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.throttle;
19
20 import java.util.concurrent.atomic.AtomicInteger;
21
22 import org.apache.hadoop.hbase.classification.InterfaceAudience;
23 import org.apache.hadoop.hbase.regionserver.Store;
24
25 /**
26 * Helper methods for throttling
27 */
28 @InterfaceAudience.Private
29 public final class ThroughputControlUtil {
30 private ThroughputControlUtil() {
31 }
32
33 private static final AtomicInteger NAME_COUNTER = new AtomicInteger(0);
34 private static final String NAME_DELIMITER = "#";
35
36 /**
37 * Generate a name for throttling, to prevent name conflict when multiple IO operation running
38 * parallel on the same store.
39 * @param store the Store instance on which IO operation is happening
40 * @param opName Name of the IO operation, e.g. "flush", "compaction", etc.
41 * @return The name for throttling
42 */
43 public static String getNameForThrottling(final Store store, final String opName) {
44 int counter;
45 for (;;) {
46 counter = NAME_COUNTER.get();
47 int next = counter == Integer.MAX_VALUE ? 0 : counter + 1;
48 if (NAME_COUNTER.compareAndSet(counter, next)) {
49 break;
50 }
51 }
52 return store.getRegionInfo().getRegionNameAsString() + NAME_DELIMITER
53 + store.getFamily().getNameAsString() + NAME_DELIMITER + opName + NAME_DELIMITER + counter;
54 }
55 }