[#24789] Make Prism the default Go SDK runner. (#27703)

* [prism] Make Prism the default Go SDK runner.

* ws lint

* add maincall to ptest test.

* update comments on prism test filters.

* Update playground script to use go1.20

* fix typo

---------

Co-authored-by: lostluck <13907733+lostluck@users.noreply.github.com>

sdks/go/examples/large_wordcount/large_wordcount.go

@@ -73,6 +73,7 @@ import (
 	_ "github.com/apache/beam/sdks/v2/go/pkg/beam/runners/direct"
 	_ "github.com/apache/beam/sdks/v2/go/pkg/beam/runners/dot"
 	_ "github.com/apache/beam/sdks/v2/go/pkg/beam/runners/flink"
+	_ "github.com/apache/beam/sdks/v2/go/pkg/beam/runners/prism"
 	_ "github.com/apache/beam/sdks/v2/go/pkg/beam/runners/samza"
 	_ "github.com/apache/beam/sdks/v2/go/pkg/beam/runners/spark"
 	_ "github.com/apache/beam/sdks/v2/go/pkg/beam/runners/universal"

sdks/go/examples/minimal_wordcount/minimal_wordcount.go

@@ -62,7 +62,7 @@ import (
 
 	"github.com/apache/beam/sdks/v2/go/pkg/beam"
 	"github.com/apache/beam/sdks/v2/go/pkg/beam/io/textio"
-	"github.com/apache/beam/sdks/v2/go/pkg/beam/runners/direct"
+	"github.com/apache/beam/sdks/v2/go/pkg/beam/runners/prism"
 	"github.com/apache/beam/sdks/v2/go/pkg/beam/transforms/stats"
 
 	_ "github.com/apache/beam/sdks/v2/go/pkg/beam/io/filesystem/gcs"
@@ -119,6 +119,6 @@ func main() {
 	// formatted strings) to a text file.
 	textio.Write(s, "wordcounts.txt", formatted)
 
-	// Run the pipeline on the direct runner.
-	direct.Execute(context.Background(), p)
+	// Run the pipeline on the prism runner.
+	prism.Execute(context.Background(), p)
 }

sdks/go/examples/snippets/10metrics.go

@@ -34,7 +34,7 @@ func queryMetrics(pr beam.PipelineResult, ns, n string) metrics.QueryResults {
 
 // [END metrics_query]
 
-var runner = "direct"
+var runner = "prism"
 
 // [START metrics_pipeline]
 

sdks/go/pkg/beam/runner.go

@@ -22,10 +22,6 @@ import (
 	"github.com/apache/beam/sdks/v2/go/pkg/beam/log"
 )
 
-// TODO(herohde) 7/6/2017: do we want to make the selected runner visible to
-// transformations? That would allow runner-dependent operations or
-// verification, but require that it is stored in Init and used for Run.
-
 var (
 	runners = make(map[string]func(ctx context.Context, p *Pipeline) (PipelineResult, error))
 )

sdks/go/pkg/beam/runners/direct/direct.go

@@ -15,6 +15,9 @@
 
 // Package direct contains the direct runner for running single-bundle
 // pipelines in the current process. Useful for testing.
+//
+// Deprecated: Use prism as a local runner instead.
+// Reliance on the direct runner leads to non-portable pipelines.
 package direct
 
 import (

sdks/go/pkg/beam/runners/prism/README.md

@@ -30,8 +30,8 @@ single machine use.
 
 For Go SDK users:
   - `import "github.com/apache/beam/sdks/v2/go/pkg/beam/runners/prism"`
-  - Short term: set runner to "prism" to use it, or invoke directly.
-  - Medium term: switch the default from "direct" to "prism".
+  - Short term: set runner to "prism" to use it, or invoke directly. ☑
+  - Medium term: switch the default from "direct" to "prism". ☑
   - Long term: alias "direct" to "prism", and delete legacy Go direct runner.
 
 Prisms allow breaking apart and separating a beam of light into
@@ -118,7 +118,7 @@ can have features selectively disabled to ensure
 
 ## Current Limitations
 
-* Experimental and testing use only.
+* Testing use only.
 * Executing docker containers isn't yet implemented.
     * This precludes running the Java and Python SDKs, or their transforms for Cross Language.
     * Loopback execution only.
@@ -127,7 +127,6 @@ can have features selectively disabled to ensure
     * Not yet suitable for larger jobs, which may have intermediate data that exceeds memory bounds.
     * Doesn't yet support sufficient intermediate data garbage collection for indefinite stream processing.
 * Doesn't yet execute all beam pipeline features.
-* No UI for job status inspection.
 
 ## Implemented so far.
 
@@ -140,18 +139,24 @@ can have features selectively disabled to ensure
     * Global Window
     * Interval Windowing
     * Session Windows.
+* CoGBKs
 * Combines lifted and unlifted.
 * Expands Splittable DoFns
+* Process Continuations (AKA Streaming transform support)
 * Limited support for Process Continuations
   * Residuals are rescheduled for execution immeadiately.
   * The transform must be finite (and eventually return a stop process continuation)
 * Basic Metrics support
+* Stand alone execution support
+  * Web UI available when run as a standalone command.
+* Progess tracking
+    * Channel Splitting
+    * Dynamic Splitting
 
 ## Next feature short list (unordered)
 
 See https://github.com/apache/beam/issues/24789 for current status.
 
-* Resolve watermark advancement for Process Continuations
 * Test Stream
 * Triggers & Complex Windowing Strategy execution.
 * State
@@ -162,11 +167,6 @@ See https://github.com/apache/beam/issues/24789 for current status.
 * FnAPI Optimizations
   * Fusion
   * Data with ProcessBundleRequest & Response
-* Progess tracking
-    * Channel Splitting
-    * Dynamic Splitting
-* Stand alone execution support
-* UI reporting of in progress jobs
 
 This is not a comprehensive feature set, but a set of goals to best
 support users of the Go SDK in testing their pipelines.

sdks/go/pkg/beam/testing/ptest/ptest.go

@@ -25,12 +25,13 @@ import (
 	"github.com/apache/beam/sdks/v2/go/pkg/beam"
 	"github.com/apache/beam/sdks/v2/go/pkg/beam/runners" // common runner flag.
 
-	// ptest uses the direct runner to execute pipelines by default.
+	// ptest uses the prism runner to execute pipelines by default.
+	// but includes the direct runner for legacy fallback reasons to
+	// support users overriding the default back to the direct runner.
 	_ "github.com/apache/beam/sdks/v2/go/pkg/beam/runners/direct"
+	_ "github.com/apache/beam/sdks/v2/go/pkg/beam/runners/prism"
 )
 
-// TODO(herohde) 7/10/2017: add hooks to verify counters, logs, etc.
-
 // Create creates a pipeline and a PCollection with the given values.
 func Create(values []any) (*beam.Pipeline, beam.Scope, beam.PCollection) {
 	p := beam.NewPipeline()
@@ -65,7 +66,7 @@ func CreateList2(a, b any) (*beam.Pipeline, beam.Scope, beam.PCollection, beam.P
 // to function.
 var (
 	Runner        = runners.Runner
-	defaultRunner = "direct"
+	defaultRunner = "prism"
 	mainCalled    = false
 )
 

sdks/go/pkg/beam/testing/ptest/ptest_test.go

@@ -21,6 +21,10 @@ import (
 	"github.com/apache/beam/sdks/v2/go/pkg/beam/testing/passert"
 )
 
+func TestMain(m *testing.M) {
+	Main(m)
+}
+
 func TestCreate(t *testing.T) {
 	inputs := []any{"a", "b", "c"}
 	p, s, col := Create(inputs)

sdks/go/pkg/beam/x/beamx/run.go

@@ -32,14 +32,15 @@ import (
 	_ "github.com/apache/beam/sdks/v2/go/pkg/beam/runners/direct"
 	_ "github.com/apache/beam/sdks/v2/go/pkg/beam/runners/dot"
 	_ "github.com/apache/beam/sdks/v2/go/pkg/beam/runners/flink"
+	_ "github.com/apache/beam/sdks/v2/go/pkg/beam/runners/prism"
 	_ "github.com/apache/beam/sdks/v2/go/pkg/beam/runners/samza"
 	_ "github.com/apache/beam/sdks/v2/go/pkg/beam/runners/spark"
 	_ "github.com/apache/beam/sdks/v2/go/pkg/beam/runners/universal"
 )
 
 var (
 	runner        = runners.Runner
-	defaultRunner = "direct"
+	defaultRunner = "prism"
 )
 
 func getRunner() string {
@@ -51,7 +52,7 @@ func getRunner() string {
 }
 
 // Run invokes beam.Run with the runner supplied by the flag "runner". It
-// defaults to the direct runner, but all beam-distributed runners and textio
+// defaults to the prism runner, but all beam-distributed runners and textio
 // filesystems are implicitly registered.
 func Run(ctx context.Context, p *beam.Pipeline) error {
 	_, err := beam.Run(ctx, getRunner(), p)

sdks/go/test/integration/integration.go

@@ -136,6 +136,38 @@ var portableFilters = []string{
 	"TestSetStateClear",
 }
 
+// TODO(lostluck): set up a specific run for these.
+var prismFilters = []string{
+	// The prism runner does not support the TestStream primitive
+	"TestTestStream.*",
+	// The trigger and pane tests uses TestStream
+	"TestTrigger.*",
+	"TestPanes",
+
+	// TODO(https://github.com/apache/beam/issues/21058): Xlang ios don't yet work on prism.
+	"TestKafkaIO.*",
+	// TODO(BEAM-13215): GCP IOs currently do not work in non-Dataflow portable runners.
+	"TestBigQueryIO.*",
+	"TestSpannerIO.*",
+	// The prsim runner does not support pipeline drain for SDF.
+	"TestDrain",
+	// FhirIO currently only supports Dataflow runner
+	"TestFhirIO.*",
+	// OOMs currently only lead to heap dumps on Dataflow runner
+	"TestOomParDo",
+	// The prism runner does not support user state.
+	"TestValueState",
+	"TestValueStateWindowed",
+	"TestValueStateClear",
+	"TestBagState",
+	"TestBagStateClear",
+	"TestCombiningState",
+	"TestMapState",
+	"TestMapStateClear",
+	"TestSetState",
+	"TestSetStateClear",
+}
+
 var flinkFilters = []string{
 	// TODO(https://github.com/apache/beam/issues/20723): Flink tests timing out on reads.
 	"TestXLang_Combine.*",
@@ -249,7 +281,7 @@ var dataflowFilters = []string{
 	"TestCheckpointing",
 	// TODO(21761): This test needs to provide GCP project to expansion service.
 	"TestBigQueryIO_BasicWriteQueryRead",
-	// Can't handle the test spanner container or access a local spanner. 
+	// Can't handle the test spanner container or access a local spanner.
 	"TestSpannerIO.*",
 	// Dataflow does not drain jobs by itself.
 	"TestDrain",
@@ -292,6 +324,8 @@ func CheckFilters(t *testing.T) {
 	switch runner {
 	case "direct", "DirectRunner":
 		filters = directFilters
+	case "prism", "PrismRunner":
+		filters = prismFilters
 	case "portable", "PortableRunner":
 		filters = portableFilters
 	case "flink", "FlinkRunner":