/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.hadoop.hbase.regionserver.throttle;
import java.util.concurrent.atomic.AtomicInteger;
import org.apache.hadoop.hbase.classification.InterfaceAudience;
import org.apache.hadoop.hbase.regionserver.Store;
/**
* Helper methods for throttling
*/
@InterfaceAudience.Private
public final class ThroughputControlUtil {
private ThroughputControlUtil() {
}
private static final AtomicInteger NAME_COUNTER = new AtomicInteger(0);
private static final String NAME_DELIMITER = "#";
/**
* Generate a name for throttling, to prevent name conflict when multiple IO operation running
* parallel on the same store.
* @param store the Store instance on which IO operation is happening
* @param opName Name of the IO operation, e.g. "flush", "compaction", etc.
* @return The name for throttling
*/
public static String getNameForThrottling(final Store store, final String opName) {
int counter;
for (;;) {
counter = NAME_COUNTER.get();
int next = counter == Integer.MAX_VALUE ? 0 : counter + 1;
if (NAME_COUNTER.compareAndSet(counter, next)) {
break;
}
}
return store.getRegionInfo().getRegionNameAsString() + NAME_DELIMITER
+ store.getFamily().getNameAsString() + NAME_DELIMITER + opName + NAME_DELIMITER + counter;
}
}