vtgate

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Version: v2.0.0-rc.1+incompatible Latest Latest
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Published: Jun 7, 2016 License: BSD-3-Clause Imports: 45 Imported by: 0

Documentation

Overview

Package vtgate provides query routing rpc services for vttablets.

Package vtgate provides query routing rpc services for vttablets.

Index

Constants

View Source
const (
	PrioritySuccess = iota
	PriorityTransientError
	PriorityQueryNotServed
	PriorityDeadlineExceeded
	PriorityCancelled
	PriorityIntegrityError
	PriorityNotInTx
	PriorityUnknownError
	PriorityInternalError
	PriorityResourceExhausted
	PriorityUnauthenticated
	PriorityPermissionDenied
	PriorityBadInput
)

A list of all vtrpcpb.ErrorCodes, ordered by priority. These priorities are used when aggregating multiple errors in VtGate. Higher priority error codes are more urgent for users to see. They are prioritized based on the following question: assuming a scatter query produced multiple errors, which of the errors is the most likely to give the user useful information about why the query failed and how they should proceed?

Variables

View Source
var (
	// GatewayImplementation controls the implementation of Gateway.
	GatewayImplementation = flag.String("gateway_implementation", "discoverygateway", "The implementation of gateway")
)
View Source
var RegisterVTGates []RegisterVTGate

RegisterVTGates stores register funcs for VTGate server.

Functions

func AggregateVtGateErrors

func AggregateVtGateErrors(errors []error) error

AggregateVtGateErrors aggregates several VtErrors.

func RegisterGatewayCreator

func RegisterGatewayCreator(name string, gc GatewayCreator)

RegisterGatewayCreator registers a GatewayCreator with given name.

func StrsEquals

func StrsEquals(a, b []string) bool

StrsEquals compares contents of two string slices.

func WrapError

func WrapError(in error, keyspace, shard string, tabletType topodatapb.TabletType, tablet *topodatapb.Tablet, inTransaction bool) (wrapped error)

WrapError returns ShardError which preserves the original error code if possible, adds the connection context and adds a bit to determine whether the keyspace/shard needs to be re-resolved for a potential sharding event.

Types

type Gateway

type Gateway interface {
	// Execute executes the non-streaming query for the specified keyspace, shard, and tablet type.
	Execute(ctx context.Context, keyspace, shard string, tabletType topodatapb.TabletType, query string, bindVars map[string]interface{}, transactionID int64) (*sqltypes.Result, error)

	// ExecuteBatch executes a group of queries for the specified keyspace, shard, and tablet type.
	ExecuteBatch(ctx context.Context, keyspace, shard string, tabletType topodatapb.TabletType, queries []querytypes.BoundQuery, asTransaction bool, transactionID int64) ([]sqltypes.Result, error)

	// StreamExecute executes a streaming query for the specified keyspace, shard, and tablet type.
	StreamExecute(ctx context.Context, keyspace, shard string, tabletType topodatapb.TabletType, query string, bindVars map[string]interface{}) (sqltypes.ResultStream, error)

	// Begin starts a transaction for the specified keyspace, shard, and tablet type.
	// It returns the transaction ID.
	Begin(ctx context.Context, keyspace string, shard string, tabletType topodatapb.TabletType) (int64, error)

	// Commit commits the current transaction for the specified keyspace, shard, and tablet type.
	Commit(ctx context.Context, keyspace, shard string, tabletType topodatapb.TabletType, transactionID int64) error

	// Rollback rolls back the current transaction for the specified keyspace, shard, and tablet type.
	Rollback(ctx context.Context, keyspace, shard string, tabletType topodatapb.TabletType, transactionID int64) error

	// BeginExecute executes a begin and the non-streaming query
	// for the specified keyspace, shard, and tablet type.
	BeginExecute(ctx context.Context, keyspace, shard string, tabletType topodatapb.TabletType, query string, bindVars map[string]interface{}) (*sqltypes.Result, int64, error)

	// BeginExecuteBatch executes a begin and a group of queries
	// for the specified keyspace, shard, and tablet type.
	BeginExecuteBatch(ctx context.Context, keyspace, shard string, tabletType topodatapb.TabletType, queries []querytypes.BoundQuery, asTransaction bool) ([]sqltypes.Result, int64, error)

	// SplitQuery splits a query into sub-queries for the specified keyspace, shard, and tablet type.
	SplitQuery(ctx context.Context, keyspace, shard string, tabletType topodatapb.TabletType, sql string, bindVariables map[string]interface{}, splitColumn string, splitCount int64) ([]querytypes.QuerySplit, error)

	// SplitQuery splits a query into sub-queries for the specified keyspace, shard, and tablet type.
	// TODO(erez): Rename to SplitQuery after migration to SplitQuery V2.
	SplitQueryV2(
		ctx context.Context,
		keyspace,
		shard string,
		tabletType topodatapb.TabletType,
		sql string,
		bindVariables map[string]interface{},
		splitColumns []string,
		splitCount int64,
		numRowsPerQueryPart int64,
		algorithm querypb.SplitQueryRequest_Algorithm) ([]querytypes.QuerySplit, error)

	// Close shuts down underlying connections.
	Close(ctx context.Context) error

	// CacheStatus returns a list of GatewayTabletCacheStatus per tablet.
	CacheStatus() GatewayTabletCacheStatusList
}

A Gateway is the query processing module for each shard, which is used by ScatterConn.

type GatewayCreator

type GatewayCreator func(hc discovery.HealthCheck, topoServer topo.Server, serv topo.SrvTopoServer, cell string, retryCount int, tabletTypesToWait []topodatapb.TabletType) Gateway

GatewayCreator is the func which can create the actual gateway object.

func GetGatewayCreator

func GetGatewayCreator() GatewayCreator

GetGatewayCreator returns the GatewayCreator specified by GatewayImplementation flag.

func GetGatewayCreatorByName

func GetGatewayCreatorByName(name string) GatewayCreator

GetGatewayCreatorByName returns the GatewayCreator specified by the given name.

type GatewayTabletCacheStatus

type GatewayTabletCacheStatus struct {
	Keyspace   string
	Shard      string
	TabletType topodatapb.TabletType
	Name       string
	Addr       string

	QueryCount uint64
	QueryError uint64
	QPS        uint64
	AvgLatency float64 // in milliseconds
}

GatewayTabletCacheStatus contains the status per tablet for a gateway.

type GatewayTabletCacheStatusList

type GatewayTabletCacheStatusList []*GatewayTabletCacheStatus

GatewayTabletCacheStatusList is a slice of GatewayTabletCacheStatus.

func (GatewayTabletCacheStatusList) Len

func (gtcsl GatewayTabletCacheStatusList) Len() int

Len is part of sort.Interface.

func (GatewayTabletCacheStatusList) Less

func (gtcsl GatewayTabletCacheStatusList) Less(i, j int) bool

Less is part of sort.Interface.

func (GatewayTabletCacheStatusList) Swap

func (gtcsl GatewayTabletCacheStatusList) Swap(i, j int)

Swap is part of sort.Interface.

type GatewayTabletStatusAggregator

type GatewayTabletStatusAggregator struct {
	Keyspace   string
	Shard      string
	TabletType topodatapb.TabletType
	Name       string // the alternative name of a tablet
	Addr       string // the host:port of a tablet

	QueryCount uint64
	QueryError uint64
	// contains filtered or unexported fields
}

GatewayTabletStatusAggregator tracks tablet status for a gateway.

func NewGatewayTabletStatusAggregator

func NewGatewayTabletStatusAggregator() *GatewayTabletStatusAggregator

NewGatewayTabletStatusAggregator creates a GatewayTabletStatusAggregator.

func (*GatewayTabletStatusAggregator) GetCacheStatus

GetCacheStatus returns a GatewayTabletCacheStatus representing the current gateway status.

func (*GatewayTabletStatusAggregator) UpdateQueryInfo

func (gepsa *GatewayTabletStatusAggregator) UpdateQueryInfo(addr string, tabletType topodatapb.TabletType, elapsed time.Duration, hasError bool)

UpdateQueryInfo updates the aggregator with the given information about a query.

type Planner

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

Planner is used to compute the plan. It contains the vschema, and has a cache of previous computed plans.

func NewPlanner

func NewPlanner(ctx context.Context, serv topo.SrvTopoServer, cell string, cacheSize int) *Planner

NewPlanner creates a new planner for VTGate. It will watch the vschema in the topology until the ctx is closed.

func (*Planner) GetPlan

func (plr *Planner) GetPlan(sql, keyspace string) (*engine.Plan, error)

GetPlan computes the plan for the given query. If one is in the cache, it reuses it.

func (*Planner) ServeHTTP

func (plr *Planner) ServeHTTP(response http.ResponseWriter, request *http.Request)

ServeHTTP shows the current plans in the query cache.

func (*Planner) VSchema

func (plr *Planner) VSchema() *vindexes.VSchema

VSchema returns the VSchema.

func (*Planner) WatchSrvVSchema

func (plr *Planner) WatchSrvVSchema(ctx context.Context, cell string)

WatchSrvVSchema watches the SrvVSchema from the topo. The function does not return an error. It instead logs warnings on failure. The SrvVSchema object is roll-up of all the Keyspace information, so when a keyspace is added or removed, it will be properly updated.

This function will wait until the first value has either been processed or triggered an error before returning.

type RegisterVTGate

type RegisterVTGate func(vtgateservice.VTGateService)

RegisterVTGate defines the type of registration mechanism.

type ResilientSrvTopoServer

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

ResilientSrvTopoServer is an implementation of SrvTopoServer based on a topo.Server that uses a cache for two purposes: - limit the QPS to the underlying topo.Server - return the last known value of the data if there is an error

func NewResilientSrvTopoServer

func NewResilientSrvTopoServer(base topo.Server, counterPrefix string) *ResilientSrvTopoServer

NewResilientSrvTopoServer creates a new ResilientSrvTopoServer based on the provided topo.Server.

func (*ResilientSrvTopoServer) CacheStatus

CacheStatus returns a displayable version of the cache

func (*ResilientSrvTopoServer) GetSrvKeyspace

func (server *ResilientSrvTopoServer) GetSrvKeyspace(ctx context.Context, cell, keyspace string) (*topodatapb.SrvKeyspace, error)

GetSrvKeyspace returns SrvKeyspace object for the given cell and keyspace.

func (*ResilientSrvTopoServer) GetSrvKeyspaceNames

func (server *ResilientSrvTopoServer) GetSrvKeyspaceNames(ctx context.Context, cell string) ([]string, error)

GetSrvKeyspaceNames returns all keyspace names for the given cell.

func (*ResilientSrvTopoServer) WatchSrvVSchema

func (server *ResilientSrvTopoServer) WatchSrvVSchema(ctx context.Context, cell string) (notifications <-chan *vschemapb.SrvVSchema, err error)

WatchSrvVSchema is part of the SrvTopoServer API

type ResilientSrvTopoServerCacheStatus

type ResilientSrvTopoServerCacheStatus struct {
	SrvKeyspaceNames SrvKeyspaceNamesCacheStatusList
	SrvKeyspaces     SrvKeyspaceCacheStatusList
}

ResilientSrvTopoServerCacheStatus has the full status of the cache

type Resolver

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

Resolver is the layer to resolve KeyspaceIds and KeyRanges to shards. It will try to re-resolve shards if ScatterConn returns retryable error, which may imply horizontal or vertical resharding happened.

func NewResolver

func NewResolver(hc discovery.HealthCheck, topoServer topo.Server, serv topo.SrvTopoServer, statsName, cell string, retryCount int, tabletTypesToWait []topodatapb.TabletType) *Resolver

NewResolver creates a new Resolver. All input parameters are passed through for creating ScatterConn.

func (*Resolver) Commit

func (res *Resolver) Commit(ctx context.Context, inSession *vtgatepb.Session) error

Commit commits a transaction.

func (*Resolver) Execute

func (res *Resolver) Execute(
	ctx context.Context,
	sql string,
	bindVars map[string]interface{},
	keyspace string,
	tabletType topodatapb.TabletType,
	session *vtgatepb.Session,
	mapToShards func(string) (string, []string, error),
	notInTransaction bool,
) (*sqltypes.Result, error)

Execute executes a non-streaming query based on shards resolved by given func. It retries query if new keyspace/shards are re-resolved after a retryable error.

func (*Resolver) ExecuteBatch

func (res *Resolver) ExecuteBatch(
	ctx context.Context,
	tabletType topodatapb.TabletType,
	asTransaction bool,
	session *vtgatepb.Session,
	buildBatchRequest func() (*scatterBatchRequest, error),
) ([]sqltypes.Result, error)

ExecuteBatch executes a group of queries based on shards resolved by given func. It retries query if new keyspace/shards are re-resolved after a retryable error.

func (*Resolver) ExecuteBatchKeyspaceIds

func (res *Resolver) ExecuteBatchKeyspaceIds(ctx context.Context, queries []*vtgatepb.BoundKeyspaceIdQuery, tabletType topodatapb.TabletType, asTransaction bool, session *vtgatepb.Session) ([]sqltypes.Result, error)

ExecuteBatchKeyspaceIds executes a group of queries based on KeyspaceIds. It retries query if new keyspace/shards are re-resolved after a retryable error.

func (*Resolver) ExecuteEntityIds

func (res *Resolver) ExecuteEntityIds(
	ctx context.Context,
	sql string,
	bindVariables map[string]interface{},
	keyspace string,
	entityColumnName string,
	entityKeyspaceIDs []*vtgatepb.ExecuteEntityIdsRequest_EntityId,
	tabletType topodatapb.TabletType,
	session *vtgatepb.Session,
	notInTransaction bool,
) (*sqltypes.Result, error)

ExecuteEntityIds executes a non-streaming query based on given KeyspaceId map. It retries query if new keyspace/shards are re-resolved after a retryable error.

func (*Resolver) ExecuteKeyRanges

func (res *Resolver) ExecuteKeyRanges(ctx context.Context, sql string, bindVariables map[string]interface{}, keyspace string, keyRanges []*topodatapb.KeyRange, tabletType topodatapb.TabletType, session *vtgatepb.Session, notInTransaction bool) (*sqltypes.Result, error)

ExecuteKeyRanges executes a non-streaming query based on KeyRanges. It retries query if new keyspace/shards are re-resolved after a retryable error.

func (*Resolver) ExecuteKeyspaceIds

func (res *Resolver) ExecuteKeyspaceIds(ctx context.Context, sql string, bindVariables map[string]interface{}, keyspace string, keyspaceIds [][]byte, tabletType topodatapb.TabletType, session *vtgatepb.Session, notInTransaction bool) (*sqltypes.Result, error)

ExecuteKeyspaceIds executes a non-streaming query based on KeyspaceIds. It retries query if new keyspace/shards are re-resolved after a retryable error. This throws an error if a dml spans multiple keyspace_ids. Resharding depends on being able to uniquely route a write.

func (*Resolver) GetGatewayCacheStatus

func (res *Resolver) GetGatewayCacheStatus() GatewayTabletCacheStatusList

GetGatewayCacheStatus returns a displayable version of the Gateway cache.

func (*Resolver) Rollback

func (res *Resolver) Rollback(ctx context.Context, inSession *vtgatepb.Session) error

Rollback rolls back a transaction.

func (*Resolver) StreamExecute

func (res *Resolver) StreamExecute(
	ctx context.Context,
	sql string,
	bindVars map[string]interface{},
	keyspace string,
	tabletType topodatapb.TabletType,
	mapToShards func(string) (string, []string, error),
	sendReply func(*sqltypes.Result) error,
) error

StreamExecute executes a streaming query on shards resolved by given func. This function currently temporarily enforces the restriction of executing on one shard since it cannot merge-sort the results to guarantee ordering of response which is needed for checkpointing.

func (*Resolver) StreamExecuteKeyRanges

func (res *Resolver) StreamExecuteKeyRanges(ctx context.Context, sql string, bindVariables map[string]interface{}, keyspace string, keyRanges []*topodatapb.KeyRange, tabletType topodatapb.TabletType, sendReply func(*sqltypes.Result) error) error

StreamExecuteKeyRanges executes a streaming query on the specified KeyRanges. The KeyRanges are resolved to shards using the serving graph. This function currently temporarily enforces the restriction of executing on one shard since it cannot merge-sort the results to guarantee ordering of response which is needed for checkpointing. The api supports supplying multiple keyranges to make it future proof.

func (*Resolver) StreamExecuteKeyspaceIds

func (res *Resolver) StreamExecuteKeyspaceIds(ctx context.Context, sql string, bindVariables map[string]interface{}, keyspace string, keyspaceIds [][]byte, tabletType topodatapb.TabletType, sendReply func(*sqltypes.Result) error) error

StreamExecuteKeyspaceIds executes a streaming query on the specified KeyspaceIds. The KeyspaceIds are resolved to shards using the serving graph. This function currently temporarily enforces the restriction of executing on one shard since it cannot merge-sort the results to guarantee ordering of response which is needed for checkpointing. The api supports supplying multiple KeyspaceIds to make it future proof.

type Router

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

Router is the layer to route queries to the correct shards based on the values in the query.

func NewRouter

func NewRouter(ctx context.Context, serv topo.SrvTopoServer, cell, statsName string, scatterConn *ScatterConn) *Router

NewRouter creates a new Router.

func (*Router) Execute

func (rtr *Router) Execute(ctx context.Context, sql string, bindVars map[string]interface{}, keyspace string, tabletType topodatapb.TabletType, session *vtgatepb.Session, notInTransaction bool) (*sqltypes.Result, error)

Execute routes a non-streaming query.

func (*Router) ExecuteRoute

func (rtr *Router) ExecuteRoute(vcursor *requestContext, route *engine.Route, joinvars map[string]interface{}) (*sqltypes.Result, error)

ExecuteRoute executes the route query for all route opcodes.

func (*Router) GetRouteFields

func (rtr *Router) GetRouteFields(vcursor *requestContext, route *engine.Route, joinvars map[string]interface{}) (*sqltypes.Result, error)

GetRouteFields fetches the field info for the route.

func (*Router) StreamExecute

func (rtr *Router) StreamExecute(ctx context.Context, sql string, bindVars map[string]interface{}, keyspace string, tabletType topodatapb.TabletType, sendReply func(*sqltypes.Result) error) error

StreamExecute executes a streaming query.

func (*Router) StreamExecuteRoute

func (rtr *Router) StreamExecuteRoute(vcursor *requestContext, route *engine.Route, joinvars map[string]interface{}, sendReply func(*sqltypes.Result) error) error

StreamExecuteRoute performs a streaming route. Only selects are allowed.

type SafeSession

type SafeSession struct {
	*vtgatepb.Session
	// contains filtered or unexported fields
}

SafeSession is a mutex-protected version of the Session. It is thread-safe if each thread only accesses one shard. (the use pattern is 'Find', if not found, then 'Append', for a single shard)

func NewSafeSession

func NewSafeSession(sessn *vtgatepb.Session) *SafeSession

NewSafeSession returns a new SafeSession based on the Session

func (*SafeSession) Append

func (session *SafeSession) Append(shardSession *vtgatepb.Session_ShardSession)

Append adds a new ShardSession

func (*SafeSession) Find

func (session *SafeSession) Find(keyspace, shard string, tabletType topodatapb.TabletType) int64

Find returns the transactionId, if any, for a session

func (*SafeSession) InTransaction

func (session *SafeSession) InTransaction() bool

InTransaction returns true if we are in a transaction

func (*SafeSession) Reset

func (session *SafeSession) Reset()

Reset clears the session

type ScatterConn

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

ScatterConn is used for executing queries across multiple shard level connections.

func NewScatterConn

func NewScatterConn(hc discovery.HealthCheck, topoServer topo.Server, serv topo.SrvTopoServer, statsName, cell string, retryCount int, tabletTypesToWait []topodatapb.TabletType) *ScatterConn

NewScatterConn creates a new ScatterConn. All input parameters are passed through for creating the appropriate connections.

func (*ScatterConn) Close

func (stc *ScatterConn) Close() error

Close closes the underlying Gateway.

func (*ScatterConn) Commit

func (stc *ScatterConn) Commit(ctx context.Context, session *SafeSession) (err error)

Commit commits the current transaction. There are no retries on this operation.

func (*ScatterConn) Execute

func (stc *ScatterConn) Execute(
	ctx context.Context,
	query string,
	bindVars map[string]interface{},
	keyspace string,
	shards []string,
	tabletType topodatapb.TabletType,
	session *SafeSession,
	notInTransaction bool,
) (*sqltypes.Result, error)

Execute executes a non-streaming query on the specified shards.

func (*ScatterConn) ExecuteBatch

func (stc *ScatterConn) ExecuteBatch(
	ctx context.Context,
	batchRequest *scatterBatchRequest,
	tabletType topodatapb.TabletType,
	asTransaction bool,
	session *SafeSession) (qrs []sqltypes.Result, err error)

ExecuteBatch executes a batch of non-streaming queries on the specified shards.

func (*ScatterConn) ExecuteEntityIds

func (stc *ScatterConn) ExecuteEntityIds(
	ctx context.Context,
	shards []string,
	sqls map[string]string,
	bindVars map[string]map[string]interface{},
	keyspace string,
	tabletType topodatapb.TabletType,
	session *SafeSession,
	notInTransaction bool,
) (*sqltypes.Result, error)

ExecuteEntityIds executes queries that are shard specific.

func (*ScatterConn) ExecuteMulti

func (stc *ScatterConn) ExecuteMulti(
	ctx context.Context,
	query string,
	keyspace string,
	shardVars map[string]map[string]interface{},
	tabletType topodatapb.TabletType,
	session *SafeSession,
	notInTransaction bool,
) (*sqltypes.Result, error)

ExecuteMulti is like Execute, but each shard gets its own bindVars. If len(shards) is not equal to len(bindVars), the function panics.

func (*ScatterConn) GetGatewayCacheStatus

func (stc *ScatterConn) GetGatewayCacheStatus() GatewayTabletCacheStatusList

GetGatewayCacheStatus returns a displayable version of the Gateway cache.

func (*ScatterConn) Rollback

func (stc *ScatterConn) Rollback(ctx context.Context, session *SafeSession) (err error)

Rollback rolls back the current transaction. There are no retries on this operation.

func (*ScatterConn) SplitQueryCustomSharding

func (stc *ScatterConn) SplitQueryCustomSharding(ctx context.Context, sql string, bindVariables map[string]interface{}, splitColumn string, splitCount int64, shards []string, keyspace string) ([]*vtgatepb.SplitQueryResponse_Part, error)

SplitQueryCustomSharding scatters a SplitQuery request to all shards. For a set of splits received from a shard, it construct a KeyRange queries by appending that shard's name to the splits. Aggregates all splits across all shards in no specific order and returns.

func (*ScatterConn) SplitQueryKeyRange

func (stc *ScatterConn) SplitQueryKeyRange(ctx context.Context, sql string, bindVariables map[string]interface{}, splitColumn string, splitCount int64, keyRangeByShard map[string]*topodatapb.KeyRange, keyspace string) ([]*vtgatepb.SplitQueryResponse_Part, error)

SplitQueryKeyRange scatters a SplitQuery request to all shards. For a set of splits received from a shard, it construct a KeyRange queries by appending that shard's keyrange to the splits. Aggregates all splits across all shards in no specific order and returns.

func (*ScatterConn) SplitQueryV2

func (stc *ScatterConn) SplitQueryV2(
	ctx context.Context,
	sql string,
	bindVariables map[string]interface{},
	splitColumns []string,
	perShardSplitCount int64,
	numRowsPerQueryPart int64,
	algorithm querypb.SplitQueryRequest_Algorithm,
	shards []string,
	querySplitToQueryPartFunc func(
		querySplit *querytypes.QuerySplit, shard string) (*vtgatepb.SplitQueryResponse_Part, error),
	keyspace string) ([]*vtgatepb.SplitQueryResponse_Part, error)

SplitQueryV2 scatters a SplitQueryV2 request to the shards whose names are given in 'shards'. For every set of querytypes.QuerySplit's received from a shard, it applies the given 'querySplitToPartFunc' function to convert each querytypes.QuerySplit into a 'SplitQueryResponse_Part' message. Finally, it aggregates the obtained SplitQueryResponse_Parts across all shards and returns the resulting slice. TODO(erez): Remove 'scatterConn.SplitQuery' and rename this method to SplitQuery once the migration to SplitQuery V2 is done.

func (*ScatterConn) StreamExecute

func (stc *ScatterConn) StreamExecute(
	ctx context.Context,
	query string,
	bindVars map[string]interface{},
	keyspace string,
	shards []string,
	tabletType topodatapb.TabletType,
	sendReply func(reply *sqltypes.Result) error,
) error

StreamExecute executes a streaming query on vttablet. The retry rules are the same.

func (*ScatterConn) StreamExecuteMulti

func (stc *ScatterConn) StreamExecuteMulti(
	ctx context.Context,
	query string,
	keyspace string,
	shardVars map[string]map[string]interface{},
	tabletType topodatapb.TabletType,
	sendReply func(reply *sqltypes.Result) error,
) error

StreamExecuteMulti is like StreamExecute, but each shard gets its own bindVars. If len(shards) is not equal to len(bindVars), the function panics.

type ScatterConnError

type ScatterConnError struct {
	Retryable bool
	// Preserve the original errors, so that we don't need to parse the error string.
	Errs []error
	// contains filtered or unexported fields
}

ScatterConnError is the ScatterConn specific error. It implements vterrors.VtError.

func (*ScatterConnError) Error

func (e *ScatterConnError) Error() string

func (*ScatterConnError) VtErrorCode

func (e *ScatterConnError) VtErrorCode() vtrpcpb.ErrorCode

VtErrorCode returns the underlying Vitess error code This is part of vterrors.VtError interface.

type ShardError

type ShardError struct {
	// ShardIdentifier is the keyspace+shard.
	ShardIdentifier string
	// InTransaction indicates if it is inside a transaction.
	InTransaction bool
	// Err preserves the original error, so that we don't need to parse the error string.
	Err error
	// ErrorCode is the error code to use for all the tablet errors in aggregate
	ErrorCode vtrpcpb.ErrorCode
}

ShardError is the error about a specific shard. It implements vterrors.VtError.

func (*ShardError) Error

func (e *ShardError) Error() string

Error returns the error string.

func (*ShardError) VtErrorCode

func (e *ShardError) VtErrorCode() vtrpcpb.ErrorCode

VtErrorCode returns the underlying Vitess error code. This is part of vterrors.VtError interface.

type SrvKeyspaceCacheStatus

type SrvKeyspaceCacheStatus struct {
	Cell         string
	Keyspace     string
	Value        *topodatapb.SrvKeyspace
	LastError    error
	LastErrorCtx context.Context
}

SrvKeyspaceCacheStatus is the current value for a SrvKeyspace object

func (*SrvKeyspaceCacheStatus) StatusAsHTML

func (st *SrvKeyspaceCacheStatus) StatusAsHTML() template.HTML

StatusAsHTML returns an HTML version of our status. It works best if there is data in the cache.

type SrvKeyspaceCacheStatusList

type SrvKeyspaceCacheStatusList []*SrvKeyspaceCacheStatus

SrvKeyspaceCacheStatusList is used for sorting

func (SrvKeyspaceCacheStatusList) Len

func (skcsl SrvKeyspaceCacheStatusList) Len() int

Len is part of sort.Interface

func (SrvKeyspaceCacheStatusList) Less

func (skcsl SrvKeyspaceCacheStatusList) Less(i, j int) bool

Less is part of sort.Interface

func (SrvKeyspaceCacheStatusList) Swap

func (skcsl SrvKeyspaceCacheStatusList) Swap(i, j int)

Swap is part of sort.Interface

type SrvKeyspaceNamesCacheStatus

type SrvKeyspaceNamesCacheStatus struct {
	Cell         string
	Value        []string
	LastError    error
	LastErrorCtx context.Context
}

SrvKeyspaceNamesCacheStatus is the current value for SrvKeyspaceNames

type SrvKeyspaceNamesCacheStatusList

type SrvKeyspaceNamesCacheStatusList []*SrvKeyspaceNamesCacheStatus

SrvKeyspaceNamesCacheStatusList is used for sorting

func (SrvKeyspaceNamesCacheStatusList) Len

func (skncsl SrvKeyspaceNamesCacheStatusList) Len() int

Len is part of sort.Interface

func (SrvKeyspaceNamesCacheStatusList) Less

func (skncsl SrvKeyspaceNamesCacheStatusList) Less(i, j int) bool

Less is part of sort.Interface

func (SrvKeyspaceNamesCacheStatusList) Swap

func (skncsl SrvKeyspaceNamesCacheStatusList) Swap(i, j int)

Swap is part of sort.Interface

type VTGate

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

VTGate is the rpc interface to vtgate. Only one instance can be created. It implements vtgateservice.VTGateService

func Init

func Init(ctx context.Context, hc discovery.HealthCheck, topoServer topo.Server, serv topo.SrvTopoServer, cell string, retryCount int, tabletTypesToWait []topodatapb.TabletType) *VTGate

Init initializes VTGate server.

func (*VTGate) Begin

func (vtg *VTGate) Begin(ctx context.Context) (*vtgatepb.Session, error)

Begin begins a transaction. It has to be concluded by a Commit or Rollback.

func (*VTGate) Commit

func (vtg *VTGate) Commit(ctx context.Context, session *vtgatepb.Session) error

Commit commits a transaction.

func (*VTGate) Execute

func (vtg *VTGate) Execute(ctx context.Context, sql string, bindVariables map[string]interface{}, keyspace string, tabletType topodatapb.TabletType, session *vtgatepb.Session, notInTransaction bool) (*sqltypes.Result, error)

Execute executes a non-streaming query by routing based on the values in the query.

func (*VTGate) ExecuteBatchKeyspaceIds

func (vtg *VTGate) ExecuteBatchKeyspaceIds(ctx context.Context, queries []*vtgatepb.BoundKeyspaceIdQuery, tabletType topodatapb.TabletType, asTransaction bool, session *vtgatepb.Session) ([]sqltypes.Result, error)

ExecuteBatchKeyspaceIds executes a group of queries based on the specified keyspace ids.

func (*VTGate) ExecuteBatchShards

func (vtg *VTGate) ExecuteBatchShards(ctx context.Context, queries []*vtgatepb.BoundShardQuery, tabletType topodatapb.TabletType, asTransaction bool, session *vtgatepb.Session) ([]sqltypes.Result, error)

ExecuteBatchShards executes a group of queries on the specified shards.

func (*VTGate) ExecuteEntityIds

func (vtg *VTGate) ExecuteEntityIds(ctx context.Context, sql string, bindVariables map[string]interface{}, keyspace string, entityColumnName string, entityKeyspaceIDs []*vtgatepb.ExecuteEntityIdsRequest_EntityId, tabletType topodatapb.TabletType, session *vtgatepb.Session, notInTransaction bool) (*sqltypes.Result, error)

ExecuteEntityIds excutes a non-streaming query based on given KeyspaceId map.

func (*VTGate) ExecuteKeyRanges

func (vtg *VTGate) ExecuteKeyRanges(ctx context.Context, sql string, bindVariables map[string]interface{}, keyspace string, keyRanges []*topodatapb.KeyRange, tabletType topodatapb.TabletType, session *vtgatepb.Session, notInTransaction bool) (*sqltypes.Result, error)

ExecuteKeyRanges executes a non-streaming query based on the specified keyranges.

func (*VTGate) ExecuteKeyspaceIds

func (vtg *VTGate) ExecuteKeyspaceIds(ctx context.Context, sql string, bindVariables map[string]interface{}, keyspace string, keyspaceIds [][]byte, tabletType topodatapb.TabletType, session *vtgatepb.Session, notInTransaction bool) (*sqltypes.Result, error)

ExecuteKeyspaceIds executes a non-streaming query based on the specified keyspace ids.

func (*VTGate) ExecuteShards

func (vtg *VTGate) ExecuteShards(ctx context.Context, sql string, bindVariables map[string]interface{}, keyspace string, shards []string, tabletType topodatapb.TabletType, session *vtgatepb.Session, notInTransaction bool) (*sqltypes.Result, error)

ExecuteShards executes a non-streaming query on the specified shards.

func (*VTGate) GetGatewayCacheStatus

func (vtg *VTGate) GetGatewayCacheStatus() GatewayTabletCacheStatusList

GetGatewayCacheStatus returns a displayable version of the Gateway cache.

func (*VTGate) GetSrvKeyspace

func (vtg *VTGate) GetSrvKeyspace(ctx context.Context, keyspace string) (*topodatapb.SrvKeyspace, error)

GetSrvKeyspace is part of the vtgate service API.

func (*VTGate) HandlePanic

func (vtg *VTGate) HandlePanic(err *error)

HandlePanic recovers from panics, and logs / increment counters

func (*VTGate) IsHealthy

func (vtg *VTGate) IsHealthy() error

IsHealthy returns nil if server is healthy. Otherwise, it returns an error indicating the reason.

func (*VTGate) Rollback

func (vtg *VTGate) Rollback(ctx context.Context, session *vtgatepb.Session) error

Rollback rolls back a transaction.

func (*VTGate) SplitQuery

func (vtg *VTGate) SplitQuery(ctx context.Context, keyspace string, sql string, bindVariables map[string]interface{}, splitColumn string, splitCount int64) ([]*vtgatepb.SplitQueryResponse_Part, error)

SplitQuery splits a query into sub queries by appending keyranges and primary key range clauses. Rows corresponding to the sub queries are guaranteed to be non-overlapping and will add up to the rows of original query. Number of sub queries will be a multiple of N that is greater than or equal to SplitQueryRequest.SplitCount, where N is the number of shards.

func (*VTGate) SplitQueryV2

func (vtg *VTGate) SplitQueryV2(
	ctx context.Context,
	keyspace string,
	sql string,
	bindVariables map[string]interface{},
	splitColumns []string,
	splitCount int64,
	numRowsPerQueryPart int64,
	algorithm querypb.SplitQueryRequest_Algorithm) ([]*vtgatepb.SplitQueryResponse_Part, error)

SplitQueryV2 implements the SplitQuery RPC. This is the new version that supports multiple split-columns and multiple splitting algorithms. See the documentation of SplitQueryRequest in "proto/vtgate.proto" for more information. TODO(erez): Remove 'SplitQuery' and rename this method to 'SplitQuery' once the migration to SplitQuery-V2 is done.

func (*VTGate) StreamExecute

func (vtg *VTGate) StreamExecute(ctx context.Context, sql string, bindVariables map[string]interface{}, keyspace string, tabletType topodatapb.TabletType, sendReply func(*sqltypes.Result) error) error

StreamExecute executes a streaming query by routing based on the values in the query.

func (*VTGate) StreamExecuteKeyRanges

func (vtg *VTGate) StreamExecuteKeyRanges(ctx context.Context, sql string, bindVariables map[string]interface{}, keyspace string, keyRanges []*topodatapb.KeyRange, tabletType topodatapb.TabletType, sendReply func(*sqltypes.Result) error) error

StreamExecuteKeyRanges executes a streaming query on the specified KeyRanges. The KeyRanges are resolved to shards using the serving graph. This function currently temporarily enforces the restriction of executing on one shard since it cannot merge-sort the results to guarantee ordering of response which is needed for checkpointing. The api supports supplying multiple keyranges to make it future proof.

func (*VTGate) StreamExecuteKeyspaceIds

func (vtg *VTGate) StreamExecuteKeyspaceIds(ctx context.Context, sql string, bindVariables map[string]interface{}, keyspace string, keyspaceIds [][]byte, tabletType topodatapb.TabletType, sendReply func(*sqltypes.Result) error) error

StreamExecuteKeyspaceIds executes a streaming query on the specified KeyspaceIds. The KeyspaceIds are resolved to shards using the serving graph. This function currently temporarily enforces the restriction of executing on one shard since it cannot merge-sort the results to guarantee ordering of response which is needed for checkpointing. The api supports supplying multiple KeyspaceIds to make it future proof.

func (*VTGate) StreamExecuteShards

func (vtg *VTGate) StreamExecuteShards(ctx context.Context, sql string, bindVariables map[string]interface{}, keyspace string, shards []string, tabletType topodatapb.TabletType, sendReply func(*sqltypes.Result) error) error

StreamExecuteShards executes a streaming query on the specified shards.

Directories

Path Synopsis
Package fakerpcvtgateconn provides a fake implementation of vtgateconn.Impl that doesn't do any RPC, but uses a local map to return results.
Package fakerpcvtgateconn provides a fake implementation of vtgateconn.Impl that doesn't do any RPC, but uses a local map to return results.
Package grpcvtgateconn provides gRPC connectivity for VTGate.
Package grpcvtgateconn provides gRPC connectivity for VTGate.
Package grpcvtgateservice provides the gRPC glue for vtgate
Package grpcvtgateservice provides the gRPC glue for vtgate
Package masterbuffer contains experimental logic to buffer master requests in VTGate.
Package masterbuffer contains experimental logic to buffer master requests in VTGate.
Package planbuilder allows you to build execution plans that describe how to fulfill a query that may span multiple keyspaces or shards.
Package planbuilder allows you to build execution plans that describe how to fulfill a query that may span multiple keyspaces or shards.
Package vtgateconntest provides the test methods to make sure a vtgateconn/vtgateservice pair over RPC works correctly.
Package vtgateconntest provides the test methods to make sure a vtgateconn/vtgateservice pair over RPC works correctly.
Package vtgateservice provides to interface definition for the vtgate service
Package vtgateservice provides to interface definition for the vtgate service

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