mysqlctl

package
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 Go to latest Published: Jan 17, 2023 License: Apache-2.0 Imports: 43 Imported by: 0

Documentation

Index

Constants

This section is empty.

Variables

View Source 
var (
	// ErrNoBackup is returned when there is no backup.
	ErrNoBackup = errors.New("no available backup")

	// ErrExistingDB is returned when there's already an active DB.
	ErrExistingDB = errors.New("skipping restore due to existing database")
)
View Source 
var (
	// DisableActiveReparents is a flag to disable active
	// reparents for safety reasons. It is used in three places:
	// 1. in this file to skip registering the commands.
	// 2. in vtctld so it can be exported to the UI (different
	// package, that's why it's exported). That way we can disable
	// menu items there, using features.
	// 3. prevents the vtworker from updating replication topology
	// after restarting replication after a split clone/diff.
	DisableActiveReparents = flag.Bool("disable_active_reparents", false, "if set, do not allow active reparents. Use this to protect a cluster using external reparents.")
)
View Source 
var (
	// ErrNotMaster means there is no master status
	ErrNotMaster = errors.New("no master status")
)

Functions

func Backup 

func Backup(ctx context.Context, cnf *Mycnf, mysqld MysqlDaemon, logger logutil.Logger, dir, name string, backupConcurrency int, hookExtraEnv map[string]string) error

Backup is the main entry point for a backup: - uses the BackupStorage service to store a new backup - shuts down Mysqld during the backup - remember if we were replicating, restore the exact same state

func ConcurrentMap 

func ConcurrentMap(concurrency, n int, fun MapFunc) error

ConcurrentMap applies fun in a concurrent manner on integers from 0 to n-1 (they are assumed to be indexes of some slice containing items to be processed). The first error returned by a fun application will returned (subsequent errors will only be logged). It will use concurrency goroutines.

func CreateMysqldAndMycnf 

func CreateMysqldAndMycnf(tabletUID uint32, mysqlSocket string, mysqlPort int32) (*Mysqld, *Mycnf, error)

CreateMysqldAndMycnf returns a Mysqld and a Mycnf object to use for working with a MySQL installation that hasn't been set up yet.

func CreateReparentJournal 

func CreateReparentJournal() []string

CreateReparentJournal returns the commands to execute to create the _vt.reparent_journal table. It is safe to run these commands even if the table already exists.

If the table was created by Vitess version 2.0, the following command may need to be run: ALTER TABLE _vt.reparent_journal MODIFY COLUMN replication_position VARBINARY(64000);

func FindSlaves 

func FindSlaves(mysqld MysqlDaemon) ([]string, error)

FindSlaves gets IP addresses for all currently connected slaves.

func GetPermissions 

func GetPermissions(mysqld MysqlDaemon) (*tabletmanagerdatapb.Permissions, error)

GetPermissions lists the permissions on the mysqld

func MycnfFile 

func MycnfFile(uid uint32) string

MycnfFile returns the default location of the my.cnf file.

func OpenMysqldAndMycnf 

func OpenMysqldAndMycnf(tabletUID uint32) (*Mysqld, *Mycnf, error)

OpenMysqldAndMycnf returns a Mysqld and a Mycnf object to use for working with a MySQL installation that already exists. The Mycnf will be built based on the my.cnf file of the MySQL instance.

func PopulateReparentJournal 

func PopulateReparentJournal(timeCreatedNS int64, actionName, masterAlias string, pos mysql.Position) string

PopulateReparentJournal returns the SQL command to use to populate the _vt.reparent_journal table, as well as the time_created_ns value used.

func RegisterFlags 

func RegisterFlags()

RegisterFlags registers the command line flags for specifying the values of a mycnf config file. See NewMycnfFromFlags to get the supported modes.

func ResolveTables 

func ResolveTables(mysqld MysqlDaemon, dbName string, tables []string) ([]string, error)

ResolveTables returns a list of actual tables+views matching a list of regexps

func Restore 

func Restore(
	ctx context.Context,
	cnf *Mycnf,
	mysqld MysqlDaemon,
	dir string,
	restoreConcurrency int,
	hookExtraEnv map[string]string,
	localMetadata map[string]string,
	logger logutil.Logger,
	deleteBeforeRestore bool,
	dbName string) (mysql.Position, error)

Restore is the main entry point for backup restore. If there is no appropriate backup on the BackupStorage, Restore logs an error and returns ErrNoBackup. Any other error is returned.

func TabletDir 

func TabletDir(uid uint32) string

TabletDir returns the default directory for a tablet

func TopLevelDirs 

func TopLevelDirs() []string

TopLevelDirs returns the list of directories in the toplevel tablet directory that might be located in a different place.

func WaitForSlaveStart 

func WaitForSlaveStart(mysqld MysqlDaemon, slaveStartDeadline int) error

WaitForSlaveStart waits until the deadline for replication to start. This validates the current master is correct and can be connected to.

Types

type BackupManifest 

type BackupManifest struct {
	// FileEntries contains all the files in the backup
	FileEntries []FileEntry

	// Position is the position at which the backup was taken
	Position mysql.Position

	// TransformHook that was used on the files, if any.
	TransformHook string

	// SkipCompress can be set if the backup files were not run
	// through gzip. It is the negative of the flag, so old
	// backups that don't have this flag are assumed to be
	// compressed.
	SkipCompress bool
}

BackupManifest represents the backup. It lists all the files, the Position that the backup was taken at, and the transform hook used, if any.

type FileEntry 

type FileEntry struct {
	// Base is one of:
	// - backupInnodbDataHomeDir for files that go into Mycnf.InnodbDataHomeDir
	// - backupInnodbLogGroupHomeDir for files that go into Mycnf.InnodbLogGroupHomeDir
	// - backupData for files that go into Mycnf.DataDir
	Base string

	// Name is the file name, relative to Base
	Name string

	// Hash is the hash of the final data (transformed and
	// compressed if specified) stored in the BackupStorage.
	Hash string
}

FileEntry is one file to backup

type MapFunc 

type MapFunc func(index int) error

type Mycnf 

type Mycnf struct {
	// ServerID is the unique id for this server.
	// Used to create a bunch of named directories.
	ServerID uint32

	// MysqlPort is the port for the MySQL server running on this machine.
	// It is mainly used to communicate with topology server.
	MysqlPort int32

	// DataDir is where the table files are
	// (used by vt software for Clone)
	DataDir string

	// InnodbDataHomeDir is the data directory for innodb.
	// (used by vt software for Clone)
	InnodbDataHomeDir string

	// InnodbLogGroupHomeDir is the logs directory for innodb.
	// (used by vt software for Clone)
	InnodbLogGroupHomeDir string

	// SocketFile is the path to the local mysql.sock file.
	// (used by vt software to check server is running)
	SocketFile string

	// GeneralLogPath is the path to store general logs at,
	// if general-log is enabled.
	// (unused by vt software for now)
	GeneralLogPath string

	// ErrorLogPath is the path to store error logs at.
	// (unused by vt software for now)
	ErrorLogPath string

	// SlowLogPath is the slow query log path
	// (unused by vt software for now)
	SlowLogPath string

	// RelayLogPath is the path of the relay logs
	// (unused by vt software for now)
	RelayLogPath string

	// RelayLogIndexPath is the file name for the relay log index
	// (unused by vt software for now)
	RelayLogIndexPath string

	// RelayLogInfoPath is the file name for the relay log info file
	// (unused by vt software for now)
	RelayLogInfoPath string

	// BinLogPath is the base path for binlogs
	// (used by vt software for binlog streaming)
	BinLogPath string

	// MasterInfoFile is the master.info file location.
	// (unused by vt software for now)
	MasterInfoFile string

	// PidFile is the mysql.pid file location
	// (used by vt software to check server is running)
	PidFile string

	// TmpDir is where to create temporary tables
	// (unused by vt software for now)
	TmpDir string

	// SlaveLoadTmpDir is where to create tmp files for replication
	// (unused by vt software for now)
	SlaveLoadTmpDir string
	// contains filtered or unexported fields
}

Mycnf is a memory structure that contains a bunch of interesting parameters to start mysqld. It can be used to generate standard my.cnf files from a server id and mysql port. It can also be populated from an existing my.cnf, or by command line parameters.

func NewMycnf 

func NewMycnf(tabletUID uint32, mysqlPort int32) *Mycnf

NewMycnf fills the Mycnf structure with vt root paths and derived values. This is used to fill out the cnfTemplate values and generate my.cnf. uid is a unique id for a particular tablet - it must be unique within the tabletservers deployed within a keyspace, lest there be collisions on disk. mysqldPort needs to be unique per instance per machine.

func NewMycnfFromFlags 

func NewMycnfFromFlags(uid uint32) (mycnf *Mycnf, err error)

NewMycnfFromFlags creates a Mycnf object from the command line flags.

Multiple modes are supported:

  • at least mycnf_server_id is set on the command line --> then we read all parameters from the command line, and not from any my.cnf file.
  • mycnf_server_id is not passed in, but mycnf-file is passed in --> then we read that mycnf file
  • mycnf_server_id and mycnf-file are not passed in: --> then we use the default location of the my.cnf file for the provided uid and read that my.cnf file.

RegisterCommandLineFlags should have been called before calling this, otherwise we'll panic.

func ReadMycnf 

func ReadMycnf(mycnf *Mycnf) (*Mycnf, error)

ReadMycnf will read an existing my.cnf from disk, and update the passed in Mycnf object with values from the my.cnf on disk.

func (*Mycnf) RandomizeMysqlServerID 

func (cnf *Mycnf) RandomizeMysqlServerID() error

RandomizeMysqlServerID generates a random MySQL server_id.

The value assigned to ServerID will be in the range [100, 2^31): - It avoids 0 because that's reserved for mysqlbinlog dumps. - It also avoids 1-99 because low numbers are used for fake slave connections. See NewSlaveConnection() in binlog/slave_connection.go for more on that. - It avoids the 2^31 - 2^32-1 range, as there seems to be some confusion there. The main MySQL documentation at: http://dev.mysql.com/doc/refman/5.7/en/replication-options.html implies serverID is a full 32 bits number. The semi-sync log line at startup '[Note] Start semi-sync binlog_dump to slave ...' interprets the server_id as signed 32-bit (shows negative numbers for that range). Such an ID may also be responsible for a mysqld crash in semi-sync code, although we haven't been able to verify that yet. The issue for that is: https://github.com/vitessio/vitess/issues/2280

func (*Mycnf) TabletDir 

func (cnf *Mycnf) TabletDir() string

TabletDir returns the tablet directory.

type MysqlDaemon 

type MysqlDaemon interface {
	// methods related to mysql running or not
	Start(ctx context.Context, cnf *Mycnf, mysqldArgs ...string) error
	Shutdown(ctx context.Context, cnf *Mycnf, waitForMysqld bool) error
	RunMysqlUpgrade() error
	ReinitConfig(ctx context.Context, cnf *Mycnf) error
	Wait(ctx context.Context, cnf *Mycnf) error

	// GetMysqlPort returns the current port mysql is listening on.
	GetMysqlPort() (int32, error)

	// replication related methods
	StartSlave(hookExtraEnv map[string]string) error
	StopSlave(hookExtraEnv map[string]string) error
	SlaveStatus() (mysql.SlaveStatus, error)
	SetSemiSyncEnabled(master, slave bool) error
	SemiSyncEnabled() (master, slave bool)
	SemiSyncSlaveStatus() (bool, error)

	// reparenting related methods
	ResetReplication(ctx context.Context) error
	MasterPosition() (mysql.Position, error)
	IsReadOnly() (bool, error)
	SetReadOnly(on bool) error
	SetSlavePosition(ctx context.Context, pos mysql.Position) error
	SetMaster(ctx context.Context, masterHost string, masterPort int, slaveStopBefore bool, slaveStartAfter bool) error
	WaitForReparentJournal(ctx context.Context, timeCreatedNS int64) error

	// DemoteMaster waits for all current transactions to finish,
	// and returns the current replication position. It will not
	// change the read_only state of the server.
	DemoteMaster() (mysql.Position, error)

	WaitMasterPos(context.Context, mysql.Position) error

	// PromoteSlave makes the slave the new master. It will not change
	// the read_only state of the server.
	PromoteSlave(map[string]string) (mysql.Position, error)

	// Schema related methods
	GetSchema(dbName string, tables, excludeTables []string, includeViews bool) (*tabletmanagerdatapb.SchemaDefinition, error)
	PreflightSchemaChange(dbName string, changes []string) ([]*tabletmanagerdatapb.SchemaChangeResult, error)
	ApplySchemaChange(dbName string, change *tmutils.SchemaChange) (*tabletmanagerdatapb.SchemaChangeResult, error)

	// GetAppConnection returns a app connection to be able to talk to the database.
	GetAppConnection(ctx context.Context) (*dbconnpool.PooledDBConnection, error)
	// GetDbaConnection returns a dba connection.
	GetDbaConnection() (*dbconnpool.DBConnection, error)
	// GetAllPrivsConnection returns an allprivs connection (for user with all privileges except SUPER).
	GetAllPrivsConnection() (*dbconnpool.DBConnection, error)

	// ExecuteSuperQueryList executes a list of queries, no result
	ExecuteSuperQueryList(ctx context.Context, queryList []string) error

	// FetchSuperQuery executes one query, returns the result
	FetchSuperQuery(ctx context.Context, query string) (*sqltypes.Result, error)

	// EnableBinlogPlayback enables playback of binlog events
	EnableBinlogPlayback() error

	// DisableBinlogPlayback disable playback of binlog events
	DisableBinlogPlayback() error

	// Close will close this instance of Mysqld. It will wait for all dba
	// queries to be finished.
	Close()
}

MysqlDaemon is the interface we use for abstracting Mysqld.

type Mysqld 

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

Mysqld is the object that represents a mysqld daemon running on this server.

func NewMysqld 

func NewMysqld(dbcfgs *dbconfigs.DBConfigs) *Mysqld

NewMysqld creates a Mysqld object based on the provided configuration and connection parameters.

func (*Mysqld) ApplySchemaChange 

func (mysqld *Mysqld) ApplySchemaChange(dbName string, change *tmutils.SchemaChange) (*tabletmanagerdatapb.SchemaChangeResult, error)

ApplySchemaChange will apply the schema change to the given database.

func (*Mysqld) Close 

func (mysqld *Mysqld) Close()

Close will close this instance of Mysqld. It will wait for all dba queries to be finished.

func (*Mysqld) DemoteMaster 

func (mysqld *Mysqld) DemoteMaster() (rp mysql.Position, err error)

DemoteMaster will gracefully demote a master mysql instance to read only. If the master is still alive, then we need to demote it gracefully make it read-only, flush the writes and get the position

func (*Mysqld) DisableBinlogPlayback 

func (mysqld *Mysqld) DisableBinlogPlayback() error

DisableBinlogPlayback returns the server to the normal state after streaming. Whatever it does for a given flavor, it must be idempotent.

func (*Mysqld) EnableBinlogPlayback 

func (mysqld *Mysqld) EnableBinlogPlayback() error

EnableBinlogPlayback prepares the server to play back events from a binlog stream. Whatever it does for a given flavor, it must be idempotent.

func (*Mysqld) ExecuteSuperQuery 

func (mysqld *Mysqld) ExecuteSuperQuery(ctx context.Context, query string) error

ExecuteSuperQuery allows the user to execute a query as a super user.

func (*Mysqld) ExecuteSuperQueryList 

func (mysqld *Mysqld) ExecuteSuperQueryList(ctx context.Context, queryList []string) error

ExecuteSuperQueryList alows the user to execute queries as a super user.

func (*Mysqld) FetchSuperQuery 

func (mysqld *Mysqld) FetchSuperQuery(ctx context.Context, query string) (*sqltypes.Result, error)

FetchSuperQuery returns the results of executing a query as a super user.

func (*Mysqld) GetAllPrivsConnection 

func (mysqld *Mysqld) GetAllPrivsConnection() (*dbconnpool.DBConnection, error)

GetAllPrivsConnection creates a new DBConnection.

func (*Mysqld) GetAppConnection 

func (mysqld *Mysqld) GetAppConnection(ctx context.Context) (*dbconnpool.PooledDBConnection, error)

GetAppConnection returns a connection from the app pool. Recycle needs to be called on the result.

func (*Mysqld) GetColumns 

func (mysqld *Mysqld) GetColumns(dbName, table string) ([]string, error)

GetColumns returns the columns of table.

func (*Mysqld) GetDbaConnection 

func (mysqld *Mysqld) GetDbaConnection() (*dbconnpool.DBConnection, error)

GetDbaConnection creates a new DBConnection.

func (*Mysqld) GetMysqlPort 

func (mysqld *Mysqld) GetMysqlPort() (int32, error)

GetMysqlPort returns mysql port

func (*Mysqld) GetPrimaryKeyColumns 

func (mysqld *Mysqld) GetPrimaryKeyColumns(dbName, table string) ([]string, error)

GetPrimaryKeyColumns returns the primary key columns of table.

func (*Mysqld) GetSchema 

func (mysqld *Mysqld) GetSchema(dbName string, tables, excludeTables []string, includeViews bool) (*tabletmanagerdatapb.SchemaDefinition, error)

GetSchema returns the schema for database for tables listed in tables. If tables is empty, return the schema for all tables.

func (*Mysqld) Init 

func (mysqld *Mysqld) Init(ctx context.Context, cnf *Mycnf, initDBSQLFile string) error

Init will create the default directory structure for the mysqld process, generate / configure a my.cnf file install a skeleton database, and apply the provided initial SQL file.

func (*Mysqld) InitConfig 

func (mysqld *Mysqld) InitConfig(cnf *Mycnf) error

InitConfig will create the default directory structure for the mysqld process, generate / configure a my.cnf file.

func (*Mysqld) IsReadOnly 

func (mysqld *Mysqld) IsReadOnly() (bool, error)

IsReadOnly return true if the instance is read only

func (*Mysqld) MasterPosition 

func (mysqld *Mysqld) MasterPosition() (mysql.Position, error)

MasterPosition returns the master replication position.

func (*Mysqld) OnTerm 

func (mysqld *Mysqld) OnTerm(f func())

OnTerm registers a function to be called if mysqld terminates for any reason other than a call to Mysqld.Shutdown(). This only works if mysqld was actually started by calling Start() on this Mysqld instance.

func (*Mysqld) PreflightSchemaChange 

func (mysqld *Mysqld) PreflightSchemaChange(dbName string, changes []string) ([]*tabletmanagerdatapb.SchemaChangeResult, error)

PreflightSchemaChange checks the schema changes in "changes" by applying them to an intermediate database that has the same schema as the target database.

func (*Mysqld) PromoteSlave 

func (mysqld *Mysqld) PromoteSlave(hookExtraEnv map[string]string) (mysql.Position, error)

PromoteSlave will promote a slave to be the new master.

func (*Mysqld) RefreshConfig 

func (mysqld *Mysqld) RefreshConfig(ctx context.Context, cnf *Mycnf) error

RefreshConfig attempts to recreate the my.cnf from templates, and log and swap in to place if it's updated. It keeps a copy of the last version in case fallback is required. Should be called from a stable replica, server_id is not regenerated.

func (*Mysqld) ReinitConfig 

func (mysqld *Mysqld) ReinitConfig(ctx context.Context, cnf *Mycnf) error

ReinitConfig updates the config file as if Mysqld is initializing. At the moment it only randomizes ServerID because it's not safe to restore a replica from a backup and then give it the same ServerID as before, MySQL can then skip transactions in the replication stream with the same server_id.

func (*Mysqld) ResetReplication 

func (mysqld *Mysqld) ResetReplication(ctx context.Context) error

ResetReplication resets all replication for this host.

func (*Mysqld) RunMysqlUpgrade 

func (mysqld *Mysqld) RunMysqlUpgrade() error

RunMysqlUpgrade will run the mysql_upgrade program on the current install. Will be called only when mysqld is running with no network and no grant tables.

func (*Mysqld) SemiSyncEnabled 

func (mysqld *Mysqld) SemiSyncEnabled() (master, slave bool)

SemiSyncEnabled returns whether semi-sync is enabled for master or slave. If the semi-sync plugin is not loaded, we assume semi-sync is disabled.

func (*Mysqld) SemiSyncSlaveStatus 

func (mysqld *Mysqld) SemiSyncSlaveStatus() (bool, error)

SemiSyncSlaveStatus returns whether semi-sync is currently used by replication.

func (*Mysqld) SetMaster 

func (mysqld *Mysqld) SetMaster(ctx context.Context, masterHost string, masterPort int, slaveStopBefore bool, slaveStartAfter bool) error

SetMaster makes the provided host / port the master. It optionally stops replication before, and starts it after.

func (*Mysqld) SetReadOnly 

func (mysqld *Mysqld) SetReadOnly(on bool) error

SetReadOnly set/unset the read_only flag

func (*Mysqld) SetSemiSyncEnabled 

func (mysqld *Mysqld) SetSemiSyncEnabled(master, slave bool) error

SetSemiSyncEnabled enables or disables semi-sync replication for master and/or slave mode.

func (*Mysqld) SetSlavePosition 

func (mysqld *Mysqld) SetSlavePosition(ctx context.Context, pos mysql.Position) error

SetSlavePosition sets the replication position at which the slave will resume when its replication is started.

func (*Mysqld) Shutdown 

func (mysqld *Mysqld) Shutdown(ctx context.Context, cnf *Mycnf, waitForMysqld bool) error

Shutdown will stop the mysqld daemon that is running in the background.

waitForMysqld: should the function block until mysqld has stopped? This can actually take a *long* time if the buffer cache needs to be fully flushed - on the order of 20-30 minutes.

If a mysqlctld address is provided in a flag, Shutdown will run remotely.

func (*Mysqld) SlaveStatus 

func (mysqld *Mysqld) SlaveStatus() (mysql.SlaveStatus, error)

SlaveStatus returns the slave replication statuses

func (*Mysqld) Start 

func (mysqld *Mysqld) Start(ctx context.Context, cnf *Mycnf, mysqldArgs ...string) error

Start will start the mysql daemon, either by running the 'mysqld_start' hook, or by running mysqld_safe in the background. If a mysqlctld address is provided in a flag, Start will run remotely. When waiting for mysqld to start, we will use the dba user.

func (*Mysqld) StartSlave 

func (mysqld *Mysqld) StartSlave(hookExtraEnv map[string]string) error

StartSlave starts a slave.

func (*Mysqld) StopSlave 

func (mysqld *Mysqld) StopSlave(hookExtraEnv map[string]string) error

StopSlave stops a slave.

func (*Mysqld) Teardown 

func (mysqld *Mysqld) Teardown(ctx context.Context, cnf *Mycnf, force bool) error

Teardown will shutdown the running daemon, and delete the root directory.

func (*Mysqld) Wait 

func (mysqld *Mysqld) Wait(ctx context.Context, cnf *Mycnf) error

Wait returns nil when mysqld is up and accepting connections. It will use the dba credentials to try to connect. Use wait() with different credentials if needed.

func (*Mysqld) WaitForReparentJournal 

func (mysqld *Mysqld) WaitForReparentJournal(ctx context.Context, timeCreatedNS int64) error

WaitForReparentJournal will wait until the context is done for the row in the reparent_journal table.

func (*Mysqld) WaitMasterPos 

func (mysqld *Mysqld) WaitMasterPos(ctx context.Context, targetPos mysql.Position) error

WaitMasterPos lets slaves wait to given replication position

Source Files

View all Source files

Directories

Path Synopsis
Package backupstorage contains the interface and file system implementation of the backup system.
 Package backupstorage contains the interface and file system implementation of the backup system.
Package cephbackupstorage implements the BackupStorage interface for Ceph Cloud Storage.
 Package cephbackupstorage implements the BackupStorage interface for Ceph Cloud Storage.
Package filebackupstorage implements the BackupStorage interface for a local filesystem (which can be an NFS mount).
 Package filebackupstorage implements the BackupStorage interface for a local filesystem (which can be an NFS mount).
Package gcsbackupstorage implements the BackupStorage interface for Google Cloud Storage.
 Package gcsbackupstorage implements the BackupStorage interface for Google Cloud Storage.
Package grpcmysqlctlclient contains the gRPC1 version of the mysqlctl client protocol.
 Package grpcmysqlctlclient contains the gRPC1 version of the mysqlctl client protocol.
Package grpcmysqlctlserver contains the gRPC implementation of the server side of the remote execution of mysqlctl commands.
 Package grpcmysqlctlserver contains the gRPC implementation of the server side of the remote execution of mysqlctl commands.
Package mysqlctlclient contains the generic client side of the remote mysqlctl protocol.
 Package mysqlctlclient contains the generic client side of the remote mysqlctl protocol.
Package s3backupstorage implements the BackupStorage interface for AWS S3.
 Package s3backupstorage implements the BackupStorage interface for AWS S3.
Package tmutils contains helper methods to deal with the tabletmanagerdata proto3 structures.
 Package tmutils contains helper methods to deal with the tabletmanagerdata proto3 structures.

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