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.yetus.audience.InterfaceStability;
023
024/**
025 * A more restricted interface for HStore. Only gives the caller access to information
026 * about store configuration/settings that cannot easily be obtained from XML config object.
027 * Example user would be CompactionPolicy that doesn't need entire (H)Store, only this.
028 * Add things here as needed.
029 */
030@InterfaceAudience.Private
031@InterfaceStability.Unstable
032public interface StoreConfigInformation {
033  /**
034   * @return Gets the Memstore flush size for the region that this store works with.
035   */
036  // TODO: Why is this in here?  It should be in Store and it should return the Store flush size,
037  // not the Regions.  St.Ack
038  long getMemStoreFlushSize();
039
040  /**
041   * @return Gets the cf-specific time-to-live for store files.
042   */
043  long getStoreFileTtl();
044
045  /**
046   * @return Gets the cf-specific compaction check frequency multiplier.
047   *         The need for compaction (outside of normal checks during flush, open, etc.) will
048   *         be ascertained every multiplier * HConstants.THREAD_WAKE_FREQUENCY milliseconds.
049   */
050  long getCompactionCheckMultiplier();
051
052  /**
053   * The number of files required before flushes for this store will be blocked.
054   */
055  long getBlockingFileCount();
056}