bharatviswa504 commented on a change in pull request #798: HDDS-1499. OzoneManager Cache. URL: https://github.com/apache/hadoop/pull/798#discussion_r282584180
########## File path: hadoop-hdds/common/src/main/java/org/apache/hadoop/utils/db/cache/PartialTableCache.java ########## @@ -0,0 +1,96 @@ +/* + * 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.utils.db.cache; + +import java.util.Iterator; +import java.util.TreeSet; +import java.util.concurrent.ConcurrentHashMap; +import java.util.concurrent.ExecutorService; +import java.util.concurrent.Executors; + +import org.apache.hadoop.classification.InterfaceAudience.Private; +import org.apache.hadoop.classification.InterfaceStability.Evolving; + + + +/** + * This is used for the tables where we don't want to cache entire table in + * in-memory. + */ +@Private +@Evolving +public class PartialTableCache<CACHEKEY, CACHEVALUE> + implements TableCache<CACHEKEY, CACHEVALUE>{ + + private final ConcurrentHashMap<CACHEKEY, CACHEVALUE> cache; + private final TreeSet<EpochEntry<CACHEKEY>> epochEntries; + private ExecutorService executorService; + + + + public PartialTableCache() { + cache = new ConcurrentHashMap<>(); + epochEntries = new TreeSet<EpochEntry<CACHEKEY>>(); + // Created a singleThreadExecutor, so one cleanup will be running at a + // time. + executorService = Executors.newSingleThreadExecutor(); + } + + @Override + public CACHEVALUE get(CACHEKEY cachekey) { + return cache.get(cachekey); + } + + @Override + public void put(CACHEKEY cacheKey, CACHEVALUE value) { + cache.put(cacheKey, value); + CacheValue cacheValue = (CacheValue) cache.get(cacheKey); Review comment: Done. ---------------------------------------------------------------- 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. For queries about this service, please contact Infrastructure at: us...@infra.apache.org With regards, Apache Git Services --------------------------------------------------------------------- To unsubscribe, e-mail: common-issues-unsubscr...@hadoop.apache.org For additional commands, e-mail: common-issues-h...@hadoop.apache.org
