meta

package
v1.1.0-beta.0...-14a469a Latest Latest
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 Go to latest Published: Dec 23, 2024 License: Apache-2.0 Imports: 26 Imported by: 0

Documentation

Index

Constants

View Source 
const (
	// CurrentMagicByteVer is the current magic byte version, used for future meta compatibility.
	CurrentMagicByteVer byte = 0x00

	// MaxInt48 is the max value of int48.
	MaxInt48 = 0x0000FFFFFFFFFFFF
	// MaxGlobalID reserves 1000 IDs. Use MaxInt48 to reserves the high 2 bytes to compatible with Multi-tenancy.
	MaxGlobalID = MaxInt48 - 1000
)
View Source 
const NameExtractRegexp = `"O":"([^"\\]*(?:\\.[^"\\]*)*)",`

NameExtractRegexp is exported for testing.

Variables

View Source 
var (
	// ErrDBExists is the error for db exists.
	ErrDBExists = dbterror.ClassMeta.NewStd(mysql.ErrDBCreateExists)
	// ErrDBNotExists is the error for db not exists.
	ErrDBNotExists = dbterror.ClassMeta.NewStd(mysql.ErrBadDB)
	// ErrPolicyExists is the error for policy exists.
	ErrPolicyExists = dbterror.ClassMeta.NewStd(errno.ErrPlacementPolicyExists)
	// ErrPolicyNotExists is the error for policy not exists.
	ErrPolicyNotExists = dbterror.ClassMeta.NewStd(errno.ErrPlacementPolicyNotExists)
	// ErrResourceGroupExists is the error for resource group exists.
	ErrResourceGroupExists = dbterror.ClassMeta.NewStd(errno.ErrResourceGroupExists)
	// ErrResourceGroupNotExists is the error for resource group not exists.
	ErrResourceGroupNotExists = dbterror.ClassMeta.NewStd(errno.ErrResourceGroupNotExists)
	// ErrTableExists is the error for table exists.
	ErrTableExists = dbterror.ClassMeta.NewStd(mysql.ErrTableExists)
	// ErrTableNotExists is the error for table not exists.
	ErrTableNotExists = dbterror.ClassMeta.NewStd(mysql.ErrNoSuchTable)
	// ErrDDLReorgElementNotExist is the error for reorg element not exists.
	ErrDDLReorgElementNotExist = dbterror.ClassMeta.NewStd(errno.ErrDDLReorgElementNotExist)
	// ErrInvalidString is the error for invalid string to parse
	ErrInvalidString = dbterror.ClassMeta.NewStd(errno.ErrInvalidCharacterString)
)

Functions

func AutoIncrementIDKey 

func AutoIncrementIDKey(tableID int64) []byte

AutoIncrementIDKey decodes the auto inc table key.

func AutoRandomTableIDKey 

func AutoRandomTableIDKey(tableID int64) []byte

AutoRandomTableIDKey encodes the auto random tableID key.

func AutoTableIDKey 

func AutoTableIDKey(tableID int64) []byte

AutoTableIDKey decodes the auto tableID key.

func DBkey 

func DBkey(dbID int64) []byte

DBkey encodes the dbID into dbKey.

func DDLJobHistoryKey 

func DDLJobHistoryKey(m *Mutator, jobID int64) []byte

DDLJobHistoryKey is only used for testing.

func DefaultGroupMeta4Test 

func DefaultGroupMeta4Test() *model.ResourceGroupInfo

DefaultGroupMeta4Test return the default group info for test usage.

func ExtractSchemaAndTableNameFromJob 

func ExtractSchemaAndTableNameFromJob(data []byte) (schemaName, tableName string, err error)

ExtractSchemaAndTableNameFromJob extract schema_name and table_name from encoded Job structure Note, here we strongly rely on the order of fields in marshalled string, just like checkSubstringsInOrder Exported for test

func FastUnmarshalTableNameInfo 

func FastUnmarshalTableNameInfo(data []byte) (*model.TableNameInfo, error)

FastUnmarshalTableNameInfo is exported for testing.

func GetTableInfoWithAttributes 

func GetTableInfoWithAttributes(m *Mutator, dbID int64, filterAttrs ...string) ([]*model.TableInfo, error)

GetTableInfoWithAttributes retrieves all the table infos for a given db. The filterAttrs are used to filter out any table that is not needed.

func IsAutoIncrementIDKey 

func IsAutoIncrementIDKey(key []byte) bool

IsAutoIncrementIDKey checks whether the key is auto increment key.

func IsAutoRandomTableIDKey 

func IsAutoRandomTableIDKey(key []byte) bool

IsAutoRandomTableIDKey checks whether the key is auto random tableID key.

func IsAutoTableIDKey 

func IsAutoTableIDKey(key []byte) bool

IsAutoTableIDKey checks whether the key is auto tableID key.

func IsDBkey 

func IsDBkey(dbKey []byte) bool

IsDBkey checks whether the dbKey comes from DBKey().

func IsJobMatch 

func IsJobMatch(job []byte, schemaNames, tableNames set.StringSet) (match bool, err error)

IsJobMatch examines whether given job's table/schema name matches.

func IsSequenceKey 

func IsSequenceKey(key []byte) bool

IsSequenceKey checks whether the key is sequence key.

func IsTableInfoMustLoad 

func IsTableInfoMustLoad(json []byte) bool

IsTableInfoMustLoad checks whether the table info needs to be loaded. Exported for testing.

func IsTableKey 

func IsTableKey(tableKey []byte) bool

IsTableKey checks whether the tableKey comes from TableKey().

func ParseAutoIncrementIDKey 

func ParseAutoIncrementIDKey(key []byte) (int64, error)

ParseAutoIncrementIDKey decodes the tableID from the auto tableID key.

func ParseAutoRandomTableIDKey 

func ParseAutoRandomTableIDKey(key []byte) (int64, error)

ParseAutoRandomTableIDKey decodes the tableID from the auto random tableID key.

func ParseAutoTableIDKey 

func ParseAutoTableIDKey(key []byte) (int64, error)

ParseAutoTableIDKey decodes the tableID from the auto tableID key.

func ParseDBKey 

func ParseDBKey(dbkey []byte) (int64, error)

ParseDBKey decodes the dbkey to get dbID.

func ParseSequenceKey 

func ParseSequenceKey(key []byte) (int64, error)

ParseSequenceKey decodes the tableID from the sequence key.

func ParseTableKey 

func ParseTableKey(tableKey []byte) (int64, error)

ParseTableKey decodes the tableKey to get tableID.

func SequenceKey 

func SequenceKey(sequenceID int64) []byte

SequenceKey encodes the sequence key.

func TableKey 

func TableKey(tableID int64) []byte

TableKey encodes the tableID into tableKey.

func Unescape 

func Unescape(s string) string

Unescape is exported for testing.

Types

type AccessorPicker 

type AccessorPicker interface {
	RowID() AutoIDAccessor
	RandomID() AutoIDAccessor
	IncrementID(tableVersion uint16) AutoIDAccessor

	SequenceValue() AutoIDAccessor
	SequenceCycle() AutoIDAccessor
}

AccessorPicker is used to pick a type of auto ID accessor.

type AutoIDAccessor 

type AutoIDAccessor interface {
	Get() (int64, error)
	Put(val int64) error
	Inc(step int64) (int64, error)
	CopyTo(databaseID, tableID int64) error
	Del() error
}

AutoIDAccessor represents the entry to retrieve/mutate auto IDs.

type AutoIDAccessors 

type AutoIDAccessors interface {
	Get() (model.AutoIDGroup, error)
	Put(autoIDs model.AutoIDGroup) error
	Del() error

	AccessorPicker
}

AutoIDAccessors represents all the auto IDs of a table.

func NewAutoIDAccessors 

func NewAutoIDAccessors(m *Mutator, databaseID, tableID int64) AutoIDAccessors

NewAutoIDAccessors creates a new AutoIDAccessors.

type DDLTableVersion 

type DDLTableVersion int

DDLTableVersion is to display ddl related table versions 

const (
	// InitDDLTableVersion is the original version.
	InitDDLTableVersion DDLTableVersion = 0
	// BaseDDLTableVersion is for support concurrent DDL, it added tidb_ddl_job, tidb_ddl_reorg and tidb_ddl_history.
	BaseDDLTableVersion DDLTableVersion = 1
	// MDLTableVersion is for support MDL tables.
	MDLTableVersion DDLTableVersion = 2
	// BackfillTableVersion is for support distributed reorg stage, it added tidb_background_subtask, tidb_background_subtask_history.
	BackfillTableVersion DDLTableVersion = 3
	// DDLNotifierTableVersion is for support ddl notifier, it added tidb_ddl_notifier.
	DDLNotifierTableVersion DDLTableVersion = 4
)

func (DDLTableVersion) Bytes 

func (ver DDLTableVersion) Bytes() []byte

Bytes returns the byte slice.

type DailyRUStats 

type DailyRUStats struct {
	EndTime time.Time      `json:"date"`
	Stats   []GroupRUStats `json:"stats"`
}

DailyRUStats keeps all the ru consumption statistics data.

type Element 

type Element struct {
	ID      int64
	TypeKey []byte
}

Element has the information of the backfill job's type and ID.

func DecodeElement 

func DecodeElement(b []byte) (*Element, error)

DecodeElement decodes values from a byte slice generated with an element. It's exported for testing.

func (*Element) EncodeElement 

func (e *Element) EncodeElement() []byte

EncodeElement encodes an Element into a byte slice. It's exported for testing.

func (*Element) String 

func (e *Element) String() string

String defines a Stringer function for debugging and pretty printing.

type ElementKeyType 

type ElementKeyType []byte

ElementKeyType is a key type of the element. 

var (
	// ColumnElementKey is the key for column element.
	ColumnElementKey ElementKeyType = []byte("_col_")
	// IndexElementKey is the key for index element.
	IndexElementKey ElementKeyType = []byte("_idx_")
)

type GroupRUStats 

type GroupRUStats struct {
	ID            int64             `json:"id"`
	Name          string            `json:"name"`
	RUConsumption *rmpb.Consumption `json:"ru_consumption"`
}

GroupRUStats keeps the ru consumption statistics data.

type HLastJobIterator 

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

HLastJobIterator is the iterator for gets the latest history.

func (*HLastJobIterator) GetLastJobs 

func (i *HLastJobIterator) GetLastJobs(num int, jobs []*model.Job) ([]*model.Job, error)

GetLastJobs gets last several jobs.

type JobListKeyType 

type JobListKeyType []byte

JobListKeyType is a key type of the DDL job queue.

type LastJobIterator 

type LastJobIterator interface {
	GetLastJobs(num int, jobs []*model.Job) ([]*model.Job, error)
}

LastJobIterator is the iterator for gets latest history.

type Mutator 

type Mutator struct {
	StartTS uint64 // StartTS is the txn's start TS.
	// contains filtered or unexported fields
}

Mutator is for handling meta information in a transaction.

func NewMutator 

func NewMutator(txn kv.Transaction, options ...Option) *Mutator

NewMutator creates a meta Mutator in transaction txn. If the current Mutator needs to handle a job, jobListKey is the type of the job's list.

func (*Mutator) AddHistoryDDLJob 

func (m *Mutator) AddHistoryDDLJob(job *model.Job, updateRawArgs bool) error

AddHistoryDDLJob adds DDL job to history.

func (*Mutator) AddResourceGroup 

func (m *Mutator) AddResourceGroup(group *model.ResourceGroupInfo) error

AddResourceGroup creates a resource group.

func (*Mutator) AdvanceGlobalIDs 

func (m *Mutator) AdvanceGlobalIDs(n int) (int64, error)

AdvanceGlobalIDs advances the global ID by n. return the old global ID.

func (*Mutator) CheckDDLTableVersion 

func (m *Mutator) CheckDDLTableVersion() (DDLTableVersion, error)

CheckDDLTableVersion check if the tables related to concurrent DDL exists.

func (*Mutator) CheckTableExists 

func (m *Mutator) CheckTableExists(dbID int64, tableID int64) (bool, error)

CheckTableExists checks if the table is existed with dbID and tableID.

func (*Mutator) ClearBDRRole 

func (m *Mutator) ClearBDRRole() error

ClearBDRRole clear BDR role from storage.

func (*Mutator) CreateDatabase 

func (m *Mutator) CreateDatabase(dbInfo *model.DBInfo) error

CreateDatabase creates a database with db info.

func (*Mutator) CreateMySQLDatabaseIfNotExists 

func (m *Mutator) CreateMySQLDatabaseIfNotExists() (int64, error)

CreateMySQLDatabaseIfNotExists creates mysql schema and return its DB ID.

func (*Mutator) CreatePolicy 

func (m *Mutator) CreatePolicy(policy *model.PolicyInfo) error

CreatePolicy creates a policy.

func (*Mutator) CreateSequenceAndSetSeqValue 

func (m *Mutator) CreateSequenceAndSetSeqValue(dbID int64, tableInfo *model.TableInfo, seqValue int64) error

CreateSequenceAndSetSeqValue creates sequence with tableInfo in database, and rebase the sequence seqValue.

func (*Mutator) CreateTableAndSetAutoID 

func (m *Mutator) CreateTableAndSetAutoID(dbID int64, tableInfo *model.TableInfo, autoIDs model.AutoIDGroup) error

CreateTableAndSetAutoID creates a table with tableInfo in database, and rebases the table autoID.

func (*Mutator) CreateTableOrView 

func (m *Mutator) CreateTableOrView(dbID int64, tableInfo *model.TableInfo) error

CreateTableOrView creates a table with tableInfo in database.

func (*Mutator) DropDatabase 

func (m *Mutator) DropDatabase(dbID int64) error

DropDatabase drops whole database.

func (*Mutator) DropPolicy 

func (m *Mutator) DropPolicy(policyID int64) error

DropPolicy drops the specified policy.

func (*Mutator) DropResourceGroup 

func (m *Mutator) DropResourceGroup(groupID int64) error

DropResourceGroup drops a resource group.

func (*Mutator) DropSequence 

func (m *Mutator) DropSequence(dbID int64, tblID int64) error

DropSequence drops sequence in database. Sequence is made of table struct and kv value pair.

func (*Mutator) DropTableOrView 

func (m *Mutator) DropTableOrView(dbID int64, tblID int64) error

DropTableOrView drops table in database. If delAutoID is true, it will delete the auto_increment id key-value of the table. For rename table, we do not need to rename auto_increment id key-value.

func (*Mutator) EncodeSchemaDiffKey 

func (m *Mutator) EncodeSchemaDiffKey(schemaVersion int64) kv.Key

EncodeSchemaDiffKey returns the raw kv key for a schema diff

func (*Mutator) FinishBootstrap 

func (m *Mutator) FinishBootstrap(version int64) error

FinishBootstrap finishes bootstrap.

func (*Mutator) GenAutoTableIDKeyValue 

func (m *Mutator) GenAutoTableIDKeyValue(dbID, tableID, autoID int64) (key, value []byte)

GenAutoTableIDKeyValue generates meta key by dbID, tableID and corresponding value by autoID.

func (*Mutator) GenGlobalID 

func (m *Mutator) GenGlobalID() (int64, error)

GenGlobalID generates next id globally.

func (*Mutator) GenGlobalIDs 

func (m *Mutator) GenGlobalIDs(n int) ([]int64, error)

GenGlobalIDs generates the next n global IDs.

func (*Mutator) GenPlacementPolicyID 

func (m *Mutator) GenPlacementPolicyID() (int64, error)

GenPlacementPolicyID generates next placement policy id globally.

func (*Mutator) GenSchemaVersion 

func (m *Mutator) GenSchemaVersion() (int64, error)

GenSchemaVersion generates next schema version.

func (*Mutator) GenSchemaVersions 

func (m *Mutator) GenSchemaVersions(count int64) (int64, error)

GenSchemaVersions increases the schema version.

func (*Mutator) GetAllNameToIDAndTheMustLoadedTableInfo 

func (m *Mutator) GetAllNameToIDAndTheMustLoadedTableInfo(dbID int64) (map[string]int64, []*model.TableInfo, error)

GetAllNameToIDAndTheMustLoadedTableInfo gets all the fields and values and table info for special attributes in a hash. It's used to get some infos for information schema cache in a faster way. If a table contains any of the attributes listed in checkSubstringsInOrder, it must be loaded during schema full load. hasSpecialAttributes() is a subset of it, the difference is that: If a table need to be resident in-memory, its table info MUST be loaded. If a table info is loaded, it's NOT NECESSARILY to be keep in-memory.

func (*Mutator) GetAutoIDAccessors 

func (m *Mutator) GetAutoIDAccessors(dbID, tableID int64) AutoIDAccessors

GetAutoIDAccessors gets the controller for auto IDs.

func (*Mutator) GetBDRRole 

func (m *Mutator) GetBDRRole() (string, error)

GetBDRRole get BDR role from storage.

func (*Mutator) GetBootstrapVersion 

func (m *Mutator) GetBootstrapVersion() (int64, error)

GetBootstrapVersion returns the version of the server which bootstrap the store. If the store is not bootstraped, the version will be zero.

func (*Mutator) GetDatabase 

func (m *Mutator) GetDatabase(dbID int64) (*model.DBInfo, error)

GetDatabase gets the database value with ID.

func (*Mutator) GetGlobalID 

func (m *Mutator) GetGlobalID() (int64, error)

GetGlobalID gets current global id.

func (*Mutator) GetHistoryDDLCount 

func (m *Mutator) GetHistoryDDLCount() (uint64, error)

GetHistoryDDLCount the count of all history DDL jobs.

func (*Mutator) GetHistoryDDLJob 

func (m *Mutator) GetHistoryDDLJob(id int64) (*model.Job, error)

GetHistoryDDLJob gets a history DDL job.

func (*Mutator) GetHistoryDDLJobsIterator 

func (m *Mutator) GetHistoryDDLJobsIterator(startJobID int64) (LastJobIterator, error)

GetHistoryDDLJobsIterator gets the jobs iterator begin with startJobID.

func (*Mutator) GetLastHistoryDDLJobsIterator 

func (m *Mutator) GetLastHistoryDDLJobsIterator() (LastJobIterator, error)

GetLastHistoryDDLJobsIterator gets latest history ddl jobs iterator.

func (*Mutator) GetLastHistoryDDLJobsIteratorWithFilter 

func (m *Mutator) GetLastHistoryDDLJobsIteratorWithFilter(
	schemaNames set.StringSet,
	tableNames set.StringSet,
) (LastJobIterator, error)

GetLastHistoryDDLJobsIteratorWithFilter returns a iterator for getting latest history ddl jobs. This iterator will also filter jobs using given schemaNames and tableNames

func (*Mutator) GetMetadataLock 

func (m *Mutator) GetMetadataLock() (enable bool, isNull bool, err error)

GetMetadataLock gets the metadata lock.

func (*Mutator) GetMetasByDBID 

func (m *Mutator) GetMetasByDBID(dbID int64) ([]structure.HashPair, error)

GetMetasByDBID return all meta information of a database. Note(dongmen): This method is used by TiCDC to reduce the time of changefeed initialization. Ref: https://github.com/pingcap/tiflow/issues/11109

func (*Mutator) GetPolicy 

func (m *Mutator) GetPolicy(policyID int64) (*model.PolicyInfo, error)

GetPolicy gets the database value with ID.

func (*Mutator) GetPolicyID 

func (m *Mutator) GetPolicyID() (int64, error)

GetPolicyID gets current policy global id.

func (*Mutator) GetRUStats 

func (m *Mutator) GetRUStats() (*RUStats, error)

GetRUStats load the persisted RUStats data.

func (*Mutator) GetResourceGroup 

func (m *Mutator) GetResourceGroup(groupID int64) (*model.ResourceGroupInfo, error)

GetResourceGroup gets the database value with ID.

func (*Mutator) GetSchemaCacheSize 

func (m *Mutator) GetSchemaCacheSize() (size uint64, isNull bool, err error)

GetSchemaCacheSize gets the schema cache size.

func (*Mutator) GetSchemaDiff 

func (m *Mutator) GetSchemaDiff(schemaVersion int64) (*model.SchemaDiff, error)

GetSchemaDiff gets the modification information on a given schema version.

func (*Mutator) GetSchemaVersion 

func (m *Mutator) GetSchemaVersion() (int64, error)

GetSchemaVersion gets current global schema version.

func (*Mutator) GetSchemaVersionWithNonEmptyDiff 

func (m *Mutator) GetSchemaVersionWithNonEmptyDiff() (int64, error)

GetSchemaVersionWithNonEmptyDiff gets current global schema version, if diff is nil, we should return version - 1. Consider the following scenario:

// t1 t2 t3 t4 // | | | // update schema version | set diff // stale read ts

At the first time, t2 reads the schema version v10, but the v10's diff is not set yet, so it loads v9 infoSchema. But at t4 moment, v10's diff has been set and been cached in the memory, so stale read on t2 will get v10 schema from cache, and inconsistency happen. To solve this problem, we always check the schema diff at first, if the diff is empty, we know at t2 moment we can only see the v9 schema, so make neededSchemaVersion = neededSchemaVersion - 1. For `Reload`, we can also do this: if the newest version's diff is not set yet, it is ok to load the previous version's infoSchema, and wait for the next reload. if there are multiple consecutive jobs failed or cancelled after the schema version increased, the returned 'version - 1' might still not have diff.

func (*Mutator) GetSystemDBID 

func (m *Mutator) GetSystemDBID() (int64, error)

GetSystemDBID gets the system DB ID. return (0, nil) indicates that the system DB does not exist.

func (*Mutator) GetTable 

func (m *Mutator) GetTable(dbID int64, tableID int64) (*model.TableInfo, error)

GetTable gets the table value in database with tableID.

func (*Mutator) GlobalIDKey 

func (m *Mutator) GlobalIDKey() []byte

GlobalIDKey returns the key for the global ID.

func (*Mutator) IterTables 

func (m *Mutator) IterTables(dbID int64, fn func(info *model.TableInfo) error) error

IterTables iterates all the table at once, in order to avoid oom.

func (*Mutator) ListDatabases 

func (m *Mutator) ListDatabases() ([]*model.DBInfo, error)

ListDatabases shows all databases.

func (*Mutator) ListPolicies 

func (m *Mutator) ListPolicies() ([]*model.PolicyInfo, error)

ListPolicies shows all policies.

func (*Mutator) ListResourceGroups 

func (m *Mutator) ListResourceGroups() ([]*model.ResourceGroupInfo, error)

ListResourceGroups shows all resource groups.

func (*Mutator) ListSimpleTables 

func (m *Mutator) ListSimpleTables(dbID int64) ([]*model.TableNameInfo, error)

ListSimpleTables shows all simple tables in database.

func (*Mutator) ListTables 

func (m *Mutator) ListTables(ctx context.Context, dbID int64) ([]*model.TableInfo, error)

ListTables shows all tables in database.

func (*Mutator) RestartSequenceValue 

func (m *Mutator) RestartSequenceValue(dbID int64, tableInfo *model.TableInfo, seqValue int64) error

RestartSequenceValue resets the the sequence value.

func (*Mutator) SetBDRRole 

func (m *Mutator) SetBDRRole(role string) error

SetBDRRole write BDR role into storage.

func (*Mutator) SetDDLTables 

func (m *Mutator) SetDDLTables(ddlTableVersion DDLTableVersion) error

SetDDLTables write a key into storage.

func (*Mutator) SetMetadataLock 

func (m *Mutator) SetMetadataLock(b bool) error

SetMetadataLock sets the metadata lock.

func (*Mutator) SetRUStats 

func (m *Mutator) SetRUStats(stats *RUStats) error

SetRUStats persist new ru stats data to meta storage.

func (*Mutator) SetSchemaCacheSize 

func (m *Mutator) SetSchemaCacheSize(size uint64) error

SetSchemaCacheSize sets the schema cache size.

func (*Mutator) SetSchemaDiff 

func (m *Mutator) SetSchemaDiff(diff *model.SchemaDiff) error

SetSchemaDiff sets the modification information on a given schema version.

func (*Mutator) UpdateDatabase 

func (m *Mutator) UpdateDatabase(dbInfo *model.DBInfo) error

UpdateDatabase updates a database with db info.

func (*Mutator) UpdatePolicy 

func (m *Mutator) UpdatePolicy(policy *model.PolicyInfo) error

UpdatePolicy updates a policy.

func (*Mutator) UpdateResourceGroup 

func (m *Mutator) UpdateResourceGroup(group *model.ResourceGroupInfo) error

UpdateResourceGroup updates a resource group.

func (*Mutator) UpdateTable 

func (m *Mutator) UpdateTable(dbID int64, tableInfo *model.TableInfo) error

UpdateTable updates the table with table info.

type Option 

type Option func(m *Mutator)

Option is for Mutator option.

type RUStats 

type RUStats struct {
	Latest   *DailyRUStats `json:"latest"`
	Previous *DailyRUStats `json:"previous"`
}

RUStats keeps the lastest and second lastest DailyRUStats data.

type Reader 

type Reader interface {
	GetDatabase(dbID int64) (*model.DBInfo, error)
	ListDatabases() ([]*model.DBInfo, error)
	GetTable(dbID int64, tableID int64) (*model.TableInfo, error)
	ListTables(ctx context.Context, dbID int64) ([]*model.TableInfo, error)
	ListSimpleTables(dbID int64) ([]*model.TableNameInfo, error)
	IterTables(dbID int64, fn func(info *model.TableInfo) error) error
	GetAutoIDAccessors(dbID, tableID int64) AutoIDAccessors
	GetAllNameToIDAndTheMustLoadedTableInfo(dbID int64) (map[string]int64, []*model.TableInfo, error)

	GetMetadataLock() (enable bool, isNull bool, err error)
	GetHistoryDDLJob(id int64) (*model.Job, error)
	GetHistoryDDLCount() (uint64, error)
	GetLastHistoryDDLJobsIterator() (LastJobIterator, error)
	GetHistoryDDLJobsIterator(startJobID int64) (LastJobIterator, error)

	GetSchemaVersion() (int64, error)
	EncodeSchemaDiffKey(schemaVersion int64) kv.Key
	GetSchemaDiff(schemaVersion int64) (*model.SchemaDiff, error)
	GetSchemaVersionWithNonEmptyDiff() (int64, error)

	GetPolicyID() (int64, error)
	GetPolicy(policyID int64) (*model.PolicyInfo, error)
	ListPolicies() ([]*model.PolicyInfo, error)

	GetRUStats() (*RUStats, error)
	GetResourceGroup(groupID int64) (*model.ResourceGroupInfo, error)
	ListResourceGroups() ([]*model.ResourceGroupInfo, error)

	GetMetasByDBID(dbID int64) ([]structure.HashPair, error)
	GetGlobalID() (int64, error)
	GetBDRRole() (string, error)
	GetSystemDBID() (int64, error)
	GetSchemaCacheSize() (size uint64, isNull bool, err error)
	GetBootstrapVersion() (int64, error)
}

Reader is the meta reader

func NewReader 

func NewReader(snapshot kv.Snapshot) Reader

NewReader creates a meta Reader in snapshot.

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