vreplication

package
v0.10.5 Latest Latest
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Published: Jan 10, 2022 License: Apache-2.0 Imports: 47 Imported by: 2

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Index

Constants

View Source
const ExcludeStr = "exclude"

ExcludeStr is the filter value for excluding tables that match a rule. TODO(sougou): support this on vstreamer side also.

Variables

This section is empty.

Functions

func AddStatusPart

func AddStatusPart()

AddStatusPart adds the vreplication status to the status page.

func MatchTable

func MatchTable(tableName string, filter *binlogdatapb.Filter) (*binlogdatapb.Rule, error)

MatchTable is similar to tableMatches and buildPlan defined in vstreamer/planbuilder.go.

func NewReplicaConnector

func NewReplicaConnector(connParams *mysql.ConnParams) *replicaConnector

NewReplicaConnector returns replica connector

This is used by binlog server to make vstream connection using the vstream connection, it will parse the events from binglog to fetch the corresponding GTID for required recovery time

func StatusSummary

func StatusSummary() (maxSecondsBehindMaster int64, binlogPlayersCount int32)

StatusSummary returns the summary status of vreplication.

Types

type ControllerStatus

type ControllerStatus struct {
	Index               uint32
	Source              string
	SourceShard         string
	StopPosition        string
	LastPosition        string
	Heartbeat           int64
	SecondsBehindMaster int64
	Counts              map[string]int64
	Rates               map[string][]float64
	State               string
	SourceTablet        string
	Messages            []string
	QueryCounts         map[string]int64
	PhaseTimings        map[string]int64
	CopyRowCount        int64
	CopyLoopCount       int64
}

ControllerStatus contains a renderable status of a controller.

type Engine

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

Engine is the engine for handling vreplication.

func NewEngine

func NewEngine(config *tabletenv.TabletConfig, ts *topo.Server, cell string, mysqld mysqlctl.MysqlDaemon, lagThrottler *throttle.Throttler) *Engine

NewEngine creates a new Engine. A nil ts means that the Engine is disabled.

func NewTestEngine

func NewTestEngine(ts *topo.Server, cell string, mysqld mysqlctl.MysqlDaemon, dbClientFactory func() binlogplayer.DBClient, dbname string, externalConfig map[string]*dbconfigs.DBConfigs) *Engine

NewTestEngine creates a new Engine for testing.

func (*Engine) Close

func (vre *Engine) Close()

Close closes the Engine service.

func (*Engine) Exec

func (vre *Engine) Exec(query string) (*sqltypes.Result, error)

Exec executes the query and the related actions. Example insert statement: insert into _vt.vreplication

(workflow, source, pos, max_tps, max_replication_lag, time_updated, transaction_timestamp, state)
values ('Resharding', 'keyspace:"ks" shard:"0" tables:"a" tables:"b" ', 'MariaDB/0-1-1083', 9223372036854775807, 9223372036854775807, 481823, 0, 'Running')`

Example update statement: update _vt.vreplication set state='Stopped', message='testing stop' where id=1 Example delete: delete from _vt.vreplication where id=1 Example select: select * from _vt.vreplication

func (*Engine) InitDBConfig

func (vre *Engine) InitDBConfig(dbcfgs *dbconfigs.DBConfigs)

InitDBConfig should be invoked after the db name is computed.

func (*Engine) IsOpen

func (vre *Engine) IsOpen() bool

IsOpen returns true if Engine is open.

func (*Engine) Open

func (vre *Engine) Open(ctx context.Context)

Open starts the Engine service.

func (*Engine) WaitForPos

func (vre *Engine) WaitForPos(ctx context.Context, id int, pos string) error

WaitForPos waits for the replication to reach the specified position.

type EngineStatus

type EngineStatus struct {
	IsOpen      bool
	Controllers []*ControllerStatus
}

EngineStatus contains a renderable status of the Engine.

type HTTPStreamWriterMock

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

HTTPStreamWriterMock implements http.ResponseWriter and adds a channel to sync writes and reads

func NewHTTPStreamWriterMock

func NewHTTPStreamWriterMock() *HTTPStreamWriterMock

NewHTTPStreamWriterMock returns a new HTTPStreamWriterMock

func (*HTTPStreamWriterMock) Flush

func (w *HTTPStreamWriterMock) Flush()

Flush sends buffered data to the channel

func (*HTTPStreamWriterMock) Header

func (w *HTTPStreamWriterMock) Header() http.Header

Header is a stub

func (*HTTPStreamWriterMock) Write

func (w *HTTPStreamWriterMock) Write(data []byte) (int, error)

Write buffers sent data

func (*HTTPStreamWriterMock) WriteHeader

func (w *HTTPStreamWriterMock) WriteHeader(statuscode int)

WriteHeader is a stub

type InsertGenerator

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

InsertGenerator generates a vreplication insert statement.

func NewInsertGenerator

func NewInsertGenerator(state, dbname string) *InsertGenerator

NewInsertGenerator creates a new InsertGenerator.

func (*InsertGenerator) AddRow

func (ig *InsertGenerator) AddRow(workflow string, bls *binlogdatapb.BinlogSource, pos, cell, tabletTypes string)

AddRow adds a row to the insert statement.

func (*InsertGenerator) String

func (ig *InsertGenerator) String() string

String returns the generated statement.

type PrimaryKeyInfo added in v0.8.0

type PrimaryKeyInfo struct {
	Name       string
	CharSet    string
	Collation  string
	DataType   string
	ColumnType string
}

PrimaryKeyInfo is used to store charset and collation for primary keys where applicable

type ReplicatorPlan

type ReplicatorPlan struct {
	VStreamFilter *binlogdatapb.Filter
	TargetTables  map[string]*TablePlan
	TablePlans    map[string]*TablePlan
	PKInfoMap     map[string][]*PrimaryKeyInfo
}

ReplicatorPlan is the execution plan for the replicator. It contains plans for all the tables it's replicating. Every phase of vreplication builds its own instance of the ReplicatorPlan. This is because the plan depends on copyState, which changes on every iteration. The table plans within ReplicatorPlan will not be fully populated because all the information is not available initially. For simplicity, the ReplicatorPlan is immutable. Once we get the field info for a table from the stream response, we'll have all the necessary info to build the final plan. At that time, buildExecutionPlan is invoked, which will make a copy of the TablePlan from ReplicatorPlan, and fill the rest of the members, leaving the original plan unchanged. The constructor is buildReplicatorPlan in table_plan_builder.go

func (*ReplicatorPlan) MarshalJSON

func (rp *ReplicatorPlan) MarshalJSON() ([]byte, error)

MarshalJSON performs a custom JSON Marshalling.

type ShardSorter

type ShardSorter []string

ShardSorter implements a sort.Sort() function for sorting shard ranges

func (ShardSorter) Key

func (s ShardSorter) Key(ind int) string

Key returns the prefix of a shard range

func (ShardSorter) Len

func (s ShardSorter) Len() int

Len implements the required interface for a sorting function

func (ShardSorter) Less

func (s ShardSorter) Less(i, j int) bool

Less implements the required interface for a sorting function

func (ShardSorter) Swap

func (s ShardSorter) Swap(i, j int)

Swap implements the required interface for a sorting function

type TablePlan

type TablePlan struct {
	// TargetName, SendRule will always be initialized.
	TargetName string
	SendRule   *binlogdatapb.Rule
	// Lastpk will be initialized if it was specified, and
	// will be used for building the final plan after field info
	// is received.
	Lastpk *sqltypes.Result
	// BulkInsertFront, BulkInsertValues and BulkInsertOnDup are used
	// by vcopier. These three parts are combined to build bulk insert
	// statements. This is functionally equivalent to generating
	// multiple statements using the "Insert" construct, but much more
	// efficient for the copy phase.
	BulkInsertFront  *sqlparser.ParsedQuery
	BulkInsertValues *sqlparser.ParsedQuery
	BulkInsertOnDup  *sqlparser.ParsedQuery
	// Insert, Update and Delete are used by vplayer.
	// If the plan is an insertIgnore type, then Insert
	// and Update contain 'insert ignore' statements and
	// Delete is nil.
	Insert *sqlparser.ParsedQuery
	Update *sqlparser.ParsedQuery
	Delete *sqlparser.ParsedQuery
	Fields []*querypb.Field
	// PKReferences is used to check if an event changed
	// a primary key column (row move).
	PKReferences []string
}

TablePlan is the execution plan for a table within a replicator. If the column names are not known at the time of plan building (like select *), then only TargetName, SendRule and Lastpk are initialized. When the stream returns the field info, those are used as column names to build the final plan. Lastpk comes from copyState. If it's set, then the generated plans are significantly different because any events that fall beyond Lastpk must be excluded. If column names were known upfront, then all fields of TablePlan are built except for Fields. This member is populated only after the field info is received from the stream. The ParsedQuery objects assume that a map of before and after values will be built based on the streaming rows. Before image values will be prefixed with a "b_", and after image values will be prefixed with a "a_". The TablePlan structure is used during all the phases of vreplication: catchup, copy, fastforward, or regular replication.

func (*TablePlan) MarshalJSON

func (tp *TablePlan) MarshalJSON() ([]byte, error)

MarshalJSON performs a custom JSON Marshalling.

type VStreamerClient

type VStreamerClient interface {
	Open(context.Context) error
	Close(context.Context) error

	// VStream streams VReplication events based on the specified filter.
	VStream(ctx context.Context, startPos string, tablePKs []*binlogdatapb.TableLastPK, filter *binlogdatapb.Filter, send func([]*binlogdatapb.VEvent) error) error

	// VStreamRows streams rows of a table from the specified starting point.
	VStreamRows(ctx context.Context, query string, lastpk *querypb.QueryResult, send func(*binlogdatapb.VStreamRowsResponse) error) error
}

VStreamerClient exposes the core interface of a vstreamer

type VrLogStats

type VrLogStats struct {
	Type       string
	Detail     string
	StartTime  time.Time
	LogTime    string
	DurationNs int64
}

VrLogStats collects attributes of a vreplication event for logging

func NewVrLogStats

func NewVrLogStats(eventType string) *VrLogStats

NewVrLogStats should be called at the start of the event to be logged

func (*VrLogStats) Send

func (stats *VrLogStats) Send(detail string)

Send records the log event, should be called on a stats object constructed by NewVrLogStats()

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