1 /** 2 * 3 * Licensed to the Apache Software Foundation (ASF) under one 4 * or more contributor license agreements. See the NOTICE file 5 * distributed with this work for additional information 6 * regarding copyright ownership. The ASF licenses this file 7 * to you under the Apache License, Version 2.0 (the 8 * "License"); you may not use this file except in compliance 9 * with the License. You may obtain a copy of the License at 10 * 11 * http://www.apache.org/licenses/LICENSE-2.0 12 * 13 * Unless required by applicable law or agreed to in writing, software 14 * distributed under the License is distributed on an "AS IS" BASIS, 15 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 16 * See the License for the specific language governing permissions and 17 * limitations under the License. 18 */ 19 package org.apache.hadoop.hbase.regionserver; 20 21 import java.io.IOException; 22 import java.util.List; 23 24 import org.apache.hadoop.hbase.classification.InterfaceAudience; 25 import org.apache.hadoop.hbase.client.Scan; 26 27 /** 28 * Scanner scans the MOB Store. Coalesce KeyValue stream into List<KeyValue> 29 * for a single row. It's only used in the compaction of mob-enabled columns. 30 * It outputs the normal cells and delete markers when outputDeleteMarkers is set as true. 31 */ 32 @InterfaceAudience.Private 33 public class MobCompactionStoreScanner extends StoreScanner { 34 35 /* 36 * The delete markers are probably contained in the output of the scanner, for instance the 37 * minor compaction. If outputDeleteMarkers is set as true, these delete markers could be 38 * written to the del file, otherwise it's not allowed. 39 */ 40 protected boolean outputDeleteMarkers; 41 42 /** 43 * Used for compactions.<p> 44 * 45 * Opens a scanner across specified StoreFiles. 46 * @param store who we scan 47 * @param scan the spec 48 * @param scanners ancillary scanners 49 * @param smallestReadPoint the readPoint that we should use for tracking 50 * versions 51 */ 52 public MobCompactionStoreScanner(Store store, ScanInfo scanInfo, Scan scan, 53 List<? extends KeyValueScanner> scanners, ScanType scanType, long smallestReadPoint, 54 long earliestPutTs, boolean outputDeleteMarkers) throws IOException { 55 super(store, scanInfo, scan, scanners, scanType, smallestReadPoint, earliestPutTs); 56 this.outputDeleteMarkers = outputDeleteMarkers; 57 } 58 59 /** 60 * Gets whether the delete markers could be written to the del files. 61 * @return True if the delete markers could be written del files, false if it's not allowed. 62 */ 63 public boolean isOutputDeleteMarkers() { 64 return this.outputDeleteMarkers; 65 } 66 }