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Posted to github@beam.apache.org by GitBox <gi...@apache.org> on 2020/10/13 06:08:36 UTC
[GitHub] [beam] nehsyc commented on a change in pull request #13069: [BEAM-10475] Add a well-known coder for ShardedKey in Java/Python SDK
nehsyc commented on a change in pull request #13069:
URL: https://github.com/apache/beam/pull/13069#discussion_r503688064
##########
File path: sdks/java/core/src/main/java/org/apache/beam/sdk/util/ShardedKey.java
##########
@@ -0,0 +1,117 @@
+/*
+ * 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 org.apache.beam.sdk.util;
+
+import com.google.auto.value.AutoValue;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+import java.util.Collections;
+import java.util.List;
+import javax.annotation.Nullable;
+import org.apache.beam.sdk.coders.BooleanCoder;
+import org.apache.beam.sdk.coders.ByteArrayCoder;
+import org.apache.beam.sdk.coders.StructuredCoder;
+import org.apache.beam.sdk.util.common.ElementByteSizeObserver;
+
+/**
+ * A sharded key consisting of a user key and a shard id represented by bytes.
+ *
+ * <p>This is a more generic definition of {@link org.apache.beam.sdk.values.ShardedKey}.
+ */
+@AutoValue
+public abstract class ShardedKey<K> {
+
+ public static <K> ShardedKey<K> of(K key, @Nullable byte[] shardId) {
+ return new AutoValue_ShardedKey(shardId, key);
+ }
+
+ @SuppressWarnings("mutable")
+ @Nullable
+ public abstract byte[] getShardId();
+
+ public abstract K getKey();
+
+ public static class Coder<K> extends StructuredCoder<ShardedKey<K>> {
+
+ private final ByteArrayCoder shardCoder = ByteArrayCoder.of();
+ private final org.apache.beam.sdk.coders.Coder<K> keyCoder;
+
+ private Coder(org.apache.beam.sdk.coders.Coder<K> coder) {
+ keyCoder = coder;
+ }
+
+ public static <K> ShardedKey.Coder<K> of(org.apache.beam.sdk.coders.Coder<K> keyCoder) {
+ return new ShardedKey.Coder<K>(keyCoder);
+ }
+
+ public org.apache.beam.sdk.coders.Coder<K> getKeyCoder() {
+ return keyCoder;
+ }
+
+ @Override
+ public void encode(ShardedKey<K> shardedKey, OutputStream outStream) throws IOException {
+ // The encoding should follow the order:
+ // null indicator
+ // length of shard id
+ // shard id
+ // encoded user key
+ BooleanCoder.of().encode(shardedKey.getShardId() != null, outStream);
+ if (shardedKey.getShardId() != null) {
+ shardCoder.encode(shardedKey.getShardId(), outStream);
Review comment:
Cool! Thanks for confirming.
##########
File path: sdks/java/core/src/main/java/org/apache/beam/sdk/util/ShardedKey.java
##########
@@ -0,0 +1,117 @@
+/*
+ * 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 org.apache.beam.sdk.util;
+
+import com.google.auto.value.AutoValue;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+import java.util.Collections;
+import java.util.List;
+import javax.annotation.Nullable;
+import org.apache.beam.sdk.coders.BooleanCoder;
+import org.apache.beam.sdk.coders.ByteArrayCoder;
+import org.apache.beam.sdk.coders.StructuredCoder;
+import org.apache.beam.sdk.util.common.ElementByteSizeObserver;
+
+/**
+ * A sharded key consisting of a user key and a shard id represented by bytes.
+ *
+ * <p>This is a more generic definition of {@link org.apache.beam.sdk.values.ShardedKey}.
+ */
+@AutoValue
+public abstract class ShardedKey<K> {
+
+ public static <K> ShardedKey<K> of(K key, @Nullable byte[] shardId) {
+ return new AutoValue_ShardedKey(shardId, key);
+ }
+
+ @SuppressWarnings("mutable")
+ @Nullable
+ public abstract byte[] getShardId();
+
+ public abstract K getKey();
+
+ public static class Coder<K> extends StructuredCoder<ShardedKey<K>> {
+
+ private final ByteArrayCoder shardCoder = ByteArrayCoder.of();
+ private final org.apache.beam.sdk.coders.Coder<K> keyCoder;
+
+ private Coder(org.apache.beam.sdk.coders.Coder<K> coder) {
+ keyCoder = coder;
+ }
+
+ public static <K> ShardedKey.Coder<K> of(org.apache.beam.sdk.coders.Coder<K> keyCoder) {
+ return new ShardedKey.Coder<K>(keyCoder);
+ }
+
+ public org.apache.beam.sdk.coders.Coder<K> getKeyCoder() {
+ return keyCoder;
+ }
+
+ @Override
+ public void encode(ShardedKey<K> shardedKey, OutputStream outStream) throws IOException {
+ // The encoding should follow the order:
+ // null indicator
Review comment:
Done.
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