[
https://issues.apache.org/jira/browse/BEAM-9919?focusedWorklogId=466497&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-466497
]
ASF GitHub Bot logged work on BEAM-9919:
----------------------------------------
Author: ASF GitHub Bot
Created on: 04/Aug/20 22:27
Start Date: 04/Aug/20 22:27
Worklog Time Spent: 10m
Work Description: pskevin commented on a change in pull request #12445:
URL: https://github.com/apache/beam/pull/12445#discussion_r465365206
##########
File path: sdks/go/examples/xlang/wordcount/xlang_wordcount.go
##########
@@ -0,0 +1,100 @@
+package main
+
+import (
+ "context"
+ "flag"
+ "fmt"
+ "log"
+ "regexp"
+ "strings"
+
+ "github.com/apache/beam/sdks/go/pkg/beam/core/typex"
+ "github.com/apache/beam/sdks/go/pkg/beam/core/util/reflectx"
+
+ "github.com/apache/beam/sdks/go/pkg/beam"
+ "github.com/apache/beam/sdks/go/pkg/beam/io/textio"
+ "github.com/apache/beam/sdks/go/pkg/beam/x/beamx"
+
+ // Imports to enable correct filesystem access and runner setup in
LOOPBACK mode
+ _ "github.com/apache/beam/sdks/go/pkg/beam/io/filesystem/gcs"
+ _ "github.com/apache/beam/sdks/go/pkg/beam/io/filesystem/local"
+ _ "github.com/apache/beam/sdks/go/pkg/beam/runners/universal"
+)
+
+var (
+ // Set this option to choose a different input file or glob.
+ input = flag.String("input", "./input", "File(s) to read.")
+
+ // Set this required option to specify where to write the output.
+ output = flag.String("output", "./output", "Output file (required).")
+)
+
+var (
+ wordRE = regexp.MustCompile(`[a-zA-Z]+('[a-z])?`)
+ empty = beam.NewCounter("extract", "emptyLines")
+ lineLen = beam.NewDistribution("extract", "lineLenDistro")
+)
+
+// extractFn is a DoFn that emits the words in a given line.
+func extractFn(ctx context.Context, line string, emit func(string)) {
+ lineLen.Update(ctx, int64(len(line)))
+ if len(strings.TrimSpace(line)) == 0 {
+ empty.Inc(ctx, 1)
+ }
+ for _, word := range wordRE.FindAllString(line, -1) {
+ emit(word)
+ }
+}
+
+// formatFn is a DoFn that formats a word and its count as a string.
+func formatFn(w string, c int64) string {
+ fmt.Println(w, c)
+ return fmt.Sprintf("%s: %v", w, c)
+}
+
+func init() {
+ beam.RegisterFunction(extractFn)
+ beam.RegisterFunction(formatFn)
+}
+
+func main() {
+ // If beamx or Go flags are used, flags must be parsed first.
+ flag.Parse()
+ // beam.Init() is an initialization hook that must be called on
startup. On
+ // distributed runners, it is used to intercept control.
+ beam.Init()
+
+ // Input validation is done as usual. Note that it must be after Init().
+ if *output == "" {
+ log.Fatal("No output provided")
+ }
+
+ // Concepts #3 and #4: The pipeline uses the named transform and DoFn.
+ p := beam.NewPipeline()
+ s := p.Root()
+
+ lines := textio.Read(s, *input)
+ // Convert lines of text into individual words.
+ col := beam.ParDo(s, extractFn, lines)
+
+ // Using Cross-language Count from Python's test expansion service
+ // TODO(pskevin): Cleaner using-face API
+ outputType := typex.NewKV(typex.New(reflectx.String),
typex.New(reflectx.Int64))
+ external := &beam.ExternalTransform{
+ In: []beam.PCollection{col},
+ Urn: "beam:transforms:xlang:count",
+ ExpansionAddr: "localhost:8118",
+ Out: []typex.FullType{outputType},
+ Bounded: true, // TODO(pskevin): Infer this value from
output PCollection(s) part of the expanded tranform
+ }
+ counted := beam.CrossLanguage(s, p, external) // TODO(pskevin): Add
external transform to Pipeline without passing it to the transform
Review comment:
Ack.
All references to the previous API are just placeholders where (in the
future) code to port the legacy API will go. They don't influence how the
current API is being developed. In fact it's just a bonus that the previous API
can be cleanly supported.
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Issue Time Tracking
-------------------
Worklog Id: (was: 466497)
Time Spent: 1h 50m (was: 1h 40m)
> Add an External transform API to Go SDK
> ---------------------------------------
>
> Key: BEAM-9919
> URL: https://issues.apache.org/jira/browse/BEAM-9919
> Project: Beam
> Issue Type: Sub-task
> Components: sdk-go
> Reporter: Chamikara Madhusanka Jayalath
> Priority: P3
> Time Spent: 1h 50m
> Remaining Estimate: 0h
>
> This transform will be able to expand cross-language transforms by connecting
> to a remote expansion service through Beam expansion API.
> [https://github.com/apache/beam/blob/master/model/job-management/src/main/proto/beam_expansion_api.proto]
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