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.metrics2.lib;
019
020import static org.junit.Assert.assertEquals;
021
022import java.util.ArrayList;
023import java.util.List;
024import org.apache.hadoop.hbase.HBaseClassTestRule;
025import org.apache.hadoop.hbase.testclassification.MetricsTests;
026import org.apache.hadoop.hbase.testclassification.SmallTests;
027import org.apache.hadoop.metrics2.AbstractMetric;
028import org.apache.hadoop.metrics2.MetricsRecord;
029import org.apache.hadoop.metrics2.impl.MetricsCollectorImpl;
030import org.junit.ClassRule;
031import org.junit.Test;
032import org.junit.experimental.categories.Category;
033
034@Category({ MetricsTests.class, SmallTests.class })
035public class TestMutableRangeHistogram {
036
037  @ClassRule
038  public static final HBaseClassTestRule CLASS_RULE =
039    HBaseClassTestRule.forClass(TestMutableRangeHistogram.class);
040
041  private static final String RECORD_NAME = "test";
042  private static final String SIZE_HISTOGRAM_NAME = "TestSize";
043
044  /**
045   * calculate the distribution for last bucket, see HBASE-24615 for detail.
046   */
047  @Test
048  public void testLastBucketWithSizeHistogram() {
049    // create and init histogram minValue and maxValue
050    MetricsCollectorImpl collector = new MetricsCollectorImpl();
051    MutableSizeHistogram histogram = new MutableSizeHistogram(SIZE_HISTOGRAM_NAME, "");
052    long[] ranges = histogram.getRanges();
053    int len = ranges.length;
054    histogram.add(0L);
055    histogram.add(ranges[len - 1]);
056    histogram.snapshot(collector.addRecord(RECORD_NAME), true);
057    collector.clear();
058
059    // fill up values and snapshot
060    histogram.add(ranges[len - 2] * 2);
061    histogram.add(ranges[len - 1] * 2);
062    histogram.snapshot(collector.addRecord(RECORD_NAME), true);
063    List<? extends MetricsRecord> records = collector.getRecords();
064    assertEquals(1, records.size());
065    MetricsRecord record = records.iterator().next();
066    assertEquals(RECORD_NAME, record.name());
067
068    // get size range metrics
069    String histogramMetricPrefix = SIZE_HISTOGRAM_NAME + "_" + histogram.getRangeType();
070    List<AbstractMetric> metrics = new ArrayList<>();
071    for (AbstractMetric metric : record.metrics()) {
072      if (metric.name().startsWith(histogramMetricPrefix)) {
073        metrics.add(metric);
074      }
075    }
076    assertEquals(2, metrics.size());
077
078    // check range [10000000,100000000]
079    String metricName = histogramMetricPrefix + "_" + ranges[len - 2] + "-" + ranges[len - 1];
080    assertEquals(metricName, metrics.get(0).name());
081    assertEquals(1, metrics.get(0).value().longValue());
082
083    // check range [100000000, inf]
084    metricName = histogramMetricPrefix + "_" + ranges[len - 1] + "-inf";
085    assertEquals(metricName, metrics.get(1).name(), metricName);
086    assertEquals(1, metrics.get(1).value().longValue());
087  }
088}