LiebingYu commented on code in PR #2769: URL: https://github.com/apache/fluss/pull/2769#discussion_r3032497065
########## fluss-server/src/main/java/org/apache/fluss/server/coordinator/remote/RemoteDirDynamicLoader.java: ########## @@ -0,0 +1,167 @@ +/* + * 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.fluss.server.coordinator.remote; + +import org.apache.fluss.config.ConfigOption; +import org.apache.fluss.config.ConfigOptions; +import org.apache.fluss.config.Configuration; +import org.apache.fluss.config.cluster.ServerReconfigurable; +import org.apache.fluss.exception.ConfigException; +import org.apache.fluss.exception.IllegalConfigurationException; + +import java.util.HashSet; +import java.util.List; +import java.util.Objects; +import java.util.Optional; +import java.util.Set; + +import static org.apache.fluss.config.FlussConfigUtils.validateRemoteDataDirs; + +/** + * Dynamic loader for remote data directories that supports runtime reconfiguration. + * + * <p>This class manages the lifecycle of remote data directories and provides a selector for + * selecting remote data directories. It implements {@link ServerReconfigurable} to support dynamic + * configuration updates at runtime without requiring a server restart. + * + * <p>When creating a new table or partition, the coordinator server uses this loader to select an + * appropriate remote data directory based on the configured selection strategy (see {@link + * org.apache.fluss.config.ConfigOptions#REMOTE_DATA_DIRS_STRATEGY}). + */ +public class RemoteDirDynamicLoader implements ServerReconfigurable, AutoCloseable { + + private volatile RemoteDirSelector remoteDirSelector; + private Configuration currentConfiguration; + + public RemoteDirDynamicLoader(Configuration configuration) { + this.currentConfiguration = configuration; + this.remoteDirSelector = createRemoteDirSelector(configuration); + } + + public RemoteDirSelector getRemoteDirSelector() { + return remoteDirSelector; + } + + @Override + public void validate(Configuration newConfig) throws ConfigException { + // Validate new remote data dirs contain all old remote data dirs + Optional<List<String>> newRemoteDataDirsOp = + newConfig.getOptional(ConfigOptions.REMOTE_DATA_DIRS); + if (newRemoteDataDirsOp.isPresent()) { + List<String> oldRemoteDataDirs = + currentConfiguration.get(ConfigOptions.REMOTE_DATA_DIRS); + Set<String> newRemoteDataDirs = new HashSet<>(newRemoteDataDirsOp.get()); + if (!newRemoteDataDirs.containsAll(oldRemoteDataDirs)) { + throw new ConfigException( + String.format( + "New %s: %s must contain all old %s: %s. " + + "If you want the Fluss cluster to stop transferring data to a certain path, " + + "keep it in %s and set its weight to 0 in %s.", + ConfigOptions.REMOTE_DATA_DIRS.key(), + newRemoteDataDirsOp.get(), + ConfigOptions.REMOTE_DATA_DIRS.key(), + oldRemoteDataDirs, + ConfigOptions.REMOTE_DATA_DIRS.key(), + ConfigOptions.REMOTE_DATA_DIRS_WEIGHTS.key())); + } + } + + Configuration mergedConfig = mergeConfigurations(currentConfiguration, newConfig); + try { + validateRemoteDataDirs(mergedConfig); + } catch (IllegalConfigurationException e) { + throw new ConfigException(e.getMessage()); + } + } + + @Override + public void reconfigure(Configuration newConfig) throws ConfigException { + if (strategyChanged(newConfig) + || remoteDataDirsChanged(newConfig) + || weightsChanged(newConfig)) { + // Create a new container with the merged configuration + Configuration mergedConfig = mergeConfigurations(currentConfiguration, newConfig); + this.remoteDirSelector = createRemoteDirSelector(mergedConfig); + this.currentConfiguration = mergedConfig; + } + } + + private RemoteDirSelector createRemoteDirSelector(Configuration conf) { + ConfigOptions.RemoteDataDirStrategy strategy = + conf.get(ConfigOptions.REMOTE_DATA_DIRS_STRATEGY); + String remoteDataDir = conf.get(ConfigOptions.REMOTE_DATA_DIR); + List<String> remoteDataDirs = conf.get(ConfigOptions.REMOTE_DATA_DIRS); + List<Integer> weights = conf.get(ConfigOptions.REMOTE_DATA_DIRS_WEIGHTS); + + switch (strategy) { + case ROUND_ROBIN: + return new RoundRobinRemoteDirSelector(remoteDataDir, remoteDataDirs); + case WEIGHTED_ROUND_ROBIN: + return new WeightedRoundRobinRemoteDirSelector( + remoteDataDir, remoteDataDirs, weights); + default: + throw new IllegalArgumentException( + "Unsupported remote data directory select strategy: " + strategy); + } + } + + private boolean strategyChanged(Configuration newConfig) { + return hasConfigChanged(newConfig, ConfigOptions.REMOTE_DATA_DIRS_STRATEGY); + } + + private boolean remoteDataDirsChanged(Configuration newConfig) { + return hasConfigChanged(newConfig, ConfigOptions.REMOTE_DATA_DIRS); + } + + private boolean weightsChanged(Configuration newConfig) { + return hasConfigChanged(newConfig, ConfigOptions.REMOTE_DATA_DIRS_WEIGHTS); + } + + /** + * Checks if a specific configuration option has changed in the new config. + * + * @param newConfig the new configuration + * @param option the configuration option to check + * @param <T> the type of the configuration value + * @return true if the configuration has changed + */ + private <T> boolean hasConfigChanged(Configuration newConfig, ConfigOption<T> option) { + return newConfig + .getOptional(option) + .map(newValue -> !Objects.equals(newValue, currentConfiguration.get(option))) + .orElse(false); Review Comment: No deletions. -- 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: [email protected] For queries about this service, please contact Infrastructure at: [email protected]
