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10metrics.go
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10metrics.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 snippets
import (
"context"
"fmt"
"reflect"
"github.com/apache/beam/sdks/v2/go/pkg/beam"
"github.com/apache/beam/sdks/v2/go/pkg/beam/core/metrics"
)
// [START metrics_query]
func queryMetrics(pr beam.PipelineResult, ns, n string) metrics.QueryResults {
return pr.Metrics().Query(func(r beam.MetricResult) bool {
return r.Namespace() == ns && r.Name() == n
})
}
// [END metrics_query]
var runner = "direct"
// [START metrics_pipeline]
func addMetricDoFnToPipeline(s beam.Scope, input beam.PCollection) beam.PCollection {
return beam.ParDo(s, &MyMetricsDoFn{}, input)
}
func executePipelineAndGetMetrics(ctx context.Context, p *beam.Pipeline) (metrics.QueryResults, error) {
pr, err := beam.Run(ctx, runner, p)
if err != nil {
return metrics.QueryResults{}, err
}
// Request the metric called "counter1" in namespace called "namespace"
ms := pr.Metrics().Query(func(r beam.MetricResult) bool {
return r.Namespace() == "namespace" && r.Name() == "counter1"
})
// Print the metric value - there should be only one line because there is
// only one metric called "counter1" in the namespace called "namespace"
for _, c := range ms.Counters() {
fmt.Println(c.Namespace(), "-", c.Name(), ":", c.Committed)
}
return ms, nil
}
type MyMetricsDoFn struct {
counter beam.Counter
}
func init() {
beam.RegisterType(reflect.TypeOf((*MyMetricsDoFn)(nil)))
}
func (fn *MyMetricsDoFn) Setup() {
// While metrics can be defined in package scope or dynamically
// it's most efficient to include them in the DoFn.
fn.counter = beam.NewCounter("namespace", "counter1")
}
func (fn *MyMetricsDoFn) ProcessElement(ctx context.Context, v beam.V, emit func(beam.V)) {
// count the elements
fn.counter.Inc(ctx, 1)
emit(v)
}
// [END metrics_pipeline]