001/* 002 * Licensed to the Apache Software Foundation (ASF) under one 003 * or more contributor license agreements. See the NOTICE file 004 * distributed with this work for additional information 005 * regarding copyright ownership. The ASF licenses this file 006 * to you under the Apache License, Version 2.0 (the 007 * "License"); you may not use this file except in compliance 008 * with the License. You may obtain a copy of the License at 009 * 010 * http://www.apache.org/licenses/LICENSE-2.0 011 * 012 * Unless required by applicable law or agreed to in writing, software 013 * distributed under the License is distributed on an "AS IS" BASIS, 014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 015 * See the License for the specific language governing permissions and 016 * limitations under the License. 017 */ 018package org.apache.hadoop.hbase.regionserver.throttle; 019 020import java.util.concurrent.atomic.AtomicInteger; 021import org.apache.hadoop.hbase.regionserver.HStore; 022import org.apache.yetus.audience.InterfaceAudience; 023 024/** 025 * Helper methods for throttling 026 */ 027@InterfaceAudience.Private 028public final class ThroughputControlUtil { 029 private ThroughputControlUtil() { 030 } 031 032 private static final AtomicInteger NAME_COUNTER = new AtomicInteger(0); 033 private static final String NAME_DELIMITER = "#"; 034 035 /** 036 * Generate a name for throttling, to prevent name conflict when multiple IO operation running 037 * parallel on the same store. 038 * @param store the Store instance on which IO operation is happening 039 * @param opName Name of the IO operation, e.g. "flush", "compaction", etc. 040 * @return The name for throttling 041 */ 042 public static String getNameForThrottling(HStore store, String opName) { 043 int counter; 044 for (;;) { 045 counter = NAME_COUNTER.get(); 046 int next = counter == Integer.MAX_VALUE ? 0 : counter + 1; 047 if (NAME_COUNTER.compareAndSet(counter, next)) { 048 break; 049 } 050 } 051 return store.getRegionInfo().getEncodedName() + NAME_DELIMITER 052 + store.getColumnFamilyDescriptor().getNameAsString() + NAME_DELIMITER + opName 053 + NAME_DELIMITER + counter; 054 } 055}