001/**
002 *
003 * Licensed to the Apache Software Foundation (ASF) under one
004 * or more contributor license agreements.  See the NOTICE file
005 * distributed with this work for additional information
006 * regarding copyright ownership.  The ASF licenses this file
007 * to you under the Apache License, Version 2.0 (the
008 * "License"); you may not use this file except in compliance
009 * with the License.  You may obtain a copy of the License at
010 *
011 *     http://www.apache.org/licenses/LICENSE-2.0
012 *
013 * Unless required by applicable law or agreed to in writing, software
014 * distributed under the License is distributed on an "AS IS" BASIS,
015 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
016 * See the License for the specific language governing permissions and
017 * limitations under the License.
018 */
019package org.apache.hadoop.hbase.regionserver;
020
021import org.apache.yetus.audience.InterfaceAudience;
022import org.apache.hadoop.hbase.util.ClassSize;
023
024/**
025 * CSLMImmutableSegment is an abstract class that extends the API supported by a {@link Segment},
026 * and {@link ImmutableSegment}. This immutable segment is working with CellSet with
027 * ConcurrentSkipListMap (CSLM) delegatee.
028 */
029@InterfaceAudience.Private
030public class CSLMImmutableSegment extends ImmutableSegment {
031  public static final long DEEP_OVERHEAD_CSLM =
032      ImmutableSegment.DEEP_OVERHEAD + ClassSize.CONCURRENT_SKIPLISTMAP;
033
034  /**------------------------------------------------------------------------
035   * Copy C-tor to be used when new CSLMImmutableSegment is being built from a Mutable one.
036   * This C-tor should be used when active MutableSegment is pushed into the compaction
037   * pipeline and becomes an ImmutableSegment.
038   */
039  protected CSLMImmutableSegment(Segment segment, MemStoreSizing memstoreSizing) {
040    super(segment);
041    // update the segment metadata heap size
042    long indexOverhead = -MutableSegment.DEEP_OVERHEAD + DEEP_OVERHEAD_CSLM;
043    incMemStoreSize(0, indexOverhead, 0, 0); // CSLM is always on-heap
044    if (memstoreSizing != null) {
045      memstoreSizing.incMemStoreSize(0, indexOverhead, 0, 0);
046    }
047  }
048
049  @Override
050  protected long indexEntrySize() {
051    return ClassSize.CONCURRENT_SKIPLISTMAP_ENTRY;
052  }
053
054  @Override protected boolean canBeFlattened() {
055    return true;
056  }
057}