masteryhx commented on code in PR #19142: URL: https://github.com/apache/flink/pull/19142#discussion_r855089980
########## flink-state-backends/flink-statebackend-changelog/src/main/java/org/apache/flink/state/changelog/restore/ChangelogMigrationRestoreTarget.java: ########## @@ -0,0 +1,223 @@ +/* + * 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.restore; + +import org.apache.flink.api.common.state.State; +import org.apache.flink.api.common.state.StateDescriptor; +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.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.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.heap.HeapPriorityQueueElement; +import org.apache.flink.runtime.state.internal.InternalKvState; +import org.apache.flink.runtime.state.metainfo.StateMetaInfoSnapshot; +import org.apache.flink.state.changelog.ChangelogKeyGroupedPriorityQueue; +import org.apache.flink.state.changelog.ChangelogState; +import org.apache.flink.state.changelog.ChangelogStateFactory; + +import javax.annotation.Nonnull; + +import java.util.concurrent.RunnableFuture; +import java.util.stream.Stream; + +/** A {@link ChangelogRestoreTarget} supports to migrate to the delegated keyed state backend. */ +public class ChangelogMigrationRestoreTarget<K> implements ChangelogRestoreTarget<K> { + + private final AbstractKeyedStateBackend<K> keyedStateBackend; + + private final ChangelogStateFactory changelogStateFactory; + + private final FunctionDelegationHelper functionDelegationHelper = + new FunctionDelegationHelper(); + + public ChangelogMigrationRestoreTarget( + AbstractKeyedStateBackend<K> keyedStateBackend, + ChangelogStateFactory changelogStateFactory) { + this.keyedStateBackend = keyedStateBackend; + this.changelogStateFactory = changelogStateFactory; + } + + @Override + public KeyGroupRange getKeyGroupRange() { + return keyedStateBackend.getKeyGroupRange(); + } + + @Override + @SuppressWarnings("unchecked") + public <N, S extends State, V> S createKeyedState( + TypeSerializer<N> namespaceSerializer, StateDescriptor<S, V> stateDescriptor) + throws Exception { + S keyedState = + keyedStateBackend.getOrCreateKeyedState(namespaceSerializer, stateDescriptor); + functionDelegationHelper.addOrUpdate(stateDescriptor); + final InternalKvState<K, N, V> kvState = (InternalKvState<K, N, V>) keyedState; + ChangelogState changelogState = + changelogStateFactory.create(stateDescriptor, kvState, keyedStateBackend); + return (S) changelogState; + } + + @Nonnull + @Override + @SuppressWarnings("unchecked") + public <T extends HeapPriorityQueueElement & PriorityComparable<? super T> & Keyed<?>> + KeyGroupedInternalPriorityQueue<T> createPqState( + @Nonnull String stateName, + @Nonnull TypeSerializer<T> byteOrderedElementSerializer) { + ChangelogKeyGroupedPriorityQueue<T> queue = + (ChangelogKeyGroupedPriorityQueue<T>) + changelogStateFactory.getExistingState( + stateName, StateMetaInfoSnapshot.BackendStateType.PRIORITY_QUEUE); + if (queue == null) { + KeyGroupedInternalPriorityQueue<T> internalPriorityQueue = + keyedStateBackend.create(stateName, byteOrderedElementSerializer); + queue = + changelogStateFactory.create( + stateName, internalPriorityQueue, byteOrderedElementSerializer); + } + return queue; + } + + @Override + public ChangelogState getExistingState( + String name, StateMetaInfoSnapshot.BackendStateType type) { + return changelogStateFactory.getExistingState(name, type); + } + + @Override + public CheckpointableKeyedStateBackend<K> getRestoredKeyedStateBackend() { + // TODO: This inner class make the behaviour of the method of create consistent with + // the method of getOrCreateKeyedState currently which could be removed + // after we support state migration (in FLINK-23143). + // It is also used to maintain FunctionDelegationHelper in the delegated state backend. + return new AbstractKeyedStateBackend<K>(keyedStateBackend) { + Review Comment: I think it's a good suggestion. Done. -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: issues-unsubscr...@flink.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org
