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split_clone_cmd.go
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/
split_clone_cmd.go
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// Copyright 2014, 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 (
"flag"
"fmt"
"html/template"
"net/http"
"strconv"
"strings"
"sync"
"github.com/youtube/vitess/go/vt/concurrency"
"github.com/youtube/vitess/go/vt/topo/topoproto"
"github.com/youtube/vitess/go/vt/topotools"
"github.com/youtube/vitess/go/vt/wrangler"
"golang.org/x/net/context"
)
const splitCloneHTML = `
<!DOCTYPE html>
<head>
<title>Split Clone Action</title>
</head>
<body>
<h1>Split Clone Action</h1>
{{if .Error}}
<b>Error:</b> {{.Error}}</br>
{{else}}
<p>Choose the destination keyspace for this action.</p>
<ul>
{{range $i, $si := .Choices}}
<li><a href="/Clones/SplitClone?keyspace={{$si.Keyspace}}&shard={{$si.Shard}}">{{$si.Keyspace}}/{{$si.Shard}}</a></li>
{{end}}
</ul>
{{end}}
</body>
`
const splitCloneHTML2 = `
<!DOCTYPE html>
<head>
<title>Split Clone Action</title>
</head>
<body>
<p>Shard involved: {{.Keyspace}}/{{.Shard}}</p>
<h1>Split Clone Action</h1>
<form action="/Clones/SplitClone" method="post">
<LABEL for="excludeTables">Exclude Tables: </LABEL>
<INPUT type="text" id="excludeTables" name="excludeTables" value="moving.*"></BR>
<LABEL for="strategy">Strategy: </LABEL>
<INPUT type="text" id="strategy" name="strategy" value="-populate_blp_checkpoint"></BR>
<LABEL for="sourceReaderCount">Source Reader Count: </LABEL>
<INPUT type="text" id="sourceReaderCount" name="sourceReaderCount" value="{{.DefaultSourceReaderCount}}"></BR>
<LABEL for="destinationPackCount">Destination Pack Count: </LABEL>
<INPUT type="text" id="destinationPackCount" name="destinationPackCount" value="{{.DefaultDestinationPackCount}}"></BR>
<LABEL for="minTableSizeForSplit">Minimun Table Size For Split: </LABEL>
<INPUT type="text" id="minTableSizeForSplit" name="minTableSizeForSplit" value="{{.DefaultMinTableSizeForSplit}}"></BR>
<LABEL for="destinationWriterCount">Destination Writer Count: </LABEL>
<INPUT type="text" id="destinationWriterCount" name="destinationWriterCount" value="{{.DefaultDestinationWriterCount}}"></BR>
<INPUT type="hidden" name="keyspace" value="{{.Keyspace}}"/>
<INPUT type="hidden" name="shard" value="{{.Shard}}"/>
<INPUT type="submit" value="Clone"/>
</form>
<h1>Help</h1>
<p>Strategy can have the following values, comma separated:</p>
<ul>
<li><b>populateBlpCheckpoint</b>: creates (if necessary) and populates the blp_checkpoint table in the destination. Required for filtered replication to start.</li>
<li><b>dontStartBinlogPlayer</b>: (requires populateBlpCheckpoint) will setup, but not start binlog replication on the destination. The flag has to be manually cleared from the _vt.blp_checkpoint table.</li>
<li><b>skipSetSourceShards</b>: we won't set SourceShards on the destination shards, disabling filtered replication. Useful for worker tests.</li>
</ul>
</body>
`
var splitCloneTemplate = mustParseTemplate("splitClone", splitCloneHTML)
var splitCloneTemplate2 = mustParseTemplate("splitClone2", splitCloneHTML2)
func commandSplitClone(wi *Instance, wr *wrangler.Wrangler, subFlags *flag.FlagSet, args []string) (Worker, error) {
excludeTables := subFlags.String("exclude_tables", "", "comma separated list of tables to exclude")
strategy := subFlags.String("strategy", "", "which strategy to use for restore, use 'mysqlctl multirestore -strategy=-help' for more info")
sourceReaderCount := subFlags.Int("source_reader_count", defaultSourceReaderCount, "number of concurrent streaming queries to use on the source")
destinationPackCount := subFlags.Int("destination_pack_count", defaultDestinationPackCount, "number of packets to pack in one destination insert")
minTableSizeForSplit := subFlags.Int("min_table_size_for_split", defaultMinTableSizeForSplit, "tables bigger than this size on disk in bytes will be split into source_reader_count chunks if possible")
destinationWriterCount := subFlags.Int("destination_writer_count", defaultDestinationWriterCount, "number of concurrent RPCs to execute on the destination")
if err := subFlags.Parse(args); err != nil {
return nil, err
}
if subFlags.NArg() != 1 {
subFlags.Usage()
return nil, fmt.Errorf("command SplitClone requires <keyspace/shard>")
}
keyspace, shard, err := topoproto.ParseKeyspaceShard(subFlags.Arg(0))
if err != nil {
return nil, err
}
var excludeTableArray []string
if *excludeTables != "" {
excludeTableArray = strings.Split(*excludeTables, ",")
}
worker, err := NewSplitCloneWorker(wr, wi.cell, keyspace, shard, excludeTableArray, *strategy, *sourceReaderCount, *destinationPackCount, uint64(*minTableSizeForSplit), *destinationWriterCount)
if err != nil {
return nil, fmt.Errorf("cannot create split clone worker: %v", err)
}
return worker, nil
}
func keyspacesWithOverlappingShards(ctx context.Context, wr *wrangler.Wrangler) ([]map[string]string, error) {
keyspaces, err := wr.TopoServer().GetKeyspaces(ctx)
if err != nil {
return nil, err
}
wg := sync.WaitGroup{}
mu := sync.Mutex{} // protects result
result := make([]map[string]string, 0, len(keyspaces))
rec := concurrency.AllErrorRecorder{}
for _, keyspace := range keyspaces {
wg.Add(1)
go func(keyspace string) {
defer wg.Done()
osList, err := topotools.FindOverlappingShards(ctx, wr.TopoServer(), keyspace)
if err != nil {
rec.RecordError(err)
return
}
mu.Lock()
for _, os := range osList {
result = append(result, map[string]string{
"Keyspace": os.Left[0].Keyspace(),
"Shard": os.Left[0].ShardName(),
})
}
mu.Unlock()
}(keyspace)
}
wg.Wait()
if rec.HasErrors() {
return nil, rec.Error()
}
if len(result) == 0 {
return nil, fmt.Errorf("There are no keyspaces with overlapping shards")
}
return result, nil
}
func interactiveSplitClone(ctx context.Context, wi *Instance, wr *wrangler.Wrangler, w http.ResponseWriter, r *http.Request) (Worker, *template.Template, map[string]interface{}, error) {
if err := r.ParseForm(); err != nil {
return nil, nil, nil, fmt.Errorf("cannot parse form: %s", err)
}
keyspace := r.FormValue("keyspace")
shard := r.FormValue("shard")
if keyspace == "" || shard == "" {
// display the list of possible splits to choose from
// (just find all the overlapping guys)
result := make(map[string]interface{})
choices, err := keyspacesWithOverlappingShards(ctx, wr)
if err != nil {
result["Error"] = err.Error()
} else {
result["Choices"] = choices
}
return nil, splitCloneTemplate, result, nil
}
sourceReaderCountStr := r.FormValue("sourceReaderCount")
if sourceReaderCountStr == "" {
// display the input form
result := make(map[string]interface{})
result["Keyspace"] = keyspace
result["Shard"] = shard
result["DefaultSourceReaderCount"] = fmt.Sprintf("%v", defaultSourceReaderCount)
result["DefaultDestinationPackCount"] = fmt.Sprintf("%v", defaultDestinationPackCount)
result["DefaultMinTableSizeForSplit"] = fmt.Sprintf("%v", defaultMinTableSizeForSplit)
result["DefaultDestinationWriterCount"] = fmt.Sprintf("%v", defaultDestinationWriterCount)
return nil, splitCloneTemplate2, result, nil
}
// get other parameters
destinationPackCountStr := r.FormValue("destinationPackCount")
excludeTables := r.FormValue("excludeTables")
var excludeTableArray []string
if excludeTables != "" {
excludeTableArray = strings.Split(excludeTables, ",")
}
strategy := r.FormValue("strategy")
sourceReaderCount, err := strconv.ParseInt(sourceReaderCountStr, 0, 64)
if err != nil {
return nil, nil, nil, fmt.Errorf("cannot parse sourceReaderCount: %s", err)
}
destinationPackCount, err := strconv.ParseInt(destinationPackCountStr, 0, 64)
if err != nil {
return nil, nil, nil, fmt.Errorf("cannot parse destinationPackCount: %s", err)
}
minTableSizeForSplitStr := r.FormValue("minTableSizeForSplit")
minTableSizeForSplit, err := strconv.ParseInt(minTableSizeForSplitStr, 0, 64)
if err != nil {
return nil, nil, nil, fmt.Errorf("cannot parse minTableSizeForSplit: %s", err)
}
destinationWriterCountStr := r.FormValue("destinationWriterCount")
destinationWriterCount, err := strconv.ParseInt(destinationWriterCountStr, 0, 64)
if err != nil {
return nil, nil, nil, fmt.Errorf("cannot parse destinationWriterCount: %s", err)
}
// start the clone job
wrk, err := NewSplitCloneWorker(wr, wi.cell, keyspace, shard, excludeTableArray, strategy, int(sourceReaderCount), int(destinationPackCount), uint64(minTableSizeForSplit), int(destinationWriterCount))
if err != nil {
return nil, nil, nil, fmt.Errorf("cannot create worker: %v", err)
}
return wrk, nil, nil, nil
}
func init() {
AddCommand("Clones", Command{"SplitClone",
commandSplitClone, interactiveSplitClone,
"[--exclude_tables=''] [--strategy=''] <keyspace/shard>",
"Replicates the data and creates configuration for a horizontal split."})
}