| /* |
| * 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.io.hfile.bucket; |
| |
| import java.util.concurrent.TimeUnit; |
| import java.util.concurrent.atomic.LongAdder; |
| import org.apache.hadoop.hbase.io.hfile.CacheStats; |
| import org.apache.hadoop.hbase.util.EnvironmentEdgeManager; |
| import org.apache.yetus.audience.InterfaceAudience; |
| |
| /** |
| * Class that implements cache metrics for bucket cache. |
| */ |
| @InterfaceAudience.Private |
| public class BucketCacheStats extends CacheStats { |
| private final LongAdder ioHitCount = new LongAdder(); |
| private final LongAdder ioHitTime = new LongAdder(); |
| private static final long NANO_TIME = TimeUnit.MILLISECONDS.toNanos(1); |
| private long lastLogTime = EnvironmentEdgeManager.currentTime(); |
| |
| /* Tracing failed Bucket Cache allocations. */ |
| private LongAdder allocationFailCount = new LongAdder(); |
| |
| BucketCacheStats() { |
| super("BucketCache"); |
| |
| allocationFailCount.reset(); |
| } |
| |
| @Override |
| public String toString() { |
| return super.toString() + ", ioHitsPerSecond=" + getIOHitsPerSecond() + ", ioTimePerHit=" |
| + getIOTimePerHit() + ", allocationFailCount=" + getAllocationFailCount(); |
| } |
| |
| public void ioHit(long time) { |
| ioHitCount.increment(); |
| ioHitTime.add(time); |
| } |
| |
| public long getIOHitsPerSecond() { |
| long now = EnvironmentEdgeManager.currentTime(); |
| long took = (now - lastLogTime) / 1000; |
| lastLogTime = now; |
| return took == 0 ? 0 : ioHitCount.sum() / took; |
| } |
| |
| public double getIOTimePerHit() { |
| long time = ioHitTime.sum() / NANO_TIME; |
| long count = ioHitCount.sum(); |
| return ((float) time / (float) count); |
| } |
| |
| public void reset() { |
| ioHitCount.reset(); |
| ioHitTime.reset(); |
| allocationFailCount.reset(); |
| } |
| |
| public long getAllocationFailCount() { |
| return allocationFailCount.sum(); |
| } |
| |
| public void allocationFailed() { |
| allocationFailCount.increment(); |
| } |
| } |