tikv

package
v0.0.0-...-74d5ce4 Latest Latest
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 Go to latest Published: Sep 15, 2017 License: Apache-2.0 Imports: 43 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
)

Variables

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")
)

Functions

func NewBackoffFn 

func NewBackoffFn(base, cap, jitter int) func() int

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

func NewMockTikvStore 

func NewMockTikvStore(options ...MockTiKVStoreOption) (kv.Storage, error)

NewMockTikvStore creates a mocked tikv store, the path is the file path to store the data. If path is an empty string, a memory storage will be created.

func ParseEtcdAddr 

func ParseEtcdAddr(path string) (etcdAddrs []string, err error)

ParseEtcdAddr parses path to etcd address list

func RunGCJob 

func RunGCJob(ctx goctx.Context, store kv.Storage, safePoint uint64, identifier string) error

RunGCJob sends GC command to KV. it is exported for testing purpose, do not use it with GCWorker at the same time.

Types

type Backoffer 

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

Backoffer is a utility for retrying queries.

func NewBackoffer 

func NewBackoffer(maxSleep int, ctx goctx.Context) *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, goctx.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 Client 

type Client interface {
	// Close should release all data.
	Close() error
	// SendReq sends Request.
	SendReq(ctx goctx.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 goctx.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 GCWorker 

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

GCWorker periodically triggers GC process on tikv server.

func NewGCWorker 

func NewGCWorker(store kv.Storage) (*GCWorker, error)

NewGCWorker creates a GCWorker instance.

func (*GCWorker) Close 

func (w *GCWorker) Close()

Close stops background goroutines.

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.

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) (*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) 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 MockDriver 

type MockDriver struct {
}

MockDriver is in memory mock TiKV driver.

func (MockDriver) Open 

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

Open creates a MockTiKV storage.

type MockGCWorker 

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

MockGCWorker is for test.

func NewMockGCWorker 

func NewMockGCWorker(store kv.Storage) (*MockGCWorker, error)

NewMockGCWorker creates a MockGCWorker instance ONLY for test.

func (*MockGCWorker) DeleteRanges 

func (w *MockGCWorker) DeleteRanges(ctx goctx.Context, safePoint uint64) error

DeleteRanges call deleteRanges internally, just for test.

type MockTiKVStoreOption 

type MockTiKVStoreOption func(*mockOptions)

MockTiKVStoreOption is used to control some behavior of mock tikv.

func WithCluster 

func WithCluster(cluster *mocktikv.Cluster) MockTiKVStoreOption

WithCluster provides the customized cluster.

func WithHijackClient 

func WithHijackClient(wrap func(Client) Client) MockTiKVStoreOption

WithHijackClient hijacks KV client's behavior, makes it easy to simulate the network problem between TiDB and TiKV.

func WithHijackPDClient 

func WithHijackPDClient(wrap func(pd.Client) pd.Client) MockTiKVStoreOption

WithHijackPDClient hijacks PD client's behavior, makes it easy to simulate the network problem between TiDB and PD, such as GetTS too slow, GetStore or GetRegion fail.

func WithMVCCStore 

func WithMVCCStore(store mocktikv.MVCCStore) MockTiKVStoreOption

WithMVCCStore provides the customized mvcc store.

func WithPath 

func WithPath(path string) MockTiKVStoreOption

WithPath specifies the mocktikv path.

type RPCContext 

type RPCContext struct {
	Region RegionVerID
	KVCtx  *kvrpcpb.Context
	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) (*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, isolationLevel kvrpcpb.IsolationLevel) *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.

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 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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