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From GitBox <...@apache.org>
Subject [GitHub] [beam] youngoli commented on a change in pull request #11197: [BEAM-8292] Portable Reshuffle for Go SDK
Date Tue, 24 Mar 2020 04:20:55 GMT
youngoli commented on a change in pull request #11197: [BEAM-8292] Portable Reshuffle for Go
SDK
URL: https://github.com/apache/beam/pull/11197#discussion_r396853348
 
 

 ##########
 File path: sdks/go/pkg/beam/core/runtime/exec/reshuffle.go
 ##########
 @@ -0,0 +1,170 @@
+// 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 exec
+
+import (
+	"bytes"
+	"context"
+	"fmt"
+	"io"
+	"math/rand"
+
+	"github.com/apache/beam/sdks/go/pkg/beam/core/graph/coder"
+	"github.com/apache/beam/sdks/go/pkg/beam/internal/errors"
+)
+
+// ReshuffleInput is a Node.
+type ReshuffleInput struct {
+	UID   UnitID
+	SID   StreamID
+	Coder *coder.Coder // Coder for the input PCollection.
+	Seed  int64
+	Out   Node
+
+	r    *rand.Rand
+	enc  ElementEncoder
+	wEnc WindowEncoder
+	b    bytes.Buffer
+	// ret is a cached allocations for passing to the next Unit. Units never modify the passed
in FullValue.
+	ret FullValue
+}
+
+// ID returns the unit debug id.
+func (n *ReshuffleInput) ID() UnitID {
+	return n.UID
+}
+
+// Up initializes the value and window encoders, and the random source.
+func (n *ReshuffleInput) Up(ctx context.Context) error {
+	n.enc = MakeElementEncoder(coder.SkipW(n.Coder))
+	n.wEnc = MakeWindowEncoder(n.Coder.Window)
+	n.r = rand.New(rand.NewSource(n.Seed))
+	return nil
+}
+
+// StartBundle is a no-op.
+func (n *ReshuffleInput) StartBundle(ctx context.Context, id string, data DataContext) error
{
+	return MultiStartBundle(ctx, id, data, n.Out)
+}
+
+func (n *ReshuffleInput) ProcessElement(ctx context.Context, value *FullValue, values ...ReStream)
error {
+	n.b.Reset()
+	if err := EncodeWindowedValueHeader(n.wEnc, value.Windows, value.Timestamp, &n.b); err
!= nil {
+		return err
+	}
+	if err := n.enc.Encode(value, &n.b); err != nil {
+		return errors.WithContextf(err, "encoding element %v with coder %v", value, n.Coder)
+	}
+	n.ret = FullValue{Elm: n.r.Int(), Elm2: n.b.Bytes(), Timestamp: value.Timestamp}
+	if err := n.Out.ProcessElement(ctx, &n.ret); err != nil {
+		return err
+	}
+	return nil
 
 Review comment:
   ```suggestion
   	return n.Out.ProcessElement(ctx, &n.ret)
   ```

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