/
sideinput.go
100 lines (85 loc) · 2.65 KB
/
sideinput.go
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// Licensed to the Apache Software Foundation (ASF) under one or more
// contributor license agreements. See the NOTICE file distributed with
// this work for additional information regarding copyright ownership.
// The ASF licenses this file to You 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 main
import (
"context"
"flag"
"reflect"
"github.com/apache/beam/sdks/v2/go/pkg/beam"
"github.com/apache/beam/sdks/v2/go/pkg/beam/io/synthetic"
"github.com/apache/beam/sdks/v2/go/pkg/beam/log"
"github.com/apache/beam/sdks/v2/go/pkg/beam/x/beamx"
"github.com/apache/beam/sdks/v2/go/test/load"
)
func init() {
beam.RegisterDoFn(reflect.TypeOf((*doFn)(nil)))
}
var (
accessPercentage = flag.Int(
"access_percentage",
100,
"Specifies the percentage of elements in the side input to be accessed.")
syntheticSourceConfig = flag.String(
"input_options",
"",
"A JSON object that describes the configuration for synthetic source")
)
func parseSyntheticConfig() synthetic.SourceConfig {
if *syntheticSourceConfig == "" {
panic("--input_options not provided")
} else {
encoded := []byte(*syntheticSourceConfig)
return synthetic.DefaultSourceConfig().BuildFromJSON(encoded)
}
}
type doFn struct {
ElementsToAccess int
}
func (fn *doFn) ProcessElement(_ []byte, values func(*[]byte, *[]byte) bool, emit func([]byte, []byte)) {
var key []byte
var value []byte
i := 0
for values(&key, &value) {
if i >= fn.ElementsToAccess {
break
}
emit(key, value)
i++
}
}
func main() {
flag.Parse()
beam.Init()
ctx := context.Background()
p, s := beam.NewPipelineWithRoot()
syntheticConfig := parseSyntheticConfig()
elementsToAccess := syntheticConfig.NumElements * *accessPercentage / 100
src := synthetic.SourceSingle(s, syntheticConfig)
src = beam.ParDo(s, &load.RuntimeMonitor{}, src)
src = beam.ParDo(
s,
&doFn{ElementsToAccess: elementsToAccess},
beam.Impulse(s),
beam.SideInput{Input: src})
beam.ParDo(s, &load.RuntimeMonitor{}, src)
presult, err := beamx.RunWithMetrics(ctx, p)
if err != nil {
log.Fatalf(ctx, "Failed to execute job: %v", err)
}
if presult != nil {
metrics := presult.Metrics().AllMetrics()
load.PublishMetrics(metrics)
}
}