1 /**
2 * Licensed to the Apache Software Foundation (ASF) under one
3 * or more contributor license agreements. See the NOTICE file
4 * distributed with this work for additional information
5 * regarding copyright ownership. The ASF licenses this file
6 * to you under the Apache License, Version 2.0 (the
7 * "License"); you may not use this file except in compliance
8 * with the License. You may obtain a copy of the License at
9 *
10 * http://www.apache.org/licenses/LICENSE-2.0
11 *
12 * Unless required by applicable law or agreed to in writing, software
13 * distributed under the License is distributed on an "AS IS" BASIS,
14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15 * See the License for the specific language governing permissions and
16 * limitations under the License.
17 */
18 package org.apache.hadoop.hbase.regionserver;
19
20 import org.apache.hadoop.classification.InterfaceAudience;
21 import org.apache.hadoop.conf.Configuration;
22 import org.apache.hadoop.hbase.HConstants;
23 import org.apache.hadoop.hbase.HTableDescriptor;
24
25 /**
26 * A {@link RegionSplitPolicy} implementation which splits a region
27 * as soon as any of its store files exceeds a maximum configurable
28 * size.
29 * <p>
30 * This is the default split policy. From 0.94.0 on the default split policy has
31 * changed to {@link IncreasingToUpperBoundRegionSplitPolicy}
32 * </p>
33 */
34 @InterfaceAudience.Private
35 public class ConstantSizeRegionSplitPolicy extends RegionSplitPolicy {
36 private long desiredMaxFileSize;
37
38 @Override
39 protected void configureForRegion(HRegion region) {
40 super.configureForRegion(region);
41 Configuration conf = getConf();
42 HTableDescriptor desc = region.getTableDesc();
43 if (desc != null) {
44 this.desiredMaxFileSize = desc.getMaxFileSize();
45 }
46 if (this.desiredMaxFileSize <= 0) {
47 this.desiredMaxFileSize = conf.getLong(HConstants.HREGION_MAX_FILESIZE,
48 HConstants.DEFAULT_MAX_FILE_SIZE);
49 }
50 }
51
52 @Override
53 protected boolean shouldSplit() {
54 boolean force = region.shouldForceSplit();
55 boolean foundABigStore = false;
56
57 for (Store store : region.getStores().values()) {
58 // If any of the stores are unable to split (eg they contain reference files)
59 // then don't split
60 if ((!store.canSplit())) {
61 return false;
62 }
63
64 // Mark if any store is big enough
65 if (store.getSize() > desiredMaxFileSize) {
66 foundABigStore = true;
67 }
68 }
69
70 return foundABigStore || force;
71 }
72
73 long getDesiredMaxFileSize() {
74 return desiredMaxFileSize;
75 }
76 }