johnyangk closed pull request #120: [NEMO-217] Immediately emits elements in
FlattenTransform
URL: https://github.com/apache/incubator-nemo/pull/120
This is a PR merged from a forked repository.
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diff --git
a/compiler/frontend/beam/src/main/java/org/apache/nemo/compiler/frontend/beam/transform/FlattenTransform.java
b/compiler/frontend/beam/src/main/java/org/apache/nemo/compiler/frontend/beam/transform/FlattenTransform.java
index dd23c9b43..2dd0e61da 100644
---
a/compiler/frontend/beam/src/main/java/org/apache/nemo/compiler/frontend/beam/transform/FlattenTransform.java
+++
b/compiler/frontend/beam/src/main/java/org/apache/nemo/compiler/frontend/beam/transform/FlattenTransform.java
@@ -18,21 +18,17 @@
import org.apache.nemo.common.ir.OutputCollector;
import org.apache.nemo.common.ir.vertex.transform.Transform;
-import java.util.ArrayList;
-
/**
* Flatten transform implementation.
* @param <T> input/output type.
*/
public final class FlattenTransform<T> implements Transform<T, T> {
- private final ArrayList<T> collectedElements;
private OutputCollector<T> outputCollector;
/**
* FlattenTransform Constructor.
*/
public FlattenTransform() {
- this.collectedElements = new ArrayList<>();
}
@Override
@@ -42,13 +38,11 @@ public void prepare(final Context context, final
OutputCollector<T> oc) {
@Override
public void onData(final T element) {
- collectedElements.add(element);
+ outputCollector.emit(element);
}
@Override
public void close() {
- collectedElements.forEach(outputCollector::emit);
- collectedElements.clear();
}
@Override
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