/
cogbk.go
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/
cogbk.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"
)
var (
iterations = flag.Int(
"iterations",
1,
"A number of reiterations over per-key-grouped values to be performed.")
syntheticConfig = flag.String(
"input_options",
"",
"A JSON object that describes the configuration for the first synthetic source.")
coSyntheticConfig = flag.String(
"co_input_options",
"",
"A JSON object that describes the configuration for the second synthetic source.")
)
func init() {
beam.RegisterType(reflect.TypeOf((*ungroupAndReiterateFn)(nil)).Elem())
}
// ungroupAndReiterateFn reiterates given number of times over CoGBK's output.
type ungroupAndReiterateFn struct {
Iterations int
}
func (fn *ungroupAndReiterateFn) ProcessElement(key []byte, p1values, p2values func(*[]byte) bool, emit func([]byte, []byte)) {
var value []byte
for i := 0; i < fn.Iterations; i++ {
for p1values(&value) {
// emit output only once
if i == fn.Iterations-1 {
emit(key, value)
}
}
for p2values(&value) {
if i == fn.Iterations-1 {
emit(key, value)
}
}
}
}
func parseSyntheticConfig(config string) synthetic.SourceConfig {
if config == "" {
panic("--input_options and --co_input_options not provided")
} else {
encoded := []byte(config)
return synthetic.DefaultSourceConfig().BuildFromJSON(encoded)
}
}
func main() {
flag.Parse()
beam.Init()
ctx := context.Background()
p, s := beam.NewPipelineWithRoot()
src1 := synthetic.SourceSingle(s, parseSyntheticConfig(*syntheticConfig))
pc1 := beam.ParDo(s, &load.RuntimeMonitor{}, src1)
src2 := synthetic.SourceSingle(s, parseSyntheticConfig(*coSyntheticConfig))
pc2 := beam.ParDo(s, &load.RuntimeMonitor{}, src2)
joined := beam.CoGroupByKey(s, pc1, pc2)
pc := beam.ParDo(s, &ungroupAndReiterateFn{Iterations: *iterations}, joined)
beam.ParDo(s, &load.RuntimeMonitor{}, pc)
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)
}
}