| /** |
| * |
| * 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.util; |
| |
| import com.codahale.metrics.Histogram; |
| import com.codahale.metrics.Reservoir; |
| import com.codahale.metrics.Snapshot; |
| |
| import java.lang.reflect.Constructor; |
| import java.text.DecimalFormat; |
| |
| /** Utility functions for working with Yammer Metrics. */ |
| public final class YammerHistogramUtils { |
| |
| // not for public consumption |
| private YammerHistogramUtils() {} |
| |
| /** |
| * Used formatting doubles so only two places after decimal point. |
| */ |
| private static DecimalFormat DOUBLE_FORMAT = new DecimalFormat("#0.00"); |
| |
| /** |
| * Create a new {@link com.codahale.metrics.Histogram} instance. These constructors are |
| * not public in 2.2.0, so we use reflection to find them. |
| */ |
| public static Histogram newHistogram(Reservoir sample) { |
| try { |
| Constructor<?> ctor = |
| Histogram.class.getDeclaredConstructor(Reservoir.class); |
| ctor.setAccessible(true); |
| return (Histogram) ctor.newInstance(sample); |
| } catch (Exception e) { |
| throw new RuntimeException(e); |
| } |
| } |
| |
| /** @return an abbreviated summary of {@code hist}. */ |
| public static String getShortHistogramReport(final Histogram hist) { |
| Snapshot sn = hist.getSnapshot(); |
| return "mean=" + DOUBLE_FORMAT.format(sn.getMean()) + |
| ", min=" + DOUBLE_FORMAT.format(sn.getMin()) + |
| ", max=" + DOUBLE_FORMAT.format(sn.getMax()) + |
| ", stdDev=" + DOUBLE_FORMAT.format(sn.getStdDev()) + |
| ", 95th=" + DOUBLE_FORMAT.format(sn.get95thPercentile()) + |
| ", 99th=" + DOUBLE_FORMAT.format(sn.get99thPercentile()); |
| } |
| |
| /** @return a summary of {@code hist}. */ |
| public static String getHistogramReport(final Histogram hist) { |
| Snapshot sn = hist.getSnapshot(); |
| return "mean=" + DOUBLE_FORMAT.format(sn.getMean()) + |
| ", min=" + DOUBLE_FORMAT.format(sn.getMin()) + |
| ", max=" + DOUBLE_FORMAT.format(sn.getMax()) + |
| ", stdDev=" + DOUBLE_FORMAT.format(sn.getStdDev()) + |
| ", 50th=" + DOUBLE_FORMAT.format(sn.getMedian()) + |
| ", 75th=" + DOUBLE_FORMAT.format(sn.get75thPercentile()) + |
| ", 95th=" + DOUBLE_FORMAT.format(sn.get95thPercentile()) + |
| ", 99th=" + DOUBLE_FORMAT.format(sn.get99thPercentile()) + |
| ", 99.9th=" + DOUBLE_FORMAT.format(sn.get999thPercentile()) + |
| ", 99.99th=" + DOUBLE_FORMAT.format(sn.getValue(0.9999)) + |
| ", 99.999th=" + DOUBLE_FORMAT.format(sn.getValue(0.99999)); |
| } |
| |
| /** @return pretty summary of {@code hist}. */ |
| public static String getPrettyHistogramReport(final Histogram h) { |
| Snapshot sn = h.getSnapshot(); |
| return |
| "Mean = " + DOUBLE_FORMAT.format(sn.getMean()) + "\n" + |
| "Min = " + DOUBLE_FORMAT.format(sn.getMin()) + "\n" + |
| "Max = " + DOUBLE_FORMAT.format(sn.getMax()) + "\n" + |
| "StdDev = " + DOUBLE_FORMAT.format(sn.getStdDev()) + "\n" + |
| "50th = " + DOUBLE_FORMAT.format(sn.getMedian()) + "\n" + |
| "75th = " + DOUBLE_FORMAT.format(sn.get75thPercentile()) + "\n" + |
| "95th = " + DOUBLE_FORMAT.format(sn.get95thPercentile()) + "\n" + |
| "99th = " + DOUBLE_FORMAT.format(sn.get99thPercentile()) + "\n" + |
| "99.9th = " + DOUBLE_FORMAT.format(sn.get999thPercentile()) + "\n" + |
| "99.99th = " + DOUBLE_FORMAT.format(sn.getValue(0.9999)) + "\n" + |
| "99.999th = " + DOUBLE_FORMAT.format(sn.getValue(0.99999)); |
| } |
| } |