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.hbase.util;
019
020import static org.junit.jupiter.api.Assertions.assertEquals;
021import static org.junit.jupiter.api.Assertions.assertTrue;
022
023import org.apache.hadoop.conf.Configuration;
024import org.apache.hadoop.hbase.HBaseConfiguration;
025import org.apache.hadoop.hbase.testclassification.MiscTests;
026import org.apache.hadoop.hbase.testclassification.SmallTests;
027import org.junit.jupiter.api.Tag;
028import org.junit.jupiter.api.Test;
029
030@Tag(MiscTests.TAG)
031@Tag(SmallTests.TAG)
032public class TestLossyCounting {
033
034  private final Configuration conf = HBaseConfiguration.create();
035
036  @Test
037  public void testBucketSize() {
038    LossyCounting<?> lossyCounting = new LossyCounting<>("testBucketSize", 0.01);
039    assertEquals(100L, lossyCounting.getBucketSize());
040    LossyCounting<?> lossyCounting2 = new LossyCounting<>("testBucketSize2", conf);
041    assertEquals(50L, lossyCounting2.getBucketSize());
042  }
043
044  @Test
045  public void testAddByOne() {
046    LossyCounting<String> lossyCounting = new LossyCounting<>("testAddByOne", 0.01);
047    for (int i = 0; i < 100; i++) {
048      String key = "" + i;
049      lossyCounting.add(key);
050    }
051    assertEquals(100L, lossyCounting.getDataSize());
052    for (int i = 0; i < 100; i++) {
053      String key = "" + i;
054      assertTrue(lossyCounting.contains(key));
055    }
056  }
057
058  @Test
059  public void testSweep1() throws Exception {
060    LossyCounting<String> lossyCounting = new LossyCounting<>("testSweep1", 0.01);
061    for (int i = 0; i < 400; i++) {
062      String key = "" + i;
063      lossyCounting.add(key);
064    }
065    assertEquals(4L, lossyCounting.getCurrentTerm());
066    waitForSweep(lossyCounting);
067
068    // Do last one sweep as some sweep will be skipped when first one was running
069    lossyCounting.sweep();
070    assertEquals(lossyCounting.getBucketSize() - 1, lossyCounting.getDataSize());
071  }
072
073  private void waitForSweep(LossyCounting<?> lossyCounting) throws InterruptedException {
074    // wait for sweep thread to complete
075    int retry = 0;
076    while (!lossyCounting.getSweepFuture().isDone() && retry < 10) {
077      Thread.sleep(100);
078      retry++;
079    }
080  }
081
082  @Test
083  public void testSweep2() throws Exception {
084    LossyCounting<String> lossyCounting = new LossyCounting<>("testSweep2", 0.1);
085    for (int i = 0; i < 10; i++) {
086      String key = "" + i;
087      lossyCounting.add(key);
088    }
089    waitForSweep(lossyCounting);
090    assertEquals(10L, lossyCounting.getDataSize());
091    for (int i = 0; i < 10; i++) {
092      String key = "1";
093      lossyCounting.add(key);
094    }
095    waitForSweep(lossyCounting);
096    assertEquals(1L, lossyCounting.getDataSize());
097  }
098}