taklwu commented on a change in pull request #3684: URL: https://github.com/apache/hbase/pull/3684#discussion_r710335335
########## File path: hbase-server/src/main/java/org/apache/hadoop/hbase/io/hfile/IndexOnlyLruBlockCache.java ########## @@ -0,0 +1,50 @@ +/* + * 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.hbase.io.hfile; + +import org.apache.hadoop.conf.Configuration; +import org.apache.yetus.audience.InterfaceAudience; + +/** + * An on heap block cache implementation extended LruBlockCache and only cache index block. + * This block cache should be only used by + * {@link org.apache.hadoop.hbase.client.ClientSideRegionScanner} that normally considers to be + * used by client resides out of the region server, e.g. a container of a map reduce job. + **/ [email protected] +public class IndexOnlyLruBlockCache extends LruBlockCache { + + public IndexOnlyLruBlockCache(long maxSize, long blockSize, boolean evictionThread, + Configuration conf) { + super(maxSize, blockSize, evictionThread, conf); + } + + /** + * Cache only index block with the specified name and buffer + * @param cacheKey block's cache key + * @param buf block buffer + * @param inMemory if block is in-memory + */ + @Override + public void cacheBlock(BlockCacheKey cacheKey, Cacheable buf, boolean inMemory) { + boolean isIndexBlock = buf.getBlockType().getCategory() != BlockType.BlockCategory.DATA; Review comment: ack and 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. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected]
