yangjiandan commented on code in PR #7527: URL: https://github.com/apache/hadoop/pull/7527#discussion_r2009375263
########## hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/util/ExpiringCache.java: ########## @@ -0,0 +1,107 @@ +/** + * 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.hadoop.util; + +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + +import java.util.Map; +import java.util.Timer; +import java.util.TimerTask; +import java.util.concurrent.ConcurrentHashMap; + +/** + * A thread-safe cache with automatic expiration and cleanup. + */ +public class ExpiringCache <K, V> { Review Comment: It's a good suggestion. Caffeine is indeed a robust and high-performance caching library. However, since Hadoop already depends on Guava, using Guava’s Cache instead of introducing a new dependency maybe a good choice. Guava provides a CacheBuilder and LoadingCache that can fulfill our needs for automatic expiration, cleanup, and concurrency. -- 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: common-issues-unsubscr...@hadoop.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org --------------------------------------------------------------------- To unsubscribe, e-mail: common-issues-unsubscr...@hadoop.apache.org For additional commands, e-mail: common-issues-h...@hadoop.apache.org
