rkhachatryan commented on code in PR #19142: URL: https://github.com/apache/flink/pull/19142#discussion_r854517171
########## flink-runtime/src/main/java/org/apache/flink/runtime/state/changelog/StateChangelogStorageView.java: ########## @@ -0,0 +1,40 @@ +/* + * 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.runtime.state.changelog; + +import org.apache.flink.annotation.Internal; +import org.apache.flink.runtime.io.AvailabilityProvider; + +/** + * A storage view for changelog. Could produce {@link StateChangelogHandleReader} for read. Please + * use {@link StateChangelogStorageLoader} to obtain an instance. + */ +@Internal +public interface StateChangelogStorageView<Handle extends ChangelogStateHandle> + extends AutoCloseable { + + StateChangelogHandleReader<Handle> createReader(); + + @Override + default void close() throws Exception {} + + default AvailabilityProvider getAvailabilityProvider() { + return () -> AvailabilityProvider.AVAILABLE; + } Review Comment: This method is only relevant for writing, so it can be pushed down to `StateChangelogStorage` interface. ########## flink-runtime/src/main/java/org/apache/flink/runtime/state/StateBackendLoader.java: ########## @@ -358,26 +364,57 @@ public static boolean stateBackendFromApplicationOrConfigOrDefaultUseManagedMemo return false; } + /** + * Load state backend which may wrap the original state backend for recovery. + * + * @param originalStateBackend StateBackend loaded from application or config. + * @param classLoader User code classloader. + * @param keyedStateHandles The state handles for restore. + * @return Wrapped state backend for recovery. + * @throws DynamicCodeLoadingException Thrown if keyed state handles of wrapped state backend + * are found and the class was not found or could not be instantiated. + */ + public static StateBackend loadStateBackendFromKeyedStateHandles( + StateBackend originalStateBackend, + ClassLoader classLoader, + Collection<KeyedStateHandle> keyedStateHandles) + throws DynamicCodeLoadingException { + // Wrapping ChangelogStateBackend or ChangelogStateBackendHandle is not supported currently. + if (!isChangelogStateBackend(originalStateBackend) + && keyedStateHandles.stream() + .anyMatch( + stateHandle -> + stateHandle instanceof ChangelogStateBackendHandle)) { + return loadChangelogStateBackend( + originalStateBackend, classLoader, CHANGELOG_STATE_BACKEND_FOR_RECOVERY); + } + return originalStateBackend; + } + + private static boolean isChangelogStateBackend(StateBackend backend) { + return CHANGELOG_STATE_BACKEND.equals(backend.getClass().getName()); + } + private static StateBackend loadChangelogStateBackend( - StateBackend backend, ClassLoader classLoader) throws DynamicCodeLoadingException { + StateBackend backend, ClassLoader classLoader, String className) Review Comment: NIT: now the method is not specific to changelog (but to `DelegatingStateBackend`). So it can be renamed to something like `wrapStateBackend` ########## 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'm wondering whether it makes sense to extract this constructor call into static function; that would prevent leaking of `this` into the created object. WDYT? ########## flink-state-backends/flink-statebackend-changelog/src/main/java/org/apache/flink/state/changelog/ChangelogStateFactory.java: ########## @@ -0,0 +1,233 @@ +/* + * 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.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.core.memory.DataOutputViewStreamWrapper; +import org.apache.flink.runtime.state.KeyGroupedInternalPriorityQueue; +import org.apache.flink.runtime.state.heap.InternalKeyContext; +import org.apache.flink.runtime.state.internal.InternalKvState; +import org.apache.flink.runtime.state.metainfo.StateMetaInfoSnapshot; +import org.apache.flink.util.FlinkRuntimeException; +import org.apache.flink.util.function.ThrowingConsumer; + +import java.io.IOException; +import java.util.Collection; +import java.util.HashMap; +import java.util.Map; +import java.util.stream.Collectors; +import java.util.stream.Stream; + +/** Maintains the lifecycle of all {@link ChangelogState}s. */ +public class ChangelogStateFactory { + + /** + * Unwrapped changelog states used for recovery (not wrapped into e.g. TTL, latency tracking). + */ + private final Map<String, ChangelogState> changelogStates; + + private final Map<String, ChangelogKeyGroupedPriorityQueue<?>> priorityQueueStatesByName; + + public ChangelogStateFactory() { + this.changelogStates = new HashMap<>(); + this.priorityQueueStatesByName = new HashMap<>(); + } + + private static final Map<StateDescriptor.Type, StateFactory> STATE_FACTORIES = + Stream.of( + Tuple2.of( + StateDescriptor.Type.VALUE, + (StateFactory) ChangelogValueState::create), + Tuple2.of( + StateDescriptor.Type.LIST, + (StateFactory) ChangelogListState::create), + Tuple2.of( + StateDescriptor.Type.REDUCING, + (StateFactory) ChangelogReducingState::create), + Tuple2.of( + StateDescriptor.Type.AGGREGATING, + (StateFactory) ChangelogAggregatingState::create), + Tuple2.of( + StateDescriptor.Type.MAP, + (StateFactory) ChangelogMapState::create)) + .collect(Collectors.toMap(t -> t.f0, t -> t.f1)); + + public <K, N, V, S extends State> ChangelogState create( + StateDescriptor<S, V> stateDescriptor, + InternalKvState<K, N, V> internalKvState, + InternalKeyContext<K> keyContext) + throws Exception { + return create( + stateDescriptor, internalKvState, VoidStateChangeLogger.getInstance(), keyContext); + } + + public <K, N, V, S extends State> ChangelogState create( + StateDescriptor<S, V> stateDescriptor, + InternalKvState<K, N, V> internalKvState, + KvStateChangeLogger<V, N> kvStateChangeLogger, + InternalKeyContext<K> keyContext) + throws Exception { + ChangelogState changelogState = + getStateFactory(stateDescriptor) + .create(internalKvState, kvStateChangeLogger, keyContext); + changelogStates.put(stateDescriptor.getName(), changelogState); + return changelogState; + } + + public <T> ChangelogKeyGroupedPriorityQueue<T> create( + String stateName, + KeyGroupedInternalPriorityQueue<T> internalPriorityQueue, + TypeSerializer<T> serializer) { + return create( + stateName, internalPriorityQueue, VoidStateChangeLogger.getInstance(), serializer); + } + + public <T> ChangelogKeyGroupedPriorityQueue<T> create( + String stateName, + KeyGroupedInternalPriorityQueue<T> internalPriorityQueue, + StateChangeLogger<T, Void> logger, + TypeSerializer<T> serializer) { + ChangelogKeyGroupedPriorityQueue<T> changelogKeyGroupedPriorityQueue = + new ChangelogKeyGroupedPriorityQueue<>(internalPriorityQueue, logger, serializer); + priorityQueueStatesByName.put(stateName, changelogKeyGroupedPriorityQueue); + return changelogKeyGroupedPriorityQueue; + } + + /** + * @param name state name + * @param type state type (the only supported type currently are: {@link + * StateMetaInfoSnapshot.BackendStateType#KEY_VALUE key value}, {@link + * StateMetaInfoSnapshot.BackendStateType#PRIORITY_QUEUE priority queue}) + * @return an existing state, i.e. the one that was already created. The returned state will not + * apply TTL to the passed values, regardless of the TTL settings. This prevents double + * applying of TTL (recovered values are TTL values if TTL was enabled). The state will, + * however, use TTL serializer if TTL is enabled. WARN: only valid during the recovery. + * @throws UnsupportedOperationException if state type is not supported + */ + public ChangelogState getExistingState(String name, StateMetaInfoSnapshot.BackendStateType type) + throws UnsupportedOperationException { + ChangelogState state; + switch (type) { + case KEY_VALUE: + state = changelogStates.get(name); + break; + case PRIORITY_QUEUE: + state = priorityQueueStatesByName.get(name); + break; + default: + throw new UnsupportedOperationException( + String.format("Unknown state type %s (%s)", type, name)); + } + return state; + } + + public void resetAllWritingMetaFlags() { + for (ChangelogState changelogState : changelogStates.values()) { + changelogState.resetWritingMetaFlag(); + } + + for (ChangelogKeyGroupedPriorityQueue<?> priorityQueueState : + priorityQueueStatesByName.values()) { + priorityQueueState.resetWritingMetaFlag(); + } + } + + public void dispose() { + changelogStates.clear(); + priorityQueueStatesByName.clear(); + } + + private <S extends State, V> StateFactory getStateFactory( + StateDescriptor<S, V> stateDescriptor) { + StateFactory stateFactory = STATE_FACTORIES.get(stateDescriptor.getType()); + if (stateFactory == null) { + String message = + String.format( + "State %s is not supported by %s", + stateDescriptor.getClass(), ChangelogKeyedStateBackend.class); + throw new FlinkRuntimeException(message); + } + return stateFactory; + } + + private static class VoidStateChangeLogger<Value, Namespace> + implements KvStateChangeLogger<Value, Namespace>, StateChangeLogger<Value, Namespace> { Review Comment: This logger is only used by `ChangelogMigrationRestoreTarget`, right? If so, I'd move it there and inline the methods that are using it (`create`). ########## 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) { + + @Override + public void setCurrentKey(K newKey) { + keyedStateBackend.setCurrentKey(newKey); + } + + @Override + public void notifyCheckpointComplete(long checkpointId) throws Exception { + keyedStateBackend.notifyCheckpointComplete(checkpointId); + } + + @Nonnull + @Override + public SavepointResources<K> savepoint() throws Exception { + return keyedStateBackend.savepoint(); + } + + @Override + public int numKeyValueStateEntries() { + return keyedStateBackend.numKeyValueStateEntries(); + } + + @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); + } + + @Nonnull + @Override + public <N, SV, SEV, S extends State, IS extends S> IS createInternalState( + @Nonnull TypeSerializer<N> namespaceSerializer, + @Nonnull StateDescriptor<S, SV> stateDesc, + @Nonnull + StateSnapshotTransformer.StateSnapshotTransformFactory<SEV> + snapshotTransformFactory) + throws Exception { + return keyedStateBackend.createInternalState( + namespaceSerializer, stateDesc, snapshotTransformFactory); + } + + @Override + public <N, S extends State> S getPartitionedState( + N namespace, + TypeSerializer<N> namespaceSerializer, + StateDescriptor<S, ?> stateDescriptor) + throws Exception { + S partitionedState = + keyedStateBackend.getPartitionedState( + namespace, namespaceSerializer, stateDescriptor); + functionDelegationHelper.addOrUpdate(stateDescriptor); + return partitionedState; + } + + @Override + public <N, S extends State, V> S getOrCreateKeyedState( + TypeSerializer<N> namespaceSerializer, StateDescriptor<S, V> stateDescriptor) + throws Exception { + S keyedState = + keyedStateBackend.getOrCreateKeyedState( + namespaceSerializer, stateDescriptor); + functionDelegationHelper.addOrUpdate(stateDescriptor); + return keyedState; + } + + @Nonnull + @Override + @SuppressWarnings("unchecked") + public <T extends HeapPriorityQueueElement & PriorityComparable<? super T> & Keyed<?>> + KeyGroupedInternalPriorityQueue<T> create( + @Nonnull String stateName, + @Nonnull TypeSerializer<T> byteOrderedElementSerializer) { + ChangelogKeyGroupedPriorityQueue<T> existingState = + (ChangelogKeyGroupedPriorityQueue<T>) + changelogStateFactory.getExistingState( + stateName, + StateMetaInfoSnapshot.BackendStateType.PRIORITY_QUEUE); + return existingState == null + ? keyedStateBackend.create(stateName, byteOrderedElementSerializer) + : existingState; + } + + @Nonnull + @Override + public RunnableFuture<SnapshotResult<KeyedStateHandle>> snapshot( + long checkpointId, + long timestamp, + @Nonnull CheckpointStreamFactory streamFactory, + @Nonnull CheckpointOptions checkpointOptions) + throws Exception { + return keyedStateBackend.snapshot( + checkpointId, timestamp, streamFactory, checkpointOptions); + } + + @Override + public void dispose() { + super.dispose(); + changelogStateFactory.dispose(); Review Comment: Why it is not `keyedStateBackend.dispose()`, by analogy with other methods? 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