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.client;
019
020import static org.junit.Assert.assertTrue;
021
022import java.util.Set;
023import java.util.TreeSet;
024import org.apache.hadoop.hbase.HBaseClassTestRule;
025import org.apache.hadoop.hbase.HConstants;
026import org.apache.hadoop.hbase.testclassification.ClientTests;
027import org.apache.hadoop.hbase.testclassification.SmallTests;
028import org.junit.ClassRule;
029import org.junit.Test;
030import org.junit.experimental.categories.Category;
031
032@Category({ SmallTests.class, ClientTests.class })
033public class TestConnectionUtils {
034
035  @ClassRule
036  public static final HBaseClassTestRule CLASS_RULE =
037    HBaseClassTestRule.forClass(TestConnectionUtils.class);
038
039  @Test
040  public void testRetryTimeJitter() {
041    long[] retries = new long[200];
042    long baseTime = 1000000; // Larger number than reality to help test randomness.
043    long maxTimeExpected = (long) (baseTime * 1.01f);
044    for (int i = 0; i < retries.length; i++) {
045      retries[i] = ConnectionUtils.getPauseTime(baseTime, 0);
046    }
047
048    Set<Long> retyTimeSet = new TreeSet<>();
049    for (long l : retries) {
050      /* make sure that there is some jitter but only 1% */
051      assertTrue(l >= baseTime);
052      assertTrue(l <= maxTimeExpected);
053      // Add the long to the set
054      retyTimeSet.add(l);
055    }
056
057    // Make sure that most are unique. some overlap will happen
058    assertTrue(retyTimeSet.size() > (retries.length * 0.80));
059  }
060
061  @Test
062  public void testGetPauseTime() {
063    long pauseTime;
064    long baseTime = 100;
065    pauseTime = ConnectionUtils.getPauseTime(baseTime, -1);
066    assertTrue(pauseTime >= (baseTime * HConstants.RETRY_BACKOFF[0]));
067    assertTrue(pauseTime <= (baseTime * HConstants.RETRY_BACKOFF[0] * 1.01f));
068
069    for (int i = 0; i < HConstants.RETRY_BACKOFF.length; i++) {
070      pauseTime = ConnectionUtils.getPauseTime(baseTime, i);
071      assertTrue(pauseTime >= (baseTime * HConstants.RETRY_BACKOFF[i]));
072      assertTrue(pauseTime <= (baseTime * HConstants.RETRY_BACKOFF[i] * 1.01f));
073    }
074
075    int length = HConstants.RETRY_BACKOFF.length;
076    pauseTime = ConnectionUtils.getPauseTime(baseTime, length);
077    assertTrue(pauseTime >= (baseTime * HConstants.RETRY_BACKOFF[length - 1]));
078    assertTrue(pauseTime <= (baseTime * HConstants.RETRY_BACKOFF[length - 1] * 1.01f));
079  }
080}