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sqldiffer.go
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sqldiffer.go
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// Copyright 2013, Google Inc. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package worker
import (
"fmt"
"html/template"
"time"
"golang.org/x/net/context"
"github.com/youtube/vitess/go/vt/topo/topoproto"
"github.com/youtube/vitess/go/vt/wrangler"
pb "github.com/youtube/vitess/go/vt/proto/topodata"
)
// This file contains the code to run a sanity check in a system with
// a lookup database: any row in the actual database needs to have a
// counterpart in the lookup database.
// SourceSpec specifies a SQL query in some keyspace and shard.
type SourceSpec struct {
Keyspace string
Shard string
SQL string
alias *pb.TabletAlias
}
// SQLDiffWorker runs a sanity check in in a system with a lookup
// database: any row in the subset spec needs to have a conuterpart in
// the superset spec.
type SQLDiffWorker struct {
StatusWorker
wr *wrangler.Wrangler
cell string
shard string
cleaner *wrangler.Cleaner
// alias in the following 2 fields is during
// SQLDifferFindTargets, read-only after that.
superset SourceSpec
subset SourceSpec
}
// NewSQLDiffWorker returns a new SQLDiffWorker object.
func NewSQLDiffWorker(wr *wrangler.Wrangler, cell string, superset, subset SourceSpec) Worker {
return &SQLDiffWorker{
StatusWorker: NewStatusWorker(),
wr: wr,
cell: cell,
superset: superset,
subset: subset,
cleaner: new(wrangler.Cleaner),
}
}
// StatusAsHTML is part of the Worker interface
func (worker *SQLDiffWorker) StatusAsHTML() template.HTML {
worker.Mu.Lock()
defer worker.Mu.Unlock()
result := "<b>Working on:</b> " + worker.subset.Keyspace + "/" + worker.subset.Shard + "</br>\n"
result += "<b>State:</b> " + worker.State.String() + "</br>\n"
switch worker.State {
case WorkerStateDiff:
result += "<b>Running...</b></br>\n"
case WorkerStateDone:
result += "<b>Success.</b></br>\n"
}
return template.HTML(result)
}
// StatusAsText is part of the Worker interface
func (worker *SQLDiffWorker) StatusAsText() string {
worker.Mu.Lock()
defer worker.Mu.Unlock()
result := "Working on: " + worker.subset.Keyspace + "/" + worker.subset.Shard + "\n"
result += "State: " + worker.State.String() + "\n"
switch worker.State {
case WorkerStateDiff:
result += "Running...\n"
case WorkerStateDone:
result += "Success.\n"
}
return result
}
// Run is mostly a wrapper to run the cleanup at the end.
func (worker *SQLDiffWorker) Run(ctx context.Context) error {
resetVars()
err := worker.run(ctx)
worker.SetState(WorkerStateCleanUp)
cerr := worker.cleaner.CleanUp(worker.wr)
if cerr != nil {
if err != nil {
worker.wr.Logger().Errorf("CleanUp failed in addition to job error: %v", cerr)
} else {
err = cerr
}
}
if err != nil {
worker.SetState(WorkerStateError)
return err
}
worker.SetState(WorkerStateDone)
return nil
}
func (worker *SQLDiffWorker) run(ctx context.Context) error {
// first state: find targets
if err := worker.findTargets(ctx); err != nil {
return err
}
if err := checkDone(ctx); err != nil {
return err
}
// second phase: synchronize replication
if err := worker.synchronizeReplication(ctx); err != nil {
return err
}
if err := checkDone(ctx); err != nil {
return err
}
// third phase: diff
if err := worker.diff(ctx); err != nil {
return err
}
return nil
}
// findTargets phase:
// - find one rdonly in superset
// - find one rdonly in subset
// - mark them all as 'worker' pointing back to us
func (worker *SQLDiffWorker) findTargets(ctx context.Context) error {
worker.SetState(WorkerStateFindTargets)
// find an appropriate endpoint in superset
var err error
worker.superset.alias, err = FindWorkerTablet(ctx, worker.wr, worker.cleaner, worker.cell, worker.superset.Keyspace, worker.superset.Shard)
if err != nil {
return err
}
// find an appropriate endpoint in subset
worker.subset.alias, err = FindWorkerTablet(ctx, worker.wr, worker.cleaner, worker.cell, worker.subset.Keyspace, worker.subset.Shard)
if err != nil {
return err
}
return nil
}
// synchronizeReplication phase:
// 1 - ask the subset slave to stop replication
// 2 - sleep for 5 seconds
// 3 - ask the superset slave to stop replication
// Note this is not 100% correct, but good enough for now
func (worker *SQLDiffWorker) synchronizeReplication(ctx context.Context) error {
worker.SetState(WorkerStateSyncReplication)
// stop replication on subset slave
worker.wr.Logger().Infof("Stopping replication on subset slave %v", topoproto.TabletAliasString(worker.subset.alias))
subsetTablet, err := worker.wr.TopoServer().GetTablet(ctx, worker.subset.alias)
if err != nil {
return err
}
shortCtx, cancel := context.WithTimeout(ctx, *remoteActionsTimeout)
err = worker.wr.TabletManagerClient().StopSlave(shortCtx, subsetTablet)
cancel()
if err != nil {
return fmt.Errorf("Cannot stop slave %v: %v", topoproto.TabletAliasString(worker.subset.alias), err)
}
if err := checkDone(ctx); err != nil {
return err
}
// change the cleaner actions from ChangeSlaveType(rdonly)
// to StartSlave() + ChangeSlaveType(spare)
wrangler.RecordStartSlaveAction(worker.cleaner, subsetTablet)
action, err := wrangler.FindChangeSlaveTypeActionByTarget(worker.cleaner, worker.subset.alias)
if err != nil {
return fmt.Errorf("cannot find ChangeSlaveType action for %v: %v", topoproto.TabletAliasString(worker.subset.alias), err)
}
action.TabletType = pb.TabletType_SPARE
// sleep for a few seconds
time.Sleep(5 * time.Second)
if err := checkDone(ctx); err != nil {
return err
}
// stop replication on superset slave
worker.wr.Logger().Infof("Stopping replication on superset slave %v", topoproto.TabletAliasString(worker.superset.alias))
supersetTablet, err := worker.wr.TopoServer().GetTablet(ctx, worker.superset.alias)
if err != nil {
return err
}
shortCtx, cancel = context.WithTimeout(ctx, *remoteActionsTimeout)
err = worker.wr.TabletManagerClient().StopSlave(shortCtx, supersetTablet)
cancel()
if err != nil {
return fmt.Errorf("Cannot stop slave %v: %v", topoproto.TabletAliasString(worker.superset.alias), err)
}
// change the cleaner actions from ChangeSlaveType(rdonly)
// to StartSlave() + ChangeSlaveType(spare)
wrangler.RecordStartSlaveAction(worker.cleaner, supersetTablet)
action, err = wrangler.FindChangeSlaveTypeActionByTarget(worker.cleaner, worker.superset.alias)
if err != nil {
return fmt.Errorf("cannot find ChangeSlaveType action for %v: %v", topoproto.TabletAliasString(worker.superset.alias), err)
}
action.TabletType = pb.TabletType_SPARE
return nil
}
// diff phase: will create a list of messages regarding the diff.
// - get the schema on all tablets
// - if some table schema mismatches, record them (use existing schema diff tools).
// - for each table in destination, run a diff pipeline.
func (worker *SQLDiffWorker) diff(ctx context.Context) error {
worker.SetState(WorkerStateDiff)
// run the diff
worker.wr.Logger().Infof("Running the diffs...")
supersetQueryResultReader, err := NewQueryResultReaderForTablet(ctx, worker.wr.TopoServer(), worker.superset.alias, worker.superset.SQL)
if err != nil {
worker.wr.Logger().Errorf("NewQueryResultReaderForTablet(superset) failed: %v", err)
return err
}
defer supersetQueryResultReader.Close()
subsetQueryResultReader, err := NewQueryResultReaderForTablet(ctx, worker.wr.TopoServer(), worker.subset.alias, worker.subset.SQL)
if err != nil {
worker.wr.Logger().Errorf("NewQueryResultReaderForTablet(subset) failed: %v", err)
return err
}
defer subsetQueryResultReader.Close()
differ, err := NewRowSubsetDiffer(supersetQueryResultReader, subsetQueryResultReader, 1)
if err != nil {
worker.wr.Logger().Errorf("NewRowSubsetDiffer() failed: %v", err)
return err
}
report, err := differ.Go(worker.wr.Logger())
switch {
case err != nil:
worker.wr.Logger().Errorf("Differ.Go failed: %v", err)
return err
case report.HasDifferences():
err = fmt.Errorf("Found differences: %v", report.String())
worker.wr.Logger().Infof(err.Error())
default:
worker.wr.Logger().Infof("No difference found (%v rows processed, %v qps)", report.processedRows, report.processingQPS)
}
return err
}