001/*
002 *
003 * Licensed to the Apache Software Foundation (ASF) under one
004 * or more contributor license agreements.  See the NOTICE file
005 * distributed with this work for additional information
006 * regarding copyright ownership.  The ASF licenses this file
007 * to you under the Apache License, Version 2.0 (the
008 * "License"); you may not use this file except in compliance
009 * with the License.  You may obtain a copy of the License at
010 *
011 *     http://www.apache.org/licenses/LICENSE-2.0
012 *
013 * Unless required by applicable law or agreed to in writing, software
014 * distributed under the License is distributed on an "AS IS" BASIS,
015 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
016 * See the License for the specific language governing permissions and
017 * limitations under the License.
018 */
019
020package org.apache.hadoop.hbase.util;
021
022import static org.junit.Assert.assertEquals;
023import static org.junit.Assert.assertTrue;
024import org.apache.hadoop.conf.Configuration;
025import org.apache.hadoop.hbase.HBaseClassTestRule;
026import org.apache.hadoop.hbase.HBaseConfiguration;
027import org.apache.hadoop.hbase.testclassification.MiscTests;
028import org.apache.hadoop.hbase.testclassification.SmallTests;
029import org.junit.ClassRule;
030import org.junit.Test;
031import org.junit.experimental.categories.Category;
032
033@Category({MiscTests.class, SmallTests.class})
034public class TestLossyCounting {
035
036  @ClassRule
037  public static final HBaseClassTestRule CLASS_RULE =
038      HBaseClassTestRule.forClass(TestLossyCounting.class);
039
040  private final Configuration conf = HBaseConfiguration.create();
041
042  @Test
043  public void testBucketSize() {
044    LossyCounting<?> lossyCounting = new LossyCounting<>("testBucketSize", 0.01);
045    assertEquals(100L, lossyCounting.getBucketSize());
046    LossyCounting<?> lossyCounting2 = new LossyCounting<>("testBucketSize2", conf);
047    assertEquals(50L, lossyCounting2.getBucketSize());
048  }
049
050  @Test
051  public void testAddByOne() {
052    LossyCounting<String> lossyCounting = new LossyCounting<>("testAddByOne", 0.01);
053    for (int i = 0; i < 100; i++) {
054      String key = "" + i;
055      lossyCounting.add(key);
056    }
057    assertEquals(100L, lossyCounting.getDataSize());
058    for (int i = 0; i < 100; i++) {
059      String key = "" + i;
060      assertTrue(lossyCounting.contains(key));
061    }
062  }
063
064  @Test
065  public void testSweep1() throws Exception {
066    LossyCounting<String> lossyCounting = new LossyCounting<>("testSweep1", 0.01);
067    for(int i = 0; i < 400; i++){
068      String key = "" + i;
069      lossyCounting.add(key);
070    }
071    assertEquals(4L, lossyCounting.getCurrentTerm());
072    waitForSweep(lossyCounting);
073
074    //Do last one sweep as some sweep will be skipped when first one was running
075    lossyCounting.sweep();
076    assertEquals(lossyCounting.getBucketSize() - 1, lossyCounting.getDataSize());
077  }
078
079  private void waitForSweep(LossyCounting<?> lossyCounting) throws InterruptedException {
080    //wait for sweep thread to complete
081    int retry = 0;
082    while (!lossyCounting.getSweepFuture().isDone() && retry < 10) {
083      Thread.sleep(100);
084      retry++;
085    }
086  }
087
088  @Test
089  public void testSweep2() throws Exception {
090    LossyCounting<String> lossyCounting = new LossyCounting<>("testSweep2", 0.1);
091    for (int i = 0; i < 10; i++) {
092      String key = "" + i;
093      lossyCounting.add(key);
094    }
095    waitForSweep(lossyCounting);
096    assertEquals(10L, lossyCounting.getDataSize());
097    for(int i = 0; i < 10; i++){
098      String key = "1";
099      lossyCounting.add(key);
100    }
101    waitForSweep(lossyCounting);
102    assertEquals(1L, lossyCounting.getDataSize());
103  }
104}