worker

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Published: Mar 3, 2016 License: BSD-3-Clause Imports: 41 Imported by: 0

Documentation

Overview

Package worker contains the framework, utility methods and core functions for long running actions. 'vtworker' binary will use these.

Index

Constants

This section is empty.

Variables

View Source
var (

	// WaitForHealthyEndPointsTimeout intent is to wait for the
	// healthcheck to automatically return rdonly instances which
	// have been taken out by previous *Clone or *Diff runs.
	// Therefore, the default for this variable must be higher
	// than -health_check_interval.
	// (it is public for tests to override it)
	WaitForHealthyEndPointsTimeout = flag.Duration("wait_for_healthy_rdonly_endpoints_timeout", 60*time.Second, "maximum time to wait if less than --min_healthy_rdonly_endpoints are available")
)

Functions

func AddCommand

func AddCommand(groupName string, c Command)

AddCommand registers a command and makes it available.

func CompareRows

func CompareRows(fields []*querypb.Field, compareCount int, left, right []sqltypes.Value) (int, error)

CompareRows returns: -1 if left is smaller than right 0 if left and right are equal +1 if left is bigger than right TODO: This can panic if types for left and right don't match.

func FindChunks

func FindChunks(ctx context.Context, wr *wrangler.Wrangler, ti *topo.TabletInfo, td *tabletmanagerdatapb.TableDefinition, minTableSizeForSplit uint64, sourceReaderCount int) ([]string, error)

FindChunks returns an array of chunks to use for splitting up a table into multiple data chunks. It only works for tables with a primary key (and the primary key first column is an integer type). The array will always look like: "", "value1", "value2", "" A non-split tablet will just return: "", ""

func FindHealthyRdonlyEndPoint

func FindHealthyRdonlyEndPoint(ctx context.Context, wr *wrangler.Wrangler, cell, keyspace, shard string) (*topodatapb.TabletAlias, error)

FindHealthyRdonlyEndPoint returns a random healthy endpoint. Since we don't want to use them all, we require at least minHealthyEndPoints servers to be healthy. May block up to -wait_for_healthy_rdonly_endpoints_timeout.

func FindWorkerTablet

func FindWorkerTablet(ctx context.Context, wr *wrangler.Wrangler, cleaner *wrangler.Cleaner, cell, keyspace, shard string) (*topodatapb.TabletAlias, error)

FindWorkerTablet will: - find a rdonly instance in the keyspace / shard - mark it as worker - tag it with our worker process

func PrintAllCommands

func PrintAllCommands(logger logutil.Logger)

PrintAllCommands prints a help text for all registered commands to the given Logger.

func RowsEqual

func RowsEqual(left, right []sqltypes.Value) int

RowsEqual returns the index of the first different fields, or -1 if both rows are the same

Types

type Command

type Command struct {
	Name        string
	Method      func(wi *Instance, wr *wrangler.Wrangler, subFlags *flag.FlagSet, args []string) (Worker, error)
	Interactive func(ctx context.Context, wi *Instance, wr *wrangler.Wrangler, w http.ResponseWriter, r *http.Request) (Worker, *template.Template, map[string]interface{}, error)
	Params      string
	Help        string // if help is empty, won't list the command
}

Command contains the detail of a command which can be run in vtworker. While "Method" is run from the command line or RPC, "Interactive" may contain special logic to parse a web form and return templated HTML output.

type DiffReport

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

DiffReport has the stats for a diff job

func (*DiffReport) ComputeQPS

func (dr *DiffReport) ComputeQPS()

ComputeQPS fills in processingQPS

func (*DiffReport) HasDifferences

func (dr *DiffReport) HasDifferences() bool

HasDifferences returns true if the diff job recorded any difference

func (*DiffReport) String

func (dr *DiffReport) String() string

type Instance

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

Instance encapsulate the execution state of vtworker.

func NewInstance

func NewInstance(ctx context.Context, ts topo.Server, cell string, commandDisplayInterval time.Duration) *Instance

NewInstance creates a new Instance.

func (*Instance) CreateWrangler

func (wi *Instance) CreateWrangler(logger logutil.Logger) *wrangler.Wrangler

CreateWrangler creates a new wrangler using the instance specific configuration.

func (*Instance) InitInteractiveMode

func (wi *Instance) InitInteractiveMode()

InitInteractiveMode installs webserver handlers for each known command.

func (*Instance) InitStatusHandling

func (wi *Instance) InitStatusHandling()

InitStatusHandling installs webserver handlers for global actions like /status, /reset and /cancel.

func (*Instance) InstallSignalHandlers

func (wi *Instance) InstallSignalHandlers()

InstallSignalHandlers installs signal handler which exit vtworker gracefully.

func (*Instance) Reset

func (wi *Instance) Reset() error

Reset resets the state of a finished worker. It returns an error if the worker is still running.

func (*Instance) RunCommand

func (wi *Instance) RunCommand(args []string, wr *wrangler.Wrangler, runFromCli bool) (Worker, chan struct{}, error)

RunCommand executes the vtworker command specified by "args". Use WaitForCommand() to block on the returned done channel. If wr is nil, the default wrangler will be used. If you pass a wr wrangler, note that a MemoryLogger will be added to its current logger. The returned worker and done channel may be nil if no worker was started e.g. in case of a "Reset".

func (*Instance) WaitForCommand

func (wi *Instance) WaitForCommand(wrk Worker, done chan struct{}) error

WaitForCommand blocks until "done" is closed. In the meantime, it logs the status of "wrk".

type PanicWorker

type PanicWorker struct {
	StatusWorker
	// contains filtered or unexported fields
}

PanicWorker will run panic() when executed. For internal tests only.

func (*PanicWorker) Run

func (pw *PanicWorker) Run(ctx context.Context) error

Run implements the Worker interface.

func (*PanicWorker) StatusAsHTML

func (pw *PanicWorker) StatusAsHTML() template.HTML

StatusAsHTML implements the Worker interface

func (*PanicWorker) StatusAsText

func (pw *PanicWorker) StatusAsText() string

StatusAsText implements the Worker interface.

type PingWorker

type PingWorker struct {
	StatusWorker
	// contains filtered or unexported fields
}

PingWorker will log a message with level CONSOLE.

func (*PingWorker) Run

func (pw *PingWorker) Run(ctx context.Context) error

Run implements the Worker interface.

func (*PingWorker) StatusAsHTML

func (pw *PingWorker) StatusAsHTML() template.HTML

StatusAsHTML implements the Worker interface

func (*PingWorker) StatusAsText

func (pw *PingWorker) StatusAsText() string

StatusAsText implements the Worker interface.

type QueryResultReader

type QueryResultReader struct {
	Output <-chan *sqltypes.Result
	Fields []*querypb.Field
	// contains filtered or unexported fields
}

QueryResultReader will stream rows towards the output channel.

func NewQueryResultReaderForTablet

func NewQueryResultReaderForTablet(ctx context.Context, ts topo.Server, tabletAlias *topodatapb.TabletAlias, sql string) (*QueryResultReader, error)

NewQueryResultReaderForTablet creates a new QueryResultReader for the provided tablet / sql query

func TableScan

func TableScan(ctx context.Context, log logutil.Logger, ts topo.Server, tabletAlias *topodatapb.TabletAlias, tableDefinition *tabletmanagerdatapb.TableDefinition) (*QueryResultReader, error)

TableScan returns a QueryResultReader that gets all the rows from a table, ordered by Primary Key. The returned columns are ordered with the Primary Key columns in front.

func TableScanByKeyRange

func TableScanByKeyRange(ctx context.Context, log logutil.Logger, ts topo.Server, tabletAlias *topodatapb.TabletAlias, tableDefinition *tabletmanagerdatapb.TableDefinition, keyRange *topodatapb.KeyRange, keyspaceIDType topodatapb.KeyspaceIdType) (*QueryResultReader, error)

TableScanByKeyRange returns a QueryResultReader that gets all the rows from a table that match the supplied KeyRange, ordered by Primary Key. The returned columns are ordered with the Primary Key columns in front.

func (*QueryResultReader) Close

func (qrr *QueryResultReader) Close()

Close closes the connection to the tablet.

func (*QueryResultReader) Error

func (qrr *QueryResultReader) Error() error

type Resolver

type Resolver interface {
	// ResolveDestinationMasters forces the worker to (re)resolve the topology and update
	// the destination masters that it knows about.
	ResolveDestinationMasters(ctx context.Context) error

	// GetDestinationMaster returns the most recently resolved destination master for a particular shard.
	GetDestinationMaster(shardName string) (*topo.TabletInfo, error)
}

Resolver is an interface that should be implemented by any workers that need to resolve the topology.

type RowDiffer

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

RowDiffer will consume rows on both sides, and compare them. It assumes left and right are sorted by ascending primary key. it will record errors if extra rows exist on either side.

func NewRowDiffer

func NewRowDiffer(left, right *QueryResultReader, tableDefinition *tabletmanagerdatapb.TableDefinition) (*RowDiffer, error)

NewRowDiffer returns a new RowDiffer

func (*RowDiffer) Go

func (rd *RowDiffer) Go(log logutil.Logger) (dr DiffReport, err error)

Go runs the diff. If there is no error, it will drain both sides. If an error occurs, it will just return it and stop.

type RowReader

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

RowReader returns individual rows from a QueryResultReader

func NewRowReader

func NewRowReader(queryResultReader *QueryResultReader) *RowReader

NewRowReader returns a RowReader based on the QueryResultReader

func (*RowReader) Drain

func (rr *RowReader) Drain() (int, error)

Drain will empty the RowReader and return how many rows we got

func (*RowReader) Fields

func (rr *RowReader) Fields() []*querypb.Field

Fields returns the types for the rows

func (*RowReader) Next

func (rr *RowReader) Next() ([]sqltypes.Value, error)

Next will return: (row, nil) for the next row (nil, nil) for EOF (nil, error) if an error occurred

type RowSplitter

type RowSplitter struct {
	KeyspaceIdType topodatapb.KeyspaceIdType
	ValueIndex     int
	KeyRanges      []*topodatapb.KeyRange
}

RowSplitter is a helper class to split rows into multiple subsets targeted to different shards.

func NewRowSplitter

func NewRowSplitter(shardInfos []*topo.ShardInfo, keyspaceIdType topodatapb.KeyspaceIdType, valueIndex int) *RowSplitter

NewRowSplitter returns a new row splitter for the given shard distribution.

func (*RowSplitter) Send

func (rs *RowSplitter) Send(fields []*querypb.Field, result [][][]sqltypes.Value, baseCmd string, insertChannels []chan string, abort <-chan struct{}) bool

Send will send the rows to the list of channels. Returns true if aborted.

func (*RowSplitter) Split

func (rs *RowSplitter) Split(result [][][]sqltypes.Value, rows [][]sqltypes.Value) error

Split will split the rows into subset for each distribution

func (*RowSplitter) StartSplit

func (rs *RowSplitter) StartSplit() [][][]sqltypes.Value

StartSplit starts a new split. Split can then be called multiple times.

type RowSubsetDiffer

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

RowSubsetDiffer will consume rows on both sides, and compare them. It assumes superset and subset are sorted by ascending primary key. It will record errors in DiffReport.extraRowsRight if extra rows exist on the subset side, and DiffReport.extraRowsLeft will always be zero.

func NewRowSubsetDiffer

func NewRowSubsetDiffer(superset, subset *QueryResultReader, pkFieldCount int) (*RowSubsetDiffer, error)

NewRowSubsetDiffer returns a new RowSubsetDiffer

func (*RowSubsetDiffer) Go

func (rd *RowSubsetDiffer) Go(log logutil.Logger) (dr DiffReport, err error)

Go runs the diff. If there is no error, it will drain both sides. If an error occurs, it will just return it and stop.

type SplitCloneWorker

type SplitCloneWorker struct {
	StatusWorker
	// contains filtered or unexported fields
}

SplitCloneWorker will clone the data within a keyspace from a source set of shards to a destination set of shards.

func (*SplitCloneWorker) GetDestinationMaster

func (scw *SplitCloneWorker) GetDestinationMaster(shardName string) (*topo.TabletInfo, error)

GetDestinationMaster implements the Resolver interface

func (*SplitCloneWorker) ResolveDestinationMasters

func (scw *SplitCloneWorker) ResolveDestinationMasters(ctx context.Context) error

ResolveDestinationMasters implements the Resolver interface. It will attempt to resolve all shards and update scw.destinationShardsToTablets; if it is unable to do so, it will not modify scw.destinationShardsToTablets at all.

func (*SplitCloneWorker) Run

func (scw *SplitCloneWorker) Run(ctx context.Context) error

Run implements the Worker interface

func (*SplitCloneWorker) StatusAsHTML

func (scw *SplitCloneWorker) StatusAsHTML() template.HTML

StatusAsHTML implements the Worker interface

func (*SplitCloneWorker) StatusAsText

func (scw *SplitCloneWorker) StatusAsText() string

StatusAsText implements the Worker interface

type SplitDiffWorker

type SplitDiffWorker struct {
	StatusWorker
	// contains filtered or unexported fields
}

SplitDiffWorker executes a diff between a destination shard and its source shards in a shard split case.

func (*SplitDiffWorker) Run

func (sdw *SplitDiffWorker) Run(ctx context.Context) error

Run is mostly a wrapper to run the cleanup at the end.

func (*SplitDiffWorker) StatusAsHTML

func (sdw *SplitDiffWorker) StatusAsHTML() template.HTML

StatusAsHTML is part of the Worker interface

func (*SplitDiffWorker) StatusAsText

func (sdw *SplitDiffWorker) StatusAsText() string

StatusAsText is part of the Worker interface

type StatusWorker

type StatusWorker struct {
	// Mu is protecting the state variable, and can also be used
	// by implementations to protect their own variables.
	Mu *sync.Mutex

	// State contains the worker's current state, and should only
	// be accessed under Mu.
	State StatusWorkerState
}

StatusWorker is the base type for a worker which keeps a status. The status is protected by a mutex. Any other internal variable can also be protected by that mutex. StatusWorker also provides default implementations for StatusAsHTML and StatusAsText to make it easier on workers if they don't need to export more.

func NewStatusWorker

func NewStatusWorker() StatusWorker

NewStatusWorker returns a StatusWorker in state WorkerStateNotSarted

func (*StatusWorker) SetState

func (worker *StatusWorker) SetState(state StatusWorkerState)

SetState is a convenience function for workers

func (*StatusWorker) StatusAsHTML

func (worker *StatusWorker) StatusAsHTML() template.HTML

StatusAsHTML is part of the Worker interface

func (*StatusWorker) StatusAsText

func (worker *StatusWorker) StatusAsText() string

StatusAsText is part of the Worker interface

type StatusWorkerState

type StatusWorkerState string

StatusWorkerState is the type for a StatusWorker's status

const (
	WorkerStateNotSarted       StatusWorkerState = "not started"
	WorkerStateDone            StatusWorkerState = "done"
	WorkerStateError           StatusWorkerState = "error"
	WorkerStateInit            StatusWorkerState = "initializing"
	WorkerStateFindTargets     StatusWorkerState = "finding target instances"
	WorkerStateSyncReplication StatusWorkerState = "synchronizing replication"
	WorkerStateCopy            StatusWorkerState = "copying the data"
	WorkerStateDiff            StatusWorkerState = "running the diff"
	WorkerStateCleanUp         StatusWorkerState = "cleaning up"
)

func (StatusWorkerState) String

func (state StatusWorkerState) String() string

type VerticalSplitCloneWorker

type VerticalSplitCloneWorker struct {
	StatusWorker
	// contains filtered or unexported fields
}

VerticalSplitCloneWorker will clone the data from a source keyspace/shard to a destination keyspace/shard.

func (*VerticalSplitCloneWorker) GetDestinationMaster

func (vscw *VerticalSplitCloneWorker) GetDestinationMaster(shardName string) (*topo.TabletInfo, error)

GetDestinationMaster implements the Resolver interface

func (*VerticalSplitCloneWorker) ResolveDestinationMasters

func (vscw *VerticalSplitCloneWorker) ResolveDestinationMasters(ctx context.Context) error

ResolveDestinationMasters implements the Resolver interface. It will attempt to resolve all shards and update vscw.destinationShardsToTablets; if it is unable to do so, it will not modify vscw.destinationShardsToTablets at all.

func (*VerticalSplitCloneWorker) Run

Run implements the Worker interface

func (*VerticalSplitCloneWorker) StatusAsHTML

func (vscw *VerticalSplitCloneWorker) StatusAsHTML() template.HTML

StatusAsHTML implements the Worker interface

func (*VerticalSplitCloneWorker) StatusAsText

func (vscw *VerticalSplitCloneWorker) StatusAsText() string

StatusAsText implements the Worker interface

type VerticalSplitDiffWorker

type VerticalSplitDiffWorker struct {
	StatusWorker
	// contains filtered or unexported fields
}

VerticalSplitDiffWorker executes a diff between a destination shard and its source shards in a shard split case.

func (*VerticalSplitDiffWorker) Run

Run is mostly a wrapper to run the cleanup at the end.

func (*VerticalSplitDiffWorker) StatusAsHTML

func (vsdw *VerticalSplitDiffWorker) StatusAsHTML() template.HTML

StatusAsHTML is part of the Worker interface.

func (*VerticalSplitDiffWorker) StatusAsText

func (vsdw *VerticalSplitDiffWorker) StatusAsText() string

StatusAsText is part of the Worker interface.

type Worker

type Worker interface {
	// StatusAsHTML returns the current worker status in HTML
	StatusAsHTML() template.HTML

	// StatusAsText returns the current worker status in plain text
	StatusAsText() string

	// Run is the main entry point for the worker. It will be
	// called in a go routine.  When the passed in context is
	// cancelled, Run should exit as soon as possible.
	Run(context.Context) error
}

Worker is the base interface for all long running workers.

func NewPanicWorker

func NewPanicWorker(wr *wrangler.Wrangler) (Worker, error)

NewPanicWorker returns a new PanicWorker object.

func NewPingWorker

func NewPingWorker(wr *wrangler.Wrangler, message string) (Worker, error)

NewPingWorker returns a new PingWorker object.

func NewSplitCloneWorker

func NewSplitCloneWorker(wr *wrangler.Wrangler, cell, keyspace, shard string, excludeTables []string, strategyStr string, sourceReaderCount, destinationPackCount int, minTableSizeForSplit uint64, destinationWriterCount int) (Worker, error)

NewSplitCloneWorker returns a new SplitCloneWorker object.

func NewSplitDiffWorker

func NewSplitDiffWorker(wr *wrangler.Wrangler, cell, keyspace, shard string, excludeTables []string) Worker

NewSplitDiffWorker returns a new SplitDiffWorker object.

func NewVerticalSplitCloneWorker

func NewVerticalSplitCloneWorker(wr *wrangler.Wrangler, cell, destinationKeyspace, destinationShard string, tables []string, strategyStr string, sourceReaderCount, destinationPackCount int, minTableSizeForSplit uint64, destinationWriterCount int) (Worker, error)

NewVerticalSplitCloneWorker returns a new VerticalSplitCloneWorker object.

func NewVerticalSplitDiffWorker

func NewVerticalSplitDiffWorker(wr *wrangler.Wrangler, cell, keyspace, shard string) Worker

NewVerticalSplitDiffWorker returns a new VerticalSplitDiffWorker object.

Directories

Path Synopsis
Package fakevtworkerclient contains a fake for the vtworkerclient interface.
Package fakevtworkerclient contains a fake for the vtworkerclient interface.
Package grpcvtworkerclient contains the gRPC version of the vtworker client protocol.
Package grpcvtworkerclient contains the gRPC version of the vtworker client protocol.
Package grpcvtworkerserver contains the gRPC implementation of the server side of the remote execution of vtworker commands.
Package grpcvtworkerserver contains the gRPC implementation of the server side of the remote execution of vtworker commands.
Package vtworkerclient contains the generic client side of the remote vtworker protocol.
Package vtworkerclient contains the generic client side of the remote vtworker protocol.
Package vtworkerclienttest contains the testsuite against which each RPC implementation of the vtworkerclient interface must be tested.
Package vtworkerclienttest contains the testsuite against which each RPC implementation of the vtworkerclient interface must be tested.

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