yifan-c commented on code in PR #4399: URL: https://github.com/apache/cassandra/pull/4399#discussion_r2427264076
########## src/java/org/apache/cassandra/db/compression/ManualTrainingOptions.java: ########## @@ -0,0 +1,80 @@ +/* + * 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.cassandra.db.compression; + +import java.util.Map; + +/** + * Configuration options for manual compression dictionary training. + * This class encapsulates the parsed and validated parameters needed for training. + */ +public class ManualTrainingOptions +{ + private final int maxSamplingDurationSeconds; + + public ManualTrainingOptions(int maxSamplingDurationSeconds) + { + if (maxSamplingDurationSeconds <= 0) + { + throw new IllegalArgumentException("maxSamplingDurationSeconds must be positive, got: " + maxSamplingDurationSeconds); + } + this.maxSamplingDurationSeconds = maxSamplingDurationSeconds; + } + + /** + * Parse options from a string map, typically from JMX/MBean calls. + * + * @param options the string map containing training options + * @return parsed and validated ManualTrainingOptions + * @throws IllegalArgumentException if required parameters are missing or invalid + */ + public static ManualTrainingOptions fromStringMap(Map<String, String> options) + { + if (options == null || !options.containsKey("maxSamplingDurationSeconds")) + { + throw new IllegalArgumentException("maxSamplingDurationSeconds parameter is required for manual dictionary training"); Review Comment: Stefan, please check out https://github.com/apache/cassandra/commit/f7a66b47f382ade1fb689135056e2690f128a136 first. The sstable sampling is already implemented in this commit. It basically does random sampling across all data on disk. What it does not have is running 'flush' in advance. -- 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] --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
