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Posted to issues@flink.apache.org by GitBox <gi...@apache.org> on 2020/10/08 15:28:29 UTC
[GitHub] [flink] aljoscha commented on a change in pull request #13556: [FLINK-19485] Decouple runtime operator implementation from DataStream operations
aljoscha commented on a change in pull request #13556:
URL: https://github.com/apache/flink/pull/13556#discussion_r501802045
##########
File path: flink-streaming-java/src/main/java/org/apache/flink/streaming/api/graph/StreamGraphTranslator.java
##########
@@ -0,0 +1,93 @@
+/*
+ * 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.flink.streaming.api.graph;
+
+import org.apache.flink.annotation.Internal;
+import org.apache.flink.api.dag.Transformation;
+
+import java.util.Collection;
+
+/**
+ * A {@code Translator} is responsible for translating a given {@link Transformation}
+ * to its runtime implementation depending on the execution mode it is being executed.
+ * Currently, the execution mode can be either
+ * {@link org.apache.flink.streaming.api.RuntimeExecutionMode#STREAMING STREAMING} or
+ * {@link org.apache.flink.streaming.api.RuntimeExecutionMode#BATCH BATCH}.
Review comment:
I think we don't need to refer to the API facing enum here, it's enough to know that we translate either for batch or streaming. Because the enum technically also has `AUTOMATIC`.
##########
File path: flink-streaming-java/src/main/java/org/apache/flink/streaming/api/graph/StreamGraphTranslator.java
##########
@@ -0,0 +1,93 @@
+/*
+ * 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.flink.streaming.api.graph;
+
+import org.apache.flink.annotation.Internal;
+import org.apache.flink.api.dag.Transformation;
+
+import java.util.Collection;
+
+/**
+ * A {@code Translator} is responsible for translating a given {@link Transformation}
Review comment:
Should be `{@link StreamGraphTranslator}` or `{@code StreamGraphTranslator}`.
##########
File path: flink-streaming-java/src/main/java/org/apache/flink/streaming/api/graph/StreamGraphTranslator.java
##########
@@ -0,0 +1,93 @@
+/*
+ * 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.flink.streaming.api.graph;
+
+import org.apache.flink.annotation.Internal;
+import org.apache.flink.api.dag.Transformation;
+
+import java.util.Collection;
+
+/**
+ * A {@code Translator} is responsible for translating a given {@link Transformation}
+ * to its runtime implementation depending on the execution mode it is being executed.
Review comment:
```suggestion
* to its runtime implementation depending on the execution mode.
```
##########
File path: flink-streaming-java/src/main/java/org/apache/flink/streaming/api/graph/StreamGraphTranslator.java
##########
@@ -0,0 +1,93 @@
+/*
+ * 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.flink.streaming.api.graph;
+
+import org.apache.flink.annotation.Internal;
+import org.apache.flink.api.dag.Transformation;
+
+import java.util.Collection;
+
+/**
+ * A {@code Translator} is responsible for translating a given {@link Transformation}
+ * to its runtime implementation depending on the execution mode it is being executed.
+ * Currently, the execution mode can be either
+ * {@link org.apache.flink.streaming.api.RuntimeExecutionMode#STREAMING STREAMING} or
+ * {@link org.apache.flink.streaming.api.RuntimeExecutionMode#BATCH BATCH}.
+ *
+ * @param <OUT> The type of the output elements of the transformation being translated.
+ * @param <T> The type of transformation being translated.
+ */
+@Internal
+public interface StreamGraphTranslator<OUT, T extends Transformation<OUT>> {
+
+ /**
+ * Translates a given {@link Transformation} to its runtime implementation for
+ * {@link org.apache.flink.streaming.api.RuntimeExecutionMode#BATCH BATCH-style} execution.
Review comment:
Same as above about `RuntimeExecutionMode`
##########
File path: flink-streaming-java/src/main/java/org/apache/flink/streaming/api/graph/BaseSimpleTransformationTranslator.java
##########
@@ -0,0 +1,118 @@
+/*
+ * 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.flink.streaming.api.graph;
+
+import org.apache.flink.annotation.Internal;
+import org.apache.flink.api.dag.Transformation;
+import org.apache.flink.streaming.api.transformations.PhysicalTransformation;
+
+import java.util.Collection;
+
+import static org.apache.flink.util.Preconditions.checkNotNull;
+
+/**
+ * A base class for all {@link StreamGraphTranslator StreamGraphTranslators} who translate
+ * {@link Transformation Transformations} that have a single operator in their runtime implementation.
+ * These include most of the currently supported operations.
+ *
+ * @param <OUT> The type of the output elements of the transformation being translated.
+ * @param <T> The type of transformation being translated.
+ */
+@Internal
+public abstract class BaseSimpleTransformationTranslator<OUT, T extends Transformation<OUT>>
Review comment:
Maybe `SingleOperatorTranslator` would be more concise.
##########
File path: flink-streaming-java/src/main/java/org/apache/flink/streaming/api/graph/StreamGraphTranslator.java
##########
@@ -0,0 +1,93 @@
+/*
+ * 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.flink.streaming.api.graph;
+
+import org.apache.flink.annotation.Internal;
+import org.apache.flink.api.dag.Transformation;
+
+import java.util.Collection;
+
+/**
+ * A {@code Translator} is responsible for translating a given {@link Transformation}
+ * to its runtime implementation depending on the execution mode it is being executed.
+ * Currently, the execution mode can be either
+ * {@link org.apache.flink.streaming.api.RuntimeExecutionMode#STREAMING STREAMING} or
+ * {@link org.apache.flink.streaming.api.RuntimeExecutionMode#BATCH BATCH}.
+ *
+ * @param <OUT> The type of the output elements of the transformation being translated.
+ * @param <T> The type of transformation being translated.
+ */
+@Internal
+public interface StreamGraphTranslator<OUT, T extends Transformation<OUT>> {
+
+ /**
+ * Translates a given {@link Transformation} to its runtime implementation for
+ * {@link org.apache.flink.streaming.api.RuntimeExecutionMode#BATCH BATCH-style} execution.
+ *
+ * @param transformation The transformation to be translated.
+ * @param context The translation context.
+ * @return The ids of the nodes corresponding to this transformation in the transformation graph.
+ */
+ Collection<Integer> translateForBatch(
+ final T transformation,
+ final Context context);
+
+ /**
+ * Translates a given {@link Transformation} to its runtime implementation for
+ * {@link org.apache.flink.streaming.api.RuntimeExecutionMode#STREAMING STREAMING-style} execution.
+ *
+ * @param transformation The transformation to be translated.
+ * @param context The translation context.
+ * @return The ids of the nodes corresponding to this transformation in the transformation graph.
+ */
+ Collection<Integer> translateForStreaming(
+ final T transformation,
+ final Context context);
+
+ /**
+ * A context giving the necessary information for the translation of a given transformation.
+ */
+ interface Context {
+
+ /**
+ * Returns the {@link StreamGraph} being created as the transformations
+ * of a pipeline are translated to their runtime implementations.
+ */
+ StreamGraph getStreamGraph();
+
+ /**
+ * Returns the ids of the nodes in the {@link StreamGraph} corresponding to the
+ * provided transformation.
+ *
+ * @param transformation the transformation whose nodes' ids we want.
+ * @return The requested ids.
+ */
+ Collection<Integer> getTransformationIds(final Transformation<?> transformation);
Review comment:
Should maybe be `getStreamNodeIds()`, because it doesn't return transformation its.
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