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