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executor_scatter_stats.go
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/
executor_scatter_stats.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 vtgate
import (
"fmt"
"html/template"
"net/http"
"sync/atomic"
"time"
"vitess.io/vitess/go/vt/logz"
"vitess.io/vitess/go/vt/proto/vtrpc"
"vitess.io/vitess/go/vt/vterrors"
"vitess.io/vitess/go/vt/vtgate/engine"
)
type statsResults struct {
TotalReadOnlyTime time.Duration
TotalScatterTime time.Duration
PercentTimeScatter float64
Items []*statsResultItem
}
// using this intermediate data structure to make testing easier
type statsResultItem struct {
Query string
AvgTimePerQuery time.Duration
PercentTimeOfReads float64
PercentTimeOfScatters float64
PercentCountOfReads float64
PercentCountOfScatters float64
From string
Count uint64
}
func (e *Executor) gatherScatterStats() (statsResults, error) {
scatterExecTime := time.Duration(0)
readOnlyTime := time.Duration(0)
scatterCount := uint64(0)
readOnlyCount := uint64(0)
totalExecTime := time.Duration(0)
totalCount := uint64(0)
var err error
plans := make([]*engine.Plan, 0)
routes := make([]*engine.Route, 0)
// First we go over all plans and collect statistics and all query plans for scatter queries
e.plans.ForEach(func(value any) bool {
plan := value.(*engine.Plan)
scatter := engine.Find(findScatter, plan.Instructions)
readOnly := !engine.Exists(isUpdating, plan.Instructions)
isScatter := scatter != nil
if isScatter {
route, isRoute := scatter.(*engine.Route)
if !isRoute {
err = vterrors.Errorf(vtrpc.Code_INTERNAL, "expected a route, but found a %v", scatter)
return false
}
plans = append(plans, plan)
routes = append(routes, route)
scatterExecTime += time.Duration(atomic.LoadUint64(&plan.ExecTime))
scatterCount += atomic.LoadUint64(&plan.ExecCount)
}
if readOnly {
readOnlyTime += time.Duration(atomic.LoadUint64(&plan.ExecTime))
readOnlyCount += atomic.LoadUint64(&plan.ExecCount)
}
totalExecTime += time.Duration(atomic.LoadUint64(&plan.ExecTime))
totalCount += atomic.LoadUint64(&plan.ExecCount)
return true
})
if err != nil {
return statsResults{}, err
}
// Now we'll go over all scatter queries we've found and produce result items for each
resultItems := make([]*statsResultItem, len(plans))
for i, plan := range plans {
route := routes[i]
execCount := atomic.LoadUint64(&plan.ExecCount)
execTime := time.Duration(atomic.LoadUint64(&plan.ExecTime))
var avgTimePerQuery int64
if execCount != 0 {
avgTimePerQuery = execTime.Nanoseconds() / int64(execCount)
}
resultItems[i] = &statsResultItem{
Query: plan.Original,
AvgTimePerQuery: time.Duration(avgTimePerQuery),
PercentTimeOfReads: 100 * float64(execTime) / float64(readOnlyTime),
PercentTimeOfScatters: 100 * float64(execTime) / float64(scatterExecTime),
PercentCountOfReads: 100 * float64(execCount) / float64(readOnlyCount),
PercentCountOfScatters: 100 * float64(execCount) / float64(scatterCount),
From: route.Keyspace.Name + "." + route.GetTableName(),
Count: execCount,
}
}
result := statsResults{
TotalReadOnlyTime: readOnlyTime,
TotalScatterTime: scatterExecTime,
PercentTimeScatter: 100 * float64(scatterExecTime) / float64(readOnlyTime),
Items: resultItems,
}
return result, nil
}
// WriteScatterStats will write an html report to the provided response writer
func (e *Executor) WriteScatterStats(w http.ResponseWriter) {
logz.StartHTMLTable(w)
defer logz.EndHTMLTable(w)
results, err := e.gatherScatterStats()
if err != nil {
http.Error(w, err.Error(), 500)
return
}
t := template.New("template")
t, err = t.Parse(statsHTML)
if err != nil {
http.Error(w, err.Error(), 500)
return
}
err = t.Execute(w, results)
if err != nil {
http.Error(w, err.Error(), 500)
}
_, err = fmt.Fprintf(w, "Percentage of time spent on scatter queries: %2.2f%%", results.PercentTimeScatter)
if err != nil {
http.Error(w, err.Error(), 500)
}
}
const statsHTML = `
<thead>
<tr>
<th>Query</th>
<th># of executions</th>
<th>Avg time/query</th>
<th>% time of reads</th>
<th>% time of scatters</th>
<th>% of reads</th>
<th>% of scatters</th>
</tr>
</thead>
{{range .Items}}
<tr class="medium">
<td>{{.Query}}</td>
<td>{{.Count}}</td>
<td>{{.AvgTimePerQuery}}</td>
<td>{{.PercentTimeOfReads}}</td>
<td>{{.PercentTimeOfScatters}}</td>
<td>{{.PercentCountOfReads}}</td>
<td>{{.PercentCountOfScatters}}</td>
</tr>
{{end}}
`
func findScatter(p engine.Primitive) bool {
switch v := p.(type) {
case *engine.Route:
return v.Opcode == engine.Scatter
default:
return false
}
}
func isUpdating(p engine.Primitive) bool {
switch p.(type) {
case *engine.Update, *engine.Delete, *engine.Insert:
return true
default:
return false
}
}