTL}

type Client 

type Client interface {
	// Close should release all data.
	Close() error
	// SendReq sends Request.
	SendReq(ctx context.Context, addr string, req *tikvrpc.Request) (*tikvrpc.Response, error)
}

Client is a client that sends RPC. It should not be used after calling Close().

type CopClient 

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

CopClient is coprocessor client.

func (*CopClient) IsRequestTypeSupported 

func (c *CopClient) IsRequestTypeSupported(reqType, subType int64) bool

IsRequestTypeSupported checks whether reqType is supported.

func (*CopClient) Send 

func (c *CopClient) Send(ctx context.Context, req *kv.Request) kv.Response

Send builds the request and gets the coprocessor iterator response.

type Driver 

type Driver struct {
}

Driver implements engine Driver.

func (Driver) Open 

func (d Driver) Open(path string) (kv.Storage, error)

Open opens or creates an TiKV storage with given path. Path example: tikv://etcd-node1:port,etcd-node2:port?cluster=1&disableGC=false

type EtcdSafePointKV 

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

EtcdSafePointKV implements SafePointKV at runtime

func NewEtcdSafePointKV 

func NewEtcdSafePointKV(addrs []string, tlsConfig *tls.Config) (*EtcdSafePointKV, error)

NewEtcdSafePointKV creates an instance of EtcdSafePointKV

func (*EtcdSafePointKV) Get 

func (w *EtcdSafePointKV) Get(k string) (string, error)

Get implements the Get method for SafePointKV

func (*EtcdSafePointKV) Put 

func (w *EtcdSafePointKV) Put(k string, v string) error

Put implements the Put method for SafePointKV

type GCHandler 

type GCHandler interface {
	// Start starts the GCHandler.
	Start()

	// Close closes the GCHandler.
	Close()
}

GCHandler runs garbage collection job.

type KeyLocation 

type KeyLocation struct {
	Region   RegionVerID
	StartKey []byte
	EndKey   []byte
}

KeyLocation is the region and range that a key is located.

func (*KeyLocation) Contains 

func (l *KeyLocation) Contains(key []byte) bool

Contains checks if key is in [StartKey, EndKey).

type Lock 

type Lock struct {
	Key     []byte
	Primary []byte
	TxnID   uint64
	TTL     uint64
}

Lock represents a lock from tikv server.

func NewLock 

func NewLock(l *kvrpcpb.LockInfo) *Lock

NewLock creates a new *Lock.

type LockResolver 

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

LockResolver resolves locks and also caches resolved txn status.

func NewLockResolver 

func NewLockResolver(etcdAddrs []string, security config.Security) (*LockResolver, error)

NewLockResolver creates a LockResolver. It is exported for other services to use. For instance, binlog service needs to determine a transaction's commit state.

func (*LockResolver) BatchResolveLocks 

func (lr *LockResolver) BatchResolveLocks(bo *Backoffer, locks []*Lock, loc RegionVerID) (bool, error)

BatchResolveLocks resolve locks in a batch

func (*LockResolver) GetTxnStatus 

func (lr *LockResolver) GetTxnStatus(txnID uint64, primary []byte) (TxnStatus, error)

GetTxnStatus queries tikv-server for a txn's status (commit/rollback). If the primary key is still locked, it will launch a Rollback to abort it. To avoid unnecessarily aborting too many txns, it is wiser to wait a few seconds before calling it after Prewrite.

func (*LockResolver) ResolveLocks 

func (lr *LockResolver) ResolveLocks(bo *Backoffer, locks []*Lock) (ok bool, err error)

ResolveLocks tries to resolve Locks. The resolving process is in 3 steps:

  1. Use the `lockTTL` to pick up all expired locks. Only locks that are too old are considered orphan locks and will be handled later. If all locks are expired then all locks will be resolved so the returned `ok` will be true, otherwise caller should sleep a while before retry.
  2. For each lock, query the primary key to get txn(which left the lock)'s commit status.
  3. Send `ResolveLock` cmd to the lock's region to resolve all locks belong to the same transaction.

type MockSafePointKV 

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

MockSafePointKV implements SafePointKV at mock test

func NewMockSafePointKV 

func NewMockSafePointKV() *MockSafePointKV

NewMockSafePointKV creates an instance of MockSafePointKV

func (*MockSafePointKV) Get 

func (w *MockSafePointKV) Get(k string) (string, error)

Get implements the Get method for SafePointKV

func (*MockSafePointKV) Put 

func (w *MockSafePointKV) Put(k string, v string) error

Put implements the Put method for SafePointKV

type RPCContext 

type RPCContext struct {
	Region RegionVerID
	Meta   *metapb.Region
	Peer   *metapb.Peer
	Addr   string
}

RPCContext contains data that is needed to send RPC to a region.

func (*RPCContext) GetStoreID 

func (c *RPCContext) GetStoreID() uint64

GetStoreID returns StoreID.

type RawKVClient 

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

RawKVClient is a client of TiKV server which is used as a key-value storage, only GET/PUT/DELETE commands are supported.

func NewRawKVClient 

func NewRawKVClient(pdAddrs []string, security config.Security) (*RawKVClient, error)

NewRawKVClient creates a client with PD cluster addrs.

func (*RawKVClient) Close 

func (c *RawKVClient) Close() error

Close closes the client.

func (*RawKVClient) ClusterID 

func (c *RawKVClient) ClusterID() uint64

ClusterID returns the TiKV cluster ID.

func (*RawKVClient) Delete 

func (c *RawKVClient) Delete(key []byte) error

Delete deletes a key-value pair from TiKV.

func (*RawKVClient) Get 

func (c *RawKVClient) Get(key []byte) ([]byte, error)

Get queries value with the key. When the key does not exist, it returns `nil, nil`.

func (*RawKVClient) Put 

func (c *RawKVClient) Put(key, value []byte) error

Put stores a key-value pair to TiKV.

func (*RawKVClient) Scan 

func (c *RawKVClient) Scan(startKey []byte, limit int) (keys [][]byte, values [][]byte, err error)

Scan queries continuous kv pairs, starts from startKey, up to limit pairs. If you want to exclude the startKey, append a '\0' to the key: `Scan(append(startKey, '\0'), limit)`.

type Region 

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

Region stores region's meta and its leader peer.

func (*Region) Contains 

func (r *Region) Contains(key []byte) bool

Contains checks whether the key is in the region, for the maximum region endKey is empty. startKey <= key < endKey.

func (*Region) EndKey 

func (r *Region) EndKey() []byte

EndKey returns EndKey.

func (*Region) GetContext 

func (r *Region) GetContext() *kvrpcpb.Context

GetContext constructs kvprotopb.Context from region info.

func (*Region) GetID 

func (r *Region) GetID() uint64

GetID returns id.

func (*Region) OnRequestFail 

func (r *Region) OnRequestFail(storeID uint64) bool

OnRequestFail records unreachable peer and tries to select another valid peer. It returns false if all peers are unreachable.

func (*Region) StartKey 

func (r *Region) StartKey() []byte

StartKey returns StartKey.

func (*Region) SwitchPeer 

func (r *Region) SwitchPeer(storeID uint64) bool

SwitchPeer switches current peer to the one on specific store. It returns false if no peer matches the storeID.

func (*Region) VerID 

func (r *Region) VerID() RegionVerID

VerID returns the Region's RegionVerID.

type RegionCache 

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

RegionCache caches Regions loaded from PD.

func NewRegionCache 

func NewRegionCache(pdClient pd.Client) *RegionCache

NewRegionCache creates a RegionCache.

func (*RegionCache) ClearStoreByID 

func (c *RegionCache) ClearStoreByID(id uint64)

ClearStoreByID clears store from cache with storeID.

func (*RegionCache) DropRegion 

func (c *RegionCache) DropRegion(id RegionVerID)

DropRegion removes a cached Region.

func (*RegionCache) GetRPCContext 

func (c *RegionCache) GetRPCContext(bo *Backoffer, id RegionVerID) (*RPCContext, error)

GetRPCContext returns RPCContext for a region. If it returns nil, the region must be out of date and already dropped from cache.

func (*RegionCache) GetStoreAddr 

func (c *RegionCache) GetStoreAddr(bo *Backoffer, id uint64) (string, error)

GetStoreAddr returns a tikv server's address by its storeID. It checks cache first, sends request to pd server when necessary.

func (*RegionCache) GroupKeysByRegion 

func (c *RegionCache) GroupKeysByRegion(bo *Backoffer, keys [][]byte) (map[RegionVerID][][]byte, RegionVerID, error)

GroupKeysByRegion separates keys into groups by their belonging Regions. Specially it also returns the first key's region which may be used as the 'PrimaryLockKey' and should be committed ahead of others.

func (*RegionCache) ListRegionIDsInKeyRange 

func (c *RegionCache) ListRegionIDsInKeyRange(bo *Backoffer, startKey, endKey []byte) (regionIDs []uint64, err error)

ListRegionIDsInKeyRange lists ids of regions in [start_key,end_key].

func (*RegionCache) LocateKey 

func (c *RegionCache) LocateKey(bo *Backoffer, key []byte) (*KeyLocation, error)

LocateKey searches for the region and range that the key is located.

func (*RegionCache) LocateRegionByID 

func (c *RegionCache) LocateRegionByID(bo *Backoffer, regionID uint64) (*KeyLocation, error)

LocateRegionByID searches for the region with ID.

func (*RegionCache) OnRegionStale 

func (c *RegionCache) OnRegionStale(ctx *RPCContext, newRegions []*metapb.Region) error

OnRegionStale removes the old region and inserts new regions into the cache.

func (*RegionCache) OnRequestFail 

func (c *RegionCache) OnRequestFail(ctx *RPCContext, err error)

OnRequestFail is used for clearing cache when a tikv server does not respond.

func (*RegionCache) PDClient 

func (c *RegionCache) PDClient() pd.Client

PDClient returns the pd.Client in RegionCache.

func (*RegionCache) ReloadStoreAddr 

func (c *RegionCache) ReloadStoreAddr(bo *Backoffer, id uint64) (string, error)

ReloadStoreAddr reloads store's address.

func (*RegionCache) UpdateLeader 

func (c *RegionCache) UpdateLeader(regionID RegionVerID, leaderStoreID uint64)

UpdateLeader update some region cache with newer leader info.

type RegionRequestSender 

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

RegionRequestSender sends KV/Cop requests to tikv server. It handles network errors and some region errors internally.

Typically, a KV/Cop request is bind to a region, all keys that are involved in the request should be located in the region. The sending process begins with looking for the address of leader store's address of the target region from cache, and the request is then sent to the destination tikv server over TCP connection. If region is updated, can be caused by leader transfer, region split, region merge, or region balance, tikv server may not able to process request and send back a RegionError. RegionRequestSender takes care of errors that does not relevant to region range, such as 'I/O timeout', 'NotLeader', and 'ServerIsBusy'. For other errors, since region range have changed, the request may need to split, so we simply return the error to caller.

func NewRegionRequestSender 

func NewRegionRequestSender(regionCache *RegionCache, client Client) *RegionRequestSender

NewRegionRequestSender creates a new sender.

func (*RegionRequestSender) SendReq 

func (s *RegionRequestSender) SendReq(bo *Backoffer, req *tikvrpc.Request, regionID RegionVerID, timeout time.Duration) (*tikvrpc.Response, error)

SendReq sends a request to tikv server.

type RegionVerID 

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

RegionVerID is a unique ID that can identify a Region at a specific version.

func (*RegionVerID) GetID 

func (r *RegionVerID) GetID() uint64

GetID returns the id of the region

type SafePointKV 

type SafePointKV interface {
	Put(k string, v string) error
	Get(k string) (string, error)
}

SafePointKV is used for a seamingless integration for mockTest and runtime.

type Scanner 

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

Scanner support tikv scan

func (*Scanner) Close 

func (s *Scanner) Close()

Close close iterator.

func (*Scanner) Key 

func (s *Scanner) Key() kv.Key

Key return key.

func (*Scanner) Next 

func (s *Scanner) Next() error

Next return next element.

func (*Scanner) Valid 

func (s *Scanner) Valid() bool

Valid return valid.

func (*Scanner) Value 

func (s *Scanner) Value() []byte

Value return value.

type Storage 

type Storage interface {
	kv.Storage

	// GetRegionCache gets the RegionCache.
	GetRegionCache() *RegionCache

	// SendReq sends a request to TiKV.
	SendReq(bo *Backoffer, req *tikvrpc.Request, regionID RegionVerID, timeout time.Duration) (*tikvrpc.Response, error)

	// GetLockResolver gets the LockResolver.
	GetLockResolver() *LockResolver

	// GetSafePointKV gets the SafePointKV.
	GetSafePointKV() SafePointKV

	// UpdateSPCache updates the cache of safe point.
	UpdateSPCache(cachedSP uint64, cachedTime time.Time)

	// GetGCHandler gets the GCHandler.
	GetGCHandler() GCHandler

	// SetOracle sets the Oracle.
	SetOracle(oracle oracle.Oracle)

	// SetTiKVClient sets the TiKV client.
	SetTiKVClient(client Client)

	// GetTiKVClient gets the TiKV client.
	GetTiKVClient() Client

	// Closed returns the closed channel.
	Closed() <-chan struct{}
}

Storage represent the kv.Storage runs on TiKV.

type Store 

type Store struct {
	ID   uint64
	Addr string
}

Store contains a tikv server's address.

type TxnStatus 

type TxnStatus uint64

TxnStatus represents a txn's final status. It should be Commit or Rollback.

func (TxnStatus) CommitTS 

func (s TxnStatus) CommitTS() uint64

CommitTS returns the txn's commitTS. It is valid iff `IsCommitted` is true.

func (TxnStatus) IsCommitted 

func (s TxnStatus) IsCommitted() bool

IsCommitted returns true if the txn's final status is Commit.

Source Files

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Directories

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