StefanRRichter commented on a change in pull request #7674: [FLINK-10043] [State Backends] Refactor RocksDBKeyedStateBackend object construction/initialization/restore code URL: https://github.com/apache/flink/pull/7674#discussion_r257685356
########## File path: flink-state-backends/flink-statebackend-rocksdb/src/main/java/org/apache/flink/contrib/streaming/state/restore/RocksDBIncrementalRestoreOperation.java ########## @@ -0,0 +1,582 @@ +/* + * 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.contrib.streaming.state.restore; + +import org.apache.flink.api.common.typeutils.TypeSerializerSchemaCompatibility; +import org.apache.flink.configuration.ConfigConstants; +import org.apache.flink.contrib.streaming.state.RocksDBIncrementalCheckpointUtils; +import org.apache.flink.contrib.streaming.state.RocksDBKeySerializationUtils; +import org.apache.flink.contrib.streaming.state.RocksDBKeyedStateBackend; +import org.apache.flink.contrib.streaming.state.RocksDBNativeMetricMonitor; +import org.apache.flink.contrib.streaming.state.RocksDBOperationUtils; +import org.apache.flink.contrib.streaming.state.RocksDBStateDownloader; +import org.apache.flink.contrib.streaming.state.RocksDBWriteBatchWrapper; +import org.apache.flink.contrib.streaming.state.RocksIteratorWrapper; +import org.apache.flink.contrib.streaming.state.StateColumnFamilyHandle; +import org.apache.flink.core.fs.CloseableRegistry; +import org.apache.flink.core.fs.FSDataInputStream; +import org.apache.flink.core.fs.FileStatus; +import org.apache.flink.core.fs.FileSystem; +import org.apache.flink.core.fs.Path; +import org.apache.flink.core.memory.DataInputView; +import org.apache.flink.core.memory.DataInputViewStreamWrapper; +import org.apache.flink.runtime.state.BackendBuildingException; +import org.apache.flink.runtime.state.DirectoryStateHandle; +import org.apache.flink.runtime.state.IncrementalKeyedStateHandle; +import org.apache.flink.runtime.state.IncrementalLocalKeyedStateHandle; +import org.apache.flink.runtime.state.KeyGroupRange; +import org.apache.flink.runtime.state.KeyedBackendSerializationProxy; +import org.apache.flink.runtime.state.KeyedStateHandle; +import org.apache.flink.runtime.state.RegisteredStateMetaInfoBase; +import org.apache.flink.runtime.state.StateSerializerProvider; +import org.apache.flink.runtime.state.StreamStateHandle; +import org.apache.flink.runtime.state.metainfo.StateMetaInfoSnapshot; +import org.apache.flink.util.IOUtils; +import org.apache.flink.util.StateMigrationException; + +import org.rocksdb.ColumnFamilyDescriptor; +import org.rocksdb.ColumnFamilyHandle; +import org.rocksdb.ColumnFamilyOptions; +import org.rocksdb.DBOptions; +import org.rocksdb.RocksDB; +import org.rocksdb.RocksDBException; +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + +import javax.annotation.Nonnull; + +import java.io.File; +import java.io.IOException; +import java.nio.file.Files; +import java.nio.file.StandardCopyOption; +import java.util.ArrayList; +import java.util.Collection; +import java.util.List; +import java.util.Map; +import java.util.Objects; +import java.util.UUID; + +import static org.apache.flink.contrib.streaming.state.snapshot.RocksSnapshotUtil.SST_FILE_SUFFIX; + +/** + * Encapsulates the process of restoring a RocksDB instance from an incremental snapshot. + */ +public class RocksDBIncrementalRestoreOperation<K> extends AbstractRocksDBRestoreOperation<K> { + private static final Logger LOG = LoggerFactory.getLogger(RocksDBIncrementalRestoreOperation.class); + + private final String operatorIdentifier; + private boolean isKeySerializerCompatibilityChecked; + + public RocksDBIncrementalRestoreOperation(String operatorIdentifier, + KeyGroupRange keyGroupRange, + int keyGroupPrefixBytes, + int numberOfTransferringThreads, + CloseableRegistry cancelStreamRegistry, + ClassLoader userCodeClassLoader, + Map<String, StateColumnFamilyHandle> kvStateInformation, + StateSerializerProvider<K> keySerializerProvider, + File instanceBasePath, + File instanceRocksDBPath, + DBOptions dbOptions, + ColumnFamilyOptions columnOptions, + RocksDBNativeMetricMonitor nativeMetricMonitor) { + super(keyGroupRange, + keyGroupPrefixBytes, + numberOfTransferringThreads, + cancelStreamRegistry, + userCodeClassLoader, + kvStateInformation, + keySerializerProvider, + instanceBasePath, + instanceRocksDBPath, + dbOptions, + columnOptions, + nativeMetricMonitor); + this.operatorIdentifier = operatorIdentifier; + } + + /** + * Root method that branches for different implementations of {@link KeyedStateHandle}. + */ + @Override + public RocksDBRestoreResult restore(Collection<KeyedStateHandle> restoreStateHandles, RocksDB db) throws Exception { + + if (restoreStateHandles == null || restoreStateHandles.isEmpty()) { + return null; + } + + final KeyedStateHandle theFirstStateHandle = restoreStateHandles.iterator().next(); + + boolean isRescaling = (restoreStateHandles.size() > 1 || + !Objects.equals(theFirstStateHandle.getKeyGroupRange(), keyGroupRange)); + + if (!isRescaling) { Review comment: nit: could change to order of the branches to avoid the negation ---------------------------------------------------------------- This is an automated message from the Apache Git Service. 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