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Posted to github@beam.apache.org by GitBox <gi...@apache.org> on 2021/08/26 23:19:59 UTC
[GitHub] [beam] lukecwik opened a new pull request #15405: [BEAM-12802] Define a prefetchable iterator and iterable and utility functions that work over them.
lukecwik opened a new pull request #15405:
URL: https://github.com/apache/beam/pull/15405
This is the basis for migrating the iterator/iterable code path for state requests to be prefetchable.
------------------------
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[GitHub] [beam] lukecwik merged pull request #15405: [BEAM-12802] Define a prefetchable iterator and iterable and utility functions that work over them.
Posted by GitBox <gi...@apache.org>.
lukecwik merged pull request #15405:
URL: https://github.com/apache/beam/pull/15405
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[GitHub] [beam] lukecwik commented on a change in pull request #15405: [BEAM-12802] Define a prefetchable iterator and iterable and utility functions that work over them.
Posted by GitBox <gi...@apache.org>.
lukecwik commented on a change in pull request #15405:
URL: https://github.com/apache/beam/pull/15405#discussion_r703810887
##########
File path: sdks/java/fn-execution/src/main/java/org/apache/beam/sdk/fn/stream/PrefetchableIterators.java
##########
@@ -0,0 +1,210 @@
+/*
+ * 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.fn.stream;
+
+import java.util.Arrays;
+import java.util.Iterator;
+import java.util.NoSuchElementException;
+
+public class PrefetchableIterators {
+
+ private static final PrefetchableIterator<Object> EMPTY_ITERATOR =
+ new PrefetchableIterator<Object>() {
+ @Override
+ public boolean isReady() {
+ return true;
+ }
+
+ @Override
+ public void prefetch() {}
+
+ @Override
+ public boolean hasNext() {
+ return false;
+ }
+
+ @Override
+ public Object next() {
+ throw new NoSuchElementException();
+ }
+ };
+
+ /** Returns an empty {@link PrefetchableIterator}. */
+ public static <T> PrefetchableIterator<T> emptyIterator() {
+ return (PrefetchableIterator<T>) EMPTY_ITERATOR;
+ }
+
+ /**
+ * Returns a {@link PrefetchableIterator} over the specified values.
+ *
+ * <p>{@link PrefetchableIterator#prefetch()} is a no-op and {@link
+ * PrefetchableIterator#isReady()} always returns true.
+ */
+ public static <T> PrefetchableIterator<T> fromArray(T... values) {
+ if (values.length == 0) {
+ return emptyIterator();
+ }
+ return new PrefetchableIterator<T>() {
+ int currentIndex;
+
+ @Override
+ public boolean isReady() {
+ return true;
+ }
+
+ @Override
+ public void prefetch() {}
+
+ @Override
+ public boolean hasNext() {
+ return currentIndex < values.length;
+ }
+
+ @Override
+ public T next() {
+ if (!hasNext()) {
+ throw new NoSuchElementException();
+ }
+ return values[currentIndex++];
+ }
+ };
+ }
+
+ /**
+ * If the {@link Iterator} is not a {@link PrefetchableIterator} then one is constructed that
+ * ensures {@link PrefetchableIterator#prefetch} is a no-op and {@link
+ * PrefetchableIterator#isReady} always returns true.
+ */
+ // package private for PrefetchableIterables.
+ static <T> PrefetchableIterator<T> maybePrefetchable(Iterator<T> iterator) {
+ if (iterator == null) {
+ throw new IllegalArgumentException("Expected non-null iterator.");
+ }
+ if (iterator instanceof PrefetchableIterator) {
+ return (PrefetchableIterator<T>) iterator;
+ }
+ return new PrefetchableIterator<T>() {
+ @Override
+ public boolean isReady() {
+ return true;
+ }
+
+ @Override
+ public void prefetch() {}
+
+ @Override
+ public boolean hasNext() {
+ return iterator.hasNext();
+ }
+
+ @Override
+ public T next() {
+ return iterator.next();
+ }
+ };
+ }
+
+ public static <T> PrefetchableIterator<T> concatIterators(Iterator<Iterator<T>> iterators) {
+ if (!iterators.hasNext()) {
+ return emptyIterator();
+ }
+ // TODO: Share implementation details with #concat version
Review comment:
Yes, I had already made `PrefetchableIterables#concat` re-use `PrefetchableIterators#concat` and forgot to remove this comment. It used to be that `PrefetchableIterables#concat` was a copy.
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[GitHub] [beam] lukecwik commented on pull request #15405: [BEAM-12802] Define a prefetchable iterator and iterable and utility functions that work over them.
Posted by GitBox <gi...@apache.org>.
lukecwik commented on pull request #15405:
URL: https://github.com/apache/beam/pull/15405#issuecomment-906806772
R: @amaliujia @pskevin @kileys
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[GitHub] [beam] lukecwik commented on pull request #15405: [BEAM-12802] Define a prefetchable iterator and iterable and utility functions that work over them.
Posted by GitBox <gi...@apache.org>.
lukecwik commented on pull request #15405:
URL: https://github.com/apache/beam/pull/15405#issuecomment-908561435
Ping @amaliujia @pskevin @kileys, any of you able to review or should I find another reviewer?
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[GitHub] [beam] lukecwik commented on pull request #15405: [BEAM-12802] Define a prefetchable iterator and iterable and utility functions that work over them.
Posted by GitBox <gi...@apache.org>.
lukecwik commented on pull request #15405:
URL: https://github.com/apache/beam/pull/15405#issuecomment-908561435
Ping @amaliujia @pskevin @kileys, any of you able to review or should I find another reviewer?
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[GitHub] [beam] lukecwik commented on pull request #15405: [BEAM-12802] Define a prefetchable iterator and iterable and utility functions that work over them.
Posted by GitBox <gi...@apache.org>.
lukecwik commented on pull request #15405:
URL: https://github.com/apache/beam/pull/15405#issuecomment-906807313
Run Java_Examples_Dataflow PreCommit
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[GitHub] [beam] kileys commented on a change in pull request #15405: [BEAM-12802] Define a prefetchable iterator and iterable and utility functions that work over them.
Posted by GitBox <gi...@apache.org>.
kileys commented on a change in pull request #15405:
URL: https://github.com/apache/beam/pull/15405#discussion_r701547445
##########
File path: sdks/java/fn-execution/src/main/java/org/apache/beam/sdk/fn/stream/PrefetchableIterables.java
##########
@@ -0,0 +1,152 @@
+/*
+ * 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.fn.stream;
+
+import static org.apache.beam.sdk.fn.stream.PrefetchableIterators.emptyIterator;
+
+import java.util.NoSuchElementException;
+import org.apache.beam.vendor.guava.v26_0_jre.com.google.common.collect.FluentIterable;
+
+/**
+ * This class contains static utility functions that operator on or return objects of type {@link
Review comment:
```suggestion
* This class contains static utility functions that operate on or return objects of type {@link
```
##########
File path: sdks/java/fn-execution/src/main/java/org/apache/beam/sdk/fn/stream/PrefetchableIterators.java
##########
@@ -0,0 +1,210 @@
+/*
+ * 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.fn.stream;
+
+import java.util.Arrays;
+import java.util.Iterator;
+import java.util.NoSuchElementException;
+
+public class PrefetchableIterators {
+
+ private static final PrefetchableIterator<Object> EMPTY_ITERATOR =
+ new PrefetchableIterator<Object>() {
+ @Override
+ public boolean isReady() {
+ return true;
+ }
+
+ @Override
+ public void prefetch() {}
+
+ @Override
+ public boolean hasNext() {
+ return false;
+ }
+
+ @Override
+ public Object next() {
+ throw new NoSuchElementException();
+ }
+ };
+
+ /** Returns an empty {@link PrefetchableIterator}. */
+ public static <T> PrefetchableIterator<T> emptyIterator() {
+ return (PrefetchableIterator<T>) EMPTY_ITERATOR;
+ }
+
+ /**
+ * Returns a {@link PrefetchableIterator} over the specified values.
+ *
+ * <p>{@link PrefetchableIterator#prefetch()} is a no-op and {@link
+ * PrefetchableIterator#isReady()} always returns true.
+ */
+ public static <T> PrefetchableIterator<T> fromArray(T... values) {
+ if (values.length == 0) {
+ return emptyIterator();
+ }
+ return new PrefetchableIterator<T>() {
+ int currentIndex;
+
+ @Override
+ public boolean isReady() {
+ return true;
+ }
+
+ @Override
+ public void prefetch() {}
+
+ @Override
+ public boolean hasNext() {
+ return currentIndex < values.length;
+ }
+
+ @Override
+ public T next() {
+ if (!hasNext()) {
+ throw new NoSuchElementException();
+ }
+ return values[currentIndex++];
+ }
+ };
+ }
+
+ /**
+ * If the {@link Iterator} is not a {@link PrefetchableIterator} then one is constructed that
+ * ensures {@link PrefetchableIterator#prefetch} is a no-op and {@link
+ * PrefetchableIterator#isReady} always returns true.
+ */
+ // package private for PrefetchableIterables.
+ static <T> PrefetchableIterator<T> maybePrefetchable(Iterator<T> iterator) {
+ if (iterator == null) {
+ throw new IllegalArgumentException("Expected non-null iterator.");
+ }
+ if (iterator instanceof PrefetchableIterator) {
+ return (PrefetchableIterator<T>) iterator;
+ }
+ return new PrefetchableIterator<T>() {
+ @Override
+ public boolean isReady() {
+ return true;
+ }
+
+ @Override
+ public void prefetch() {}
+
+ @Override
+ public boolean hasNext() {
+ return iterator.hasNext();
+ }
+
+ @Override
+ public T next() {
+ return iterator.next();
+ }
+ };
+ }
+
+ public static <T> PrefetchableIterator<T> concatIterators(Iterator<Iterator<T>> iterators) {
+ if (!iterators.hasNext()) {
+ return emptyIterator();
+ }
+ // TODO: Share implementation details with #concat version
Review comment:
Done?
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