curcur commented on a change in pull request #14943: URL: https://github.com/apache/flink/pull/14943#discussion_r592973364
########## File path: flink-state-backends/flink-statebackend-changelog/src/main/java/org/apache/flink/state/changelog/ChangelogKeyedStateBackend.java ########## @@ -0,0 +1,336 @@ +/* + * 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.state.changelog; + +import org.apache.flink.annotation.Internal; +import org.apache.flink.annotation.VisibleForTesting; +import org.apache.flink.api.common.ExecutionConfig; +import org.apache.flink.api.common.state.AggregatingStateDescriptor; +import org.apache.flink.api.common.state.CheckpointListener; +import org.apache.flink.api.common.state.ListStateDescriptor; +import org.apache.flink.api.common.state.MapStateDescriptor; +import org.apache.flink.api.common.state.ReducingStateDescriptor; +import org.apache.flink.api.common.state.State; +import org.apache.flink.api.common.state.StateDescriptor; +import org.apache.flink.api.common.state.ValueStateDescriptor; +import org.apache.flink.api.common.typeutils.TypeSerializer; +import org.apache.flink.api.java.tuple.Tuple2; +import org.apache.flink.runtime.checkpoint.CheckpointOptions; +import org.apache.flink.runtime.checkpoint.CheckpointType; +import org.apache.flink.runtime.state.AbstractKeyedStateBackend; +import org.apache.flink.runtime.state.CheckpointStreamFactory; +import org.apache.flink.runtime.state.CheckpointableKeyedStateBackend; +import org.apache.flink.runtime.state.KeyGroupRange; +import org.apache.flink.runtime.state.KeyGroupedInternalPriorityQueue; +import org.apache.flink.runtime.state.Keyed; +import org.apache.flink.runtime.state.KeyedStateBackend; +import org.apache.flink.runtime.state.KeyedStateFunction; +import org.apache.flink.runtime.state.KeyedStateHandle; +import org.apache.flink.runtime.state.PriorityComparable; +import org.apache.flink.runtime.state.SavepointResources; +import org.apache.flink.runtime.state.SnapshotResult; +import org.apache.flink.runtime.state.StateSnapshotTransformer; +import org.apache.flink.runtime.state.TestableKeyedStateBackend; +import org.apache.flink.runtime.state.heap.HeapPriorityQueueElement; +import org.apache.flink.runtime.state.internal.InternalKvState; +import org.apache.flink.runtime.state.ttl.TtlStateFactory; +import org.apache.flink.runtime.state.ttl.TtlTimeProvider; +import org.apache.flink.util.FlinkRuntimeException; + +import javax.annotation.Nonnull; + +import java.io.IOException; +import java.util.HashMap; +import java.util.Map; +import java.util.concurrent.RunnableFuture; +import java.util.stream.Collectors; +import java.util.stream.Stream; + +import static org.apache.flink.util.Preconditions.checkNotNull; + +/** + * A {@link KeyedStateBackend} that keeps state on the underlying delegated keyed state backend as + * well as on the state change log. + * + * @param <K> The key by which state is keyed. + */ +@Internal +class ChangelogKeyedStateBackend<K> + implements CheckpointableKeyedStateBackend<K>, + CheckpointListener, + TestableKeyedStateBackend { + + private static final Map<Class<? extends StateDescriptor>, StateFactory> STATE_FACTORIES = + Stream.of( + Tuple2.of( + ValueStateDescriptor.class, + (StateFactory) ChangelogValueState::create), + Tuple2.of( + ListStateDescriptor.class, + (StateFactory) ChangelogListState::create), + Tuple2.of( + ReducingStateDescriptor.class, + (StateFactory) ChangelogReducingState::create), + Tuple2.of( + AggregatingStateDescriptor.class, + (StateFactory) ChangelogAggregatingState::create), + Tuple2.of( + MapStateDescriptor.class, + (StateFactory) ChangelogMapState::create)) + .collect(Collectors.toMap(t -> t.f0, t -> t.f1)); + + /** delegated keyedStateBackend. */ + private final AbstractKeyedStateBackend<K> keyedStateBackend; + + /** + * This is the cache maintained by the DelegateKeyedStateBackend itself. It is not the same as + * the underlying delegated keyedStateBackend. InternalKvState is a delegated state. + */ + private final HashMap<String, InternalKvState<K, ?, ?>> keyValueStatesByName; + + private final ExecutionConfig executionConfig; + + private final TtlTimeProvider ttlTimeProvider; + + /** last accessed partitioned state. */ + @SuppressWarnings("rawtypes") + private InternalKvState lastState; + + /** For caching the last accessed partitioned state. */ + private String lastName; + + public ChangelogKeyedStateBackend( + AbstractKeyedStateBackend<K> keyedStateBackend, + ExecutionConfig executionConfig, + TtlTimeProvider ttlTimeProvider) { + this.keyedStateBackend = keyedStateBackend; + this.executionConfig = executionConfig; + this.ttlTimeProvider = ttlTimeProvider; + this.keyValueStatesByName = new HashMap<>(); + } + + // -------------------- CheckpointableKeyedStateBackend -------------------------------- + @Override + public KeyGroupRange getKeyGroupRange() { + return keyedStateBackend.getKeyGroupRange(); + } + + @Override + public void close() throws IOException { + keyedStateBackend.close(); + } + + @Override + public void setCurrentKey(K newKey) { + keyedStateBackend.setCurrentKey(newKey); + } + + @Override + public K getCurrentKey() { + return keyedStateBackend.getCurrentKey(); + } + + @Override + public TypeSerializer<K> getKeySerializer() { + return keyedStateBackend.getKeySerializer(); + } + + @Override + public <N> Stream<K> getKeys(String state, N namespace) { + return keyedStateBackend.getKeys(state, namespace); + } + + @Override + public <N> Stream<Tuple2<K, N>> getKeysAndNamespaces(String state) { + return keyedStateBackend.getKeysAndNamespaces(state); + } + + @Override + public void dispose() { + keyedStateBackend.dispose(); + lastName = null; + lastState = null; + keyValueStatesByName.clear(); + } + + @Override + public void registerKeySelectionListener(KeySelectionListener<K> listener) { + keyedStateBackend.registerKeySelectionListener(listener); + } + + @Override + public boolean deregisterKeySelectionListener(KeySelectionListener<K> listener) { + return keyedStateBackend.deregisterKeySelectionListener(listener); + } + + @Override + public <N, S extends State, T> void applyToAllKeys( + N namespace, + TypeSerializer<N> namespaceSerializer, + StateDescriptor<S, T> stateDescriptor, + KeyedStateFunction<K, S> function) + throws Exception { + + keyedStateBackend.applyToAllKeys( + namespace, + namespaceSerializer, + stateDescriptor, + function, + this::getPartitionedState); + } + + @Override + @SuppressWarnings("unchecked") + public <N, S extends State> S getPartitionedState( Review comment: Same as above. ---------------------------------------------------------------- This is an automated message from the Apache Git Service. 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