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Posted to github@beam.apache.org by GitBox <gi...@apache.org> on 2022/12/07 00:14:24 UTC
[GitHub] [beam] lukecwik commented on a diff in pull request #23491: Add MultimapState API
lukecwik commented on code in PR #23491:
URL: https://github.com/apache/beam/pull/23491#discussion_r1041608126
##########
sdks/java/core/src/test/java/org/apache/beam/sdk/transforms/ParDoTest.java:
##########
@@ -2939,22 +3003,108 @@ public void processElement(
@StateId(countStateId) CombiningState<Integer, int[], Integer> count,
OutputReceiver<KV<String, Integer>> r) {
KV<String, Integer> value = element.getValue();
- ReadableState<Iterable<Entry<String, Iterable<Integer>>>> entriesView =
- state.entries();
state.put(value.getKey(), value.getValue());
count.add(1);
+
if (count.read() >= 4) {
- Iterable<Entry<String, Iterable<Integer>>> iterate = state.entries().read();
- state.put("BadKey", -1);
- state.remove("b");
- assertEquals(4, countNestedIterables(iterate));
- assertEquals(4, countNestedIterables(entriesView.read()));
- assertEquals(4, countNestedIterables(state.entries().read()));
-
- for (Entry<String, Iterable<Integer>> entry : entriesView.read()) {
- for (Integer v : entry.getValue()) {
- r.output(KV.of(entry.getKey(), v));
- }
+ // those should be evaluated only when ReadableState.read is called.
+ ReadableState<Iterable<Entry<String, Integer>>> entriesView = state.entries();
+ ReadableState<Iterable<String>> keysView = state.keys();
+ ReadableState<Boolean> containsBView = state.containsKey("b");
+ ReadableState<Iterable<Integer>> getBView = state.get("b");
+ ReadableState<Boolean> isEmptyView = state.isEmpty();
+
+ // those are evaluated immediately.
+ Iterable<Entry<String, Integer>> entries = state.entries().read();
+ Iterable<String> keys = state.keys().read();
+ boolean containsB = state.containsKey("b").read();
+ Iterable<Integer> getB = state.get("b").read();
+ boolean isEmpty = state.isEmpty().read();
+
+ state.clear();
+
+ // entries before and after clear:
+ assertEquals(4, Iterables.size(entries));
+ assertThat(entriesView.read(), emptyIterable());
+ assertThat(state.entries().read(), emptyIterable());
+
+ // keys before and after clear:
+ assertThat(keys, containsInAnyOrder("a", "b"));
+ assertThat(keysView.read(), emptyIterable());
+ assertThat(state.keys().read(), emptyIterable());
+
+ // containsKey before and after clear:
+ assertTrue(containsB);
+ assertFalse(containsBView.read());
+ assertFalse(state.containsKey("b").read());
+
+ // get before and after clear:
+ assertThat(getB, containsInAnyOrder(33));
+ assertThat(getBView.read(), emptyIterable());
+ assertThat(state.get("b").read(), emptyIterable());
+
+ // isEmpty before and after clear:
+ assertFalse(isEmpty);
+ assertTrue(isEmptyView.read());
+ assertTrue(state.isEmpty().read());
+
+ for (Entry<String, Integer> entry : entriesView.read()) {
+ r.output(KV.of(entry.getKey(), entry.getValue()));
+ }
+ }
+ }
+ };
+ PCollection<KV<String, Integer>> output =
+ pipeline
+ .apply(
+ Create.of(
+ KV.of("hello", KV.of("a", 97)), KV.of("hello", KV.of("a", 97)),
+ KV.of("hello", KV.of("a", 98)), KV.of("hello", KV.of("b", 33))))
+ .apply(ParDo.of(fn));
+ PAssert.that(output).empty();
+ pipeline.run();
+ }
+
+ // Use byte[] as the key type of Multimap to test that Multimap should treat different keys with
+ // equivalent structural values as the same key.
+ @Test
+ @Category({ValidatesRunner.class, UsesStatefulParDo.class, UsesMultimapState.class})
+ public void testMultimapStateStructuralValue() {
+ final String stateId = "foo:";
+ final String countStateId = "count";
+ final byte[] bagKey = "BadKey".getBytes(StandardCharsets.UTF_8);
+ DoFn<KV<String, KV<String, Integer>>, KV<String, Integer>> fn =
+ new DoFn<KV<String, KV<String, Integer>>, KV<String, Integer>>() {
+
+ @StateId(stateId)
+ private final StateSpec<MultimapState<byte[], Integer>> multimapState =
+ StateSpecs.multimap(ByteArrayCoder.of(), VarIntCoder.of());
+
+ @StateId(countStateId)
+ private final StateSpec<CombiningState<Integer, int[], Integer>> countState =
+ StateSpecs.combiningFromInputInternal(VarIntCoder.of(), Sum.ofIntegers());
+
+ @ProcessElement
+ public void processElement(
+ ProcessContext c,
+ @Element KV<String, KV<String, Integer>> element,
+ @StateId(stateId) MultimapState<byte[], Integer> state,
+ @StateId(countStateId) CombiningState<Integer, int[], Integer> count,
+ OutputReceiver<KV<String, Integer>> r) {
+ KV<String, Integer> value = element.getValue();
+ ReadableState<Iterable<Entry<byte[], Integer>>> entriesView = state.entries();
+ state.put(value.getKey().getBytes(StandardCharsets.UTF_8), value.getValue());
+ count.add(1);
+ if (count.read() >= 4) {
+ Iterable<Entry<byte[], Integer>> entries = state.entries().read();
+ state.put(bagKey, -1);
+ assertEquals(4, Iterables.size(entries));
+ assertEquals(5, Iterables.size(entriesView.read()));
+ assertEquals(5, Iterables.size(state.entries().read()));
+
Review Comment:
please add coverage for containsKey/get since these accessors are important and need to do the structural key conversion.
##########
runners/core-java/src/main/java/org/apache/beam/runners/core/InMemoryStateInternals.java:
##########
@@ -463,6 +476,116 @@ public InMemoryBag<T> copy() {
}
}
+ /** An {@link InMemoryState} implementation of {@link MultimapState}. */
+ public static final class InMemoryMultimap<K, V>
+ implements MultimapState<K, V>, InMemoryState<InMemoryMultimap<K, V>> {
+ private final Coder<K> keyCoder;
+ private final Coder<V> valueCoder;
+ private Multimap<K, V> contents = ArrayListMultimap.create();
+
+ public InMemoryMultimap(Coder<K> keyCoder, Coder<V> valueCoder) {
+ this.keyCoder = keyCoder;
+ this.valueCoder = valueCoder;
+ }
+
+ @Override
+ public void clear() {
+ contents = ArrayListMultimap.create();
Review Comment:
The +1 was for your response that we need to keep stuff consistent for past reads that were returned.
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