/
vertical_split_diff_cmd.go
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/
vertical_split_diff_cmd.go
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/*
Copyright 2019 The Vitess Authors.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package worker
import (
"flag"
"fmt"
"html/template"
"net/http"
"strconv"
"sync"
"vitess.io/vitess/go/vt/vterrors"
"context"
"vitess.io/vitess/go/vt/concurrency"
"vitess.io/vitess/go/vt/topo/topoproto"
"vitess.io/vitess/go/vt/wrangler"
topodatapb "vitess.io/vitess/go/vt/proto/topodata"
)
const verticalSplitDiffHTML = `
<!DOCTYPE html>
<head>
<title>Vertical Split Diff Action</title>
</head>
<body>
<h1>Vertical Split Diff Action</h1>
{{if .Error}}
<b>Error:</b> {{.Error}}</br>
{{else}}
{{range $i, $si := .Shards}}
<li><a href="/Diffs/VerticalSplitDiff?keyspace={{$si.Keyspace}}&shard={{$si.Shard}}">{{$si.Keyspace}}/{{$si.Shard}}</a></li>
{{end}}
{{end}}
</body>
`
const verticalSplitDiffHTML2 = `
<!DOCTYPE html>
<head>
<title>Vertical Split Diff Action</title>
</head>
<body>
<p>Shard involved: {{.Keyspace}}/{{.Shard}}</p>
<h1>Vertical Split Diff Action</h1>
<form action="/Diffs/VerticalSplitDiff" method="post">
<INPUT type="hidden" name="keyspace" value="{{.Keyspace}}"/>
<LABEL for="minHealthyRdonlyTablets">Minimum Number of required healthy RDONLY tablets: </LABEL>
<INPUT type="text" id="minHealthyRdonlyTablets" name="minHealthyRdonlyTablets" value="{{.DefaultMinHealthyRdonlyTablets}}"></BR>
<LABEL for="parallelDiffsCount">Number of tables to diff in parallel: </LABEL>
<INPUT type="text" id="parallelDiffsCount" name="parallelDiffsCount" value="{{.DefaultParallelDiffsCount}}"></BR>
<INPUT type="hidden" name="shard" value="{{.Shard}}"/>
<INPUT type="submit" name="submit" value="Vertical Split Diff"/>
</form>
</body>
`
var verticalSplitDiffTemplate = mustParseTemplate("verticalSplitDiff", verticalSplitDiffHTML)
var verticalSplitDiffTemplate2 = mustParseTemplate("verticalSplitDiff2", verticalSplitDiffHTML2)
func commandVerticalSplitDiff(wi *Instance, wr *wrangler.Wrangler, subFlags *flag.FlagSet, args []string) (Worker, error) {
minHealthyRdonlyTablets := subFlags.Int("min_healthy_rdonly_tablets", defaultMinHealthyTablets, "minimum number of healthy RDONLY tablets before taking out one")
parallelDiffsCount := subFlags.Int("parallel_diffs_count", defaultParallelDiffsCount, "number of tables to diff in parallel")
destTabletTypeStr := subFlags.String("dest_tablet_type", defaultDestTabletType, "destination tablet type (RDONLY or REPLICA) that will be used to compare the shards")
if err := subFlags.Parse(args); err != nil {
return nil, err
}
if subFlags.NArg() != 1 {
subFlags.Usage()
return nil, fmt.Errorf("command VerticalSplitDiff requires <keyspace/shard>")
}
keyspace, shard, err := topoproto.ParseKeyspaceShard(subFlags.Arg(0))
if err != nil {
return nil, err
}
destTabletType, ok := topodatapb.TabletType_value[*destTabletTypeStr]
if !ok {
return nil, fmt.Errorf("command VerticalSplitDiff invalid dest_tablet_type: %v", destTabletType)
}
return NewVerticalSplitDiffWorker(wr, wi.cell, keyspace, shard, *minHealthyRdonlyTablets, *parallelDiffsCount, topodatapb.TabletType(destTabletType)), nil
}
// shardsWithTablesSources returns all the shards that have SourceShards set
// to one value, with an array of Tables.
func shardsWithTablesSources(ctx context.Context, wr *wrangler.Wrangler) ([]map[string]string, error) {
shortCtx, cancel := context.WithTimeout(ctx, *remoteActionsTimeout)
keyspaces, err := wr.TopoServer().GetKeyspaces(shortCtx)
cancel()
if err != nil {
return nil, vterrors.Wrap(err, "failed to get list of keyspaces")
}
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()
shortCtx, cancel := context.WithTimeout(ctx, *remoteActionsTimeout)
shards, err := wr.TopoServer().GetShardNames(shortCtx, keyspace)
cancel()
if err != nil {
rec.RecordError(vterrors.Wrapf(err, "failed to get list of shards for keyspace '%v'", keyspace))
return
}
for _, shard := range shards {
wg.Add(1)
go func(keyspace, shard string) {
defer wg.Done()
shortCtx, cancel := context.WithTimeout(ctx, *remoteActionsTimeout)
si, err := wr.TopoServer().GetShard(shortCtx, keyspace, shard)
cancel()
if err != nil {
rec.RecordError(vterrors.Wrapf(err, "failed to get details for shard '%v'", topoproto.KeyspaceShardString(keyspace, shard)))
return
}
if len(si.SourceShards) == 1 && len(si.SourceShards[0].Tables) > 0 {
mu.Lock()
result = append(result, map[string]string{
"Keyspace": keyspace,
"Shard": shard,
})
mu.Unlock()
}
}(keyspace, shard)
}
}(keyspace)
}
wg.Wait()
if rec.HasErrors() {
return nil, rec.Error()
}
if len(result) == 0 {
return nil, fmt.Errorf("there are no shards with SourceShards")
}
return result, nil
}
func interactiveVerticalSplitDiff(ctx context.Context, wi *Instance, wr *wrangler.Wrangler, w http.ResponseWriter, r *http.Request) (Worker, *template.Template, map[string]any, error) {
if err := r.ParseForm(); err != nil {
return nil, nil, nil, vterrors.Wrap(err, "cannot parse form")
}
keyspace := r.FormValue("keyspace")
shard := r.FormValue("shard")
if keyspace == "" || shard == "" {
// display the list of possible shards to chose from
result := make(map[string]any)
shards, err := shardsWithTablesSources(ctx, wr)
if err != nil {
result["Error"] = err.Error()
} else {
result["Shards"] = shards
}
return nil, verticalSplitDiffTemplate, result, nil
}
submitButtonValue := r.FormValue("submit")
if submitButtonValue == "" {
// display the input form
result := make(map[string]any)
result["Keyspace"] = keyspace
result["Shard"] = shard
result["DefaultMinHealthyRdonlyTablets"] = fmt.Sprintf("%v", defaultMinHealthyTablets)
result["DefaultParallelDiffsCount"] = fmt.Sprintf("%v", defaultParallelDiffsCount)
return nil, verticalSplitDiffTemplate2, result, nil
}
// get other parameters
minHealthyRdonlyTabletsStr := r.FormValue("minHealthyRdonlyTablets")
minHealthyRdonlyTablets, err := strconv.ParseInt(minHealthyRdonlyTabletsStr, 0, 64)
if err != nil {
return nil, nil, nil, vterrors.Wrap(err, "cannot parse minHealthyRdonlyTablets")
}
parallelDiffsCountStr := r.FormValue("parallelDiffsCount")
parallelDiffsCount, err := strconv.ParseInt(parallelDiffsCountStr, 0, 64)
if err != nil {
return nil, nil, nil, vterrors.Wrap(err, "cannot parse parallelDiffsCount")
}
// start the diff job
// TODO: @rafael - Add option to set destination tablet type in UI form.
wrk := NewVerticalSplitDiffWorker(wr, wi.cell, keyspace, shard, int(minHealthyRdonlyTablets), int(parallelDiffsCount), topodatapb.TabletType_RDONLY)
return wrk, nil, nil, nil
}
func init() {
AddCommand("Diffs", Command{"VerticalSplitDiff",
commandVerticalSplitDiff, interactiveVerticalSplitDiff,
"<keyspace/shard>",
"Diffs an rdonly tablet from the (destination) keyspace/shard against an rdonly tablet from the respective source keyspace/shard." +
" Only compares the tables which were set by a previous VerticalSplitClone command."})
}