schema

package
v0.17.1 Latest Latest
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 Go to latest Published: Jul 28, 2023 License: Apache-2.0 Imports: 15 Imported by: 0

Documentation

Index

Constants

View Source 
const (
	SchemaMigrationsTableName = "schema_migrations"
	RevertActionStr           = "revert"
)
View Source 
const (
	GCTableNameExpression string = `^_vt_(HOLD|PURGE|EVAC|DROP)_([0-f]{32})_([0-9]{14})$`
)

Variables

View Source 
var (
	// ErrDirectDDLDisabled is returned when direct DDL is disabled, and a user attempts to run a DDL statement
	ErrDirectDDLDisabled = errors.New("direct DDL is disabled")
	// ErrOnlineDDLDisabled is returned when online DDL is disabled, and a user attempts to run an online DDL operation (submit, review, control)
	ErrOnlineDDLDisabled = errors.New("online DDL is disabled")
	// ErrForeignKeyFound indicates any finding of FOREIGN KEY clause in a DDL statement
	ErrForeignKeyFound = errors.New("Foreign key found")
	// ErrRenameTableFound indicates finding of ALTER TABLE...RENAME in ddl statement
	ErrRenameTableFound = errors.New("RENAME clause found")
)

Functions

func CreateOnlineDDLUUID added in v0.11.0 

func CreateOnlineDDLUUID() (string, error)

CreateOnlineDDLUUID creates a UUID in OnlineDDL format, e.g.: a0638f6b_ec7b_11ea_9bf8_000d3a9b8a9a

func CreateUUID 

func CreateUUID() (string, error)

CreateUUID creates a globally unique ID example result "1876a01a-354d-11eb-9a79-f8e4e33000bb"

func CreateUUIDWithDelimiter added in v0.14.0 

func CreateUUIDWithDelimiter(delimiter string) (string, error)

CreateUUIDWithDelimiter creates a globally unique ID, with a given delimiter example results: - 1876a01a-354d-11eb-9a79-f8e4e33000bb (delimiter = "-") - 7cee19dd_354b_11eb_82cd_f875a4d24e90 (delimiter = "_") - 55d00cdce6ab11eabfe60242ac1c000d (delimiter = "")

func GenerateGCTableName added in v0.10.0 

func GenerateGCTableName(state TableGCState, t time.Time) (tableName string, err error)

GenerateGCTableName creates a GC table name, based on desired state and time, and with random UUID

func GenerateRenameStatement 

func GenerateRenameStatement(fromTableName string, state TableGCState, t time.Time) (statement string, toTableName string, err error)

GenerateRenameStatement generates a "RENAME TABLE" statement, where a table is renamed to a GC table.

func GenerateRenameStatementWithUUID added in v0.9.0 

func GenerateRenameStatementWithUUID(fromTableName string, state TableGCState, uuid string, t time.Time) (statement string, toTableName string, err error)

GenerateRenameStatementWithUUID generates a "RENAME TABLE" statement, where a table is renamed to a GC table, with preset UUID

func IsGCTableName 

func IsGCTableName(tableName string) bool

IsGCTableName answers 'true' when the given table name stands for a GC table

func IsGCUUID added in v0.9.0 

func IsGCUUID(uuid string) bool

IsGCUUID answers 'true' when the given string is an GC UUID, e.g.: a0638f6bec7b11ea9bf8000d3a9b8a9a

func IsInternalOperationTableName added in v0.9.0 

func IsInternalOperationTableName(tableName string) bool

IsInternalOperationTableName answers 'true' when the given table name stands for an internal Vitess table used for operations such as: - Online DDL (gh-ost, pt-online-schema-change) - Table GC (renamed before drop) Apps such as VStreamer may choose to ignore such tables.

func IsOnlineDDLTableName added in v0.9.0 

func IsOnlineDDLTableName(tableName string) bool

IsOnlineDDLTableName answers 'true' when the given table name _appears to be_ a name generated by an online DDL operation; either the name determined by the online DDL Executor, or by pt-online-schema-change. There is no guarantee that the tables _was indeed_ generated by an online DDL flow.

func IsOnlineDDLUUID 

func IsOnlineDDLUUID(uuid string) bool

IsOnlineDDLUUID answers 'true' when the given string is an online-ddl UUID, e.g.: a0638f6b_ec7b_11ea_9bf8_000d3a9b8a9a

func OnlineDDLToGCUUID added in v0.9.0 

func OnlineDDLToGCUUID(uuid string) string

OnlineDDLToGCUUID converts a UUID in online-ddl format to GC-table format

func ParseAlterTableOptions 

func ParseAlterTableOptions(alterStatement string) (explicitSchema, explicitTable, alterOptions string)

ParseAlterTableOptions parses a ALTER ... TABLE... statement into: - explicit schema and table, if available - alter options (anything that follows ALTER ... TABLE)

func ParseEnumOrSetTokensMap added in v0.13.0 

func ParseEnumOrSetTokensMap(enumOrSetValues string) map[string]string

ParseEnumOrSetTokensMap parses the comma delimited part of an enum column definition and returns a map where ["1"] is the first token, and ["<n>"] is th elast token

func ParseEnumValues added in v0.11.0 

func ParseEnumValues(enumColumnType string) string

ParseEnumValues parses the comma delimited part of an enum column definition

func ParseGCLifecycle 

func ParseGCLifecycle(gcLifecycle string) (states map[TableGCState]bool, err error)

ParseGCLifecycle parses a comma separated list of gc states and returns a map of indicated states

func ParseOnlineDDLStatement added in v0.9.0 

func ParseOnlineDDLStatement(sql string) (ddlStmt sqlparser.DDLStatement, action sqlparser.DDLAction, err error)

ParseOnlineDDLStatement parses the given SQL into a statement and returns the action type of the DDL statement, or error if the statement is not a DDL

func ParseSetValues added in v0.13.0 

func ParseSetValues(setColumnType string) string

ParseSetValues parses the comma delimited part of a set column definition

func ToReadableTimestamp 

func ToReadableTimestamp(t time.Time) string

ToReadableTimestamp returns a timestamp, in seconds resolution, that is human readable (as opposed to unix timestamp which is just a number) Example: for Aug 25 2020, 16:04:25 we return "20200825160425"

Types

type DDLStrategy added in v0.9.0 

type DDLStrategy string

DDLStrategy suggests how an ALTER TABLE should run (e.g. "direct", "online", "gh-ost" or "pt-osc") 

const (
	// DDLStrategyDirect means not an online-ddl migration; unmanaged. Just a normal MySQL `ALTER TABLE`
	DDLStrategyDirect DDLStrategy = "direct"
	// DDLStrategyVitess requests vreplication to run the migration; new name for DDLStrategyOnline
	DDLStrategyVitess DDLStrategy = "vitess"
	// DDLStrategyOnline requests vreplication to run the migration
	DDLStrategyOnline DDLStrategy = "online"
	// DDLStrategyGhost requests gh-ost to run the migration
	DDLStrategyGhost DDLStrategy = "gh-ost"
	// DDLStrategyPTOSC requests pt-online-schema-change to run the migration
	DDLStrategyPTOSC DDLStrategy = "pt-osc"
	// DDLStrategyMySQL is a managed migration (queued and executed by the scheduler) but runs through a MySQL `ALTER TABLE`
	DDLStrategyMySQL DDLStrategy = "mysql"
)

func (DDLStrategy) IsDirect added in v0.9.0 

func (s DDLStrategy) IsDirect() bool

IsDirect returns true if this strategy is a direct strategy A strategy is direct if it's not explciitly one of the online DDL strategies

type DDLStrategySetting added in v0.11.0 

type DDLStrategySetting struct {
	Strategy DDLStrategy `json:"strategy,omitempty"`
	Options  string      `json:"options,omitempty"`
}

DDLStrategySetting is a formal breakdown of the @@ddl_strategy variable, into strategy and options

func NewDDLStrategySetting added in v0.11.0 

func NewDDLStrategySetting(strategy DDLStrategy, options string) *DDLStrategySetting

NewDDLStrategySetting instantiates a new setting

func ParseDDLStrategy added in v0.9.0 

func ParseDDLStrategy(strategyVariable string) (*DDLStrategySetting, error)

ParseDDLStrategy parses and validates the value of @@ddl_strategy or -ddl_strategy variables

func (*DDLStrategySetting) CachedSize added in v0.11.0 

func (cached *DDLStrategySetting) CachedSize(alloc bool) int64

func (*DDLStrategySetting) CutOverThreshold added in v0.17.0 

func (setting *DDLStrategySetting) CutOverThreshold() (d time.Duration, err error)

CutOverThreshold returns a list of shards specified in '--shards=...', or an empty slice if unspecified

func (*DDLStrategySetting) IsAllowConcurrent added in v0.13.0 

func (setting *DDLStrategySetting) IsAllowConcurrent() bool

IsAllowConcurrent checks if strategy options include --allow-concurrent

func (*DDLStrategySetting) IsAllowForeignKeysFlag added in v0.16.0 

func (setting *DDLStrategySetting) IsAllowForeignKeysFlag() bool

IsAllowForeignKeysFlag checks if strategy options include --unsafe-allow-foreign-keys

func (*DDLStrategySetting) IsAllowZeroInDateFlag added in v0.13.0 

func (setting *DDLStrategySetting) IsAllowZeroInDateFlag() bool

IsAllowZeroInDateFlag checks if strategy options include --allow-zero-in-date

func (*DDLStrategySetting) IsDeclarative added in v0.11.0 

func (setting *DDLStrategySetting) IsDeclarative() bool

IsDeclarative checks if strategy options include --declarative

func (*DDLStrategySetting) IsFastRangeRotationFlag added in v0.14.0 

func (setting *DDLStrategySetting) IsFastRangeRotationFlag() bool

IsFastRangeRotationFlag checks if strategy options include --fast-range-rotation

func (*DDLStrategySetting) IsInOrderCompletion added in v0.16.0 

func (setting *DDLStrategySetting) IsInOrderCompletion() bool

IsInOrderCompletion checks if strategy options include --in-order-completion

func (*DDLStrategySetting) IsPostponeCompletion added in v0.13.0 

func (setting *DDLStrategySetting) IsPostponeCompletion() bool

IsPostponeCompletion checks if strategy options include --postpone-completion

func (*DDLStrategySetting) IsPostponeLaunch added in v0.15.0 

func (setting *DDLStrategySetting) IsPostponeLaunch() bool

IsPostponeLaunch checks if strategy options include --postpone-launch

func (*DDLStrategySetting) IsPreferInstantDDL added in v0.16.0 

func (setting *DDLStrategySetting) IsPreferInstantDDL() bool

IsPreferInstantDDL checks if strategy options include --prefer-instant-ddl

func (*DDLStrategySetting) IsSingleton added in v0.11.0 

func (setting *DDLStrategySetting) IsSingleton() bool

IsSingleton checks if strategy options include --singleton

func (*DDLStrategySetting) IsSingletonContext added in v0.11.0 

func (setting *DDLStrategySetting) IsSingletonContext() bool

IsSingletonContext checks if strategy options include --singleton-context

func (*DDLStrategySetting) IsVreplicationTestSuite added in v0.11.0 

func (setting *DDLStrategySetting) IsVreplicationTestSuite() bool

IsVreplicationTestSuite checks if strategy options include --vreplicatoin-test-suite

func (*DDLStrategySetting) RuntimeOptions added in v0.11.0 

func (setting *DDLStrategySetting) RuntimeOptions() []string

RuntimeOptions returns the options used as runtime flags for given strategy, removing any internal hint options

func (*DDLStrategySetting) ToString added in v0.11.0 

func (setting *DDLStrategySetting) ToString() string

ToString returns a simple string representation of this instance

type NormalizedDDLQuery added in v0.9.0 

type NormalizedDDLQuery struct {
	SQL       string
	TableName sqlparser.TableName
}

NormalizedDDLQuery contains a query which is online-ddl -normalized

type OnlineDDL 

type OnlineDDL struct {
	Keyspace string      `json:"keyspace,omitempty"`
	Table    string      `json:"table,omitempty"`
	Schema   string      `json:"schema,omitempty"`
	SQL      string      `json:"sql,omitempty"`
	UUID     string      `json:"uuid,omitempty"`
	Strategy DDLStrategy `json:"strategy,omitempty"`
	Options  string      `json:"options,omitempty"`
	// Stateful fields:
	MigrationContext   string          `json:"context,omitempty"`
	Status             OnlineDDLStatus `json:"status,omitempty"`
	TabletAlias        string          `json:"tablet,omitempty"`
	Retries            int64           `json:"retries,omitempty"`
	ReadyToComplete    int64           `json:"ready_to_complete,omitempty"`
	WasReadyToComplete int64           `json:"was_ready_to_complete,omitempty"`
}

OnlineDDL encapsulates the relevant information in an online schema change request

func FromJSON 

func FromJSON(bytes []byte) (*OnlineDDL, error)

FromJSON creates an OnlineDDL from json

func NewOnlineDDL 

func NewOnlineDDL(keyspace string, table string, sql string, ddlStrategySetting *DDLStrategySetting, migrationContext string, providedUUID string) (onlineDDL *OnlineDDL, err error)

NewOnlineDDL creates a schema change request with self generated UUID and RequestTime

func NewOnlineDDLs added in v0.11.0 

func NewOnlineDDLs(keyspace string, sql string, ddlStmt sqlparser.DDLStatement, ddlStrategySetting *DDLStrategySetting, migrationContext string, providedUUID string) (onlineDDLs [](*OnlineDDL), err error)

NewOnlineDDLs takes a single DDL statement, normalizes it (potentially break down into multiple statements), and generates one or more OnlineDDL instances, one for each normalized statement

func OnlineDDLFromCommentedStatement added in v0.11.0 

func OnlineDDLFromCommentedStatement(stmt sqlparser.Statement) (onlineDDL *OnlineDDL, err error)

OnlineDDLFromCommentedStatement creates a schema instance based on a commented query. The query is expected to be commented as e.g. `CREATE /*vt+ uuid=... context=... table=... strategy=... options=... */ TABLE ...`

func (*OnlineDDL) GetAction added in v0.9.0 

func (onlineDDL *OnlineDDL) GetAction() (action sqlparser.DDLAction, err error)

GetAction extracts the DDL action type from the online DDL statement

func (*OnlineDDL) GetActionStr added in v0.9.0 

func (onlineDDL *OnlineDDL) GetActionStr() (action sqlparser.DDLAction, actionStr string, err error)

GetActionStr returns a string representation of the DDL action

func (*OnlineDDL) GetGCUUID added in v0.9.0 

func (onlineDDL *OnlineDDL) GetGCUUID() string

GetGCUUID gets this OnlineDDL UUID in GC UUID format

func (*OnlineDDL) GetRevertUUID added in v0.10.0 

func (onlineDDL *OnlineDDL) GetRevertUUID() (uuid string, err error)

GetRevertUUID works when this migration is a revert for another migration. It returns the UUID fo the reverted migration. The function returns error when this is not a revert migration.

func (*OnlineDDL) IsView added in v0.14.0 

func (onlineDDL *OnlineDDL) IsView() bool

IsView returns 'true' when the statement affects a VIEW

func (*OnlineDDL) StrategySetting added in v0.11.0 

func (onlineDDL *OnlineDDL) StrategySetting() *DDLStrategySetting

StrategySetting returns the ddl strategy setting associated with this online DDL

func (*OnlineDDL) ToJSON 

func (onlineDDL *OnlineDDL) ToJSON() ([]byte, error)

ToJSON exports this onlineDDL to JSON

func (*OnlineDDL) ToString 

func (onlineDDL *OnlineDDL) ToString() string

ToString returns a simple string representation of this instance

type OnlineDDLStatus 

type OnlineDDLStatus string

OnlineDDLStatus is an indicator to a online DDL status 

const (
	OnlineDDLStatusRequested OnlineDDLStatus = "requested"
	OnlineDDLStatusCancelled OnlineDDLStatus = "cancelled"
	OnlineDDLStatusQueued    OnlineDDLStatus = "queued"
	OnlineDDLStatusReady     OnlineDDLStatus = "ready"
	OnlineDDLStatusRunning   OnlineDDLStatus = "running"
	OnlineDDLStatusComplete  OnlineDDLStatus = "complete"
	OnlineDDLStatusFailed    OnlineDDLStatus = "failed"
)

type TableGCState 

type TableGCState string

TableGCState provides a state for the type of GC table: HOLD? PURGE? EVAC? DROP? See details below 

const (
	// HoldTableGCState is the state where table was just renamed away. Data is still in tact,
	// and the user has the option to rename it back. A "safety" period.
	HoldTableGCState TableGCState = "HOLD"
	// PurgeTableGCState is the state where we purge table data. Table in this state is "lost" to the user.
	// if in this state, the table will be fully purged.
	PurgeTableGCState TableGCState = "PURGE"
	// EvacTableGCState is a waiting state, where we merely wait out the table's pages to be
	// gone from InnoDB's buffer pool, adaptive hash index cache, and whatnot.
	EvacTableGCState TableGCState = "EVAC"
	// DropTableGCState is the state where the table is to be dropped. Probably ASAP
	DropTableGCState TableGCState = "DROP"
	// TableDroppedGCState is a pseudo state; a hint that the table does not exists anymore
	TableDroppedGCState TableGCState = ""
)

func AnalyzeGCTableName 

func AnalyzeGCTableName(tableName string) (isGCTable bool, state TableGCState, uuid string, t time.Time, err error)

AnalyzeGCTableName analyzes a given table name to see if it's a GC table, and if so, parse out its state, uuid, and timestamp

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