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 org.apache.hadoop.classification.InterfaceAudience;
22 import org.apache.hadoop.classification.InterfaceStability;
23
24 /**
25 * A more restricted interface for HStore. Only gives the caller access to information
26 * about store configuration/settings that cannot easily be obtained from XML config object.
27 * Example user would be CompactionPolicy that doesn't need entire (H)Store, only this.
28 * Add things here as needed.
29 */
30 @InterfaceAudience.Private
31 @InterfaceStability.Unstable
32 public interface StoreConfigInformation {
33 /**
34 * TODO: remove after HBASE-7252 is fixed.
35 * @return Gets the Memstore flush size for the region that this store works with.
36 */
37 long getMemstoreFlushSize();
38
39 /**
40 * @return Gets the cf-specific time-to-live for store files.
41 */
42 long getStoreFileTtl();
43
44 /**
45 * @return Gets the cf-specific compaction check frequency multiplier.
46 * The need for compaction (outside of normal checks during flush, open, etc.) will
47 * be ascertained every multiplier * HConstants.THREAD_WAKE_FREQUENCY milliseconds.
48 */
49 long getCompactionCheckMultiplier();
50
51 /**
52 * The number of files required before flushes for this store will be blocked.
53 */
54 long getBlockingFileCount();
55 }