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.master.normalizer;
019
020import static org.junit.Assert.assertEquals;
021import static org.junit.Assert.assertFalse;
022import static org.junit.Assert.assertTrue;
023
024import java.util.regex.Matcher;
025import java.util.regex.Pattern;
026import org.apache.hadoop.conf.Configuration;
027import org.apache.hadoop.hbase.HBaseClassTestRule;
028import org.apache.hadoop.hbase.HBaseTestingUtil;
029import org.apache.hadoop.hbase.TableName;
030import org.apache.hadoop.hbase.conf.ConfigurationManager;
031import org.apache.hadoop.hbase.master.MasterServices;
032import org.apache.hadoop.hbase.testclassification.MasterTests;
033import org.apache.hadoop.hbase.testclassification.SmallTests;
034import org.junit.Before;
035import org.junit.ClassRule;
036import org.junit.Test;
037import org.junit.experimental.categories.Category;
038import org.mockito.Mock;
039import org.mockito.MockitoAnnotations;
040
041import org.apache.hbase.thirdparty.com.google.common.util.concurrent.RateLimiter;
042
043/**
044 * Test that configuration changes are propagated to all children.
045 */
046@Category({ MasterTests.class, SmallTests.class })
047public class TestRegionNormalizerManagerConfigurationObserver {
048
049  @ClassRule
050  public static final HBaseClassTestRule CLASS_RULE =
051    HBaseClassTestRule.forClass(TestRegionNormalizerManagerConfigurationObserver.class);
052
053  private static final HBaseTestingUtil testUtil = new HBaseTestingUtil();
054  private static final Pattern rateLimitPattern =
055    Pattern.compile("RateLimiter\\[stableRate=(?<rate>.+)qps]");
056
057  private Configuration conf;
058  private SimpleRegionNormalizer normalizer;
059  @Mock
060  private MasterServices masterServices;
061  @Mock
062  private RegionNormalizerStateStore stateStore;
063  @Mock
064  private RegionNormalizerChore chore;
065  @Mock
066  private RegionNormalizerWorkQueue<TableName> queue;
067  private RegionNormalizerWorker worker;
068  private ConfigurationManager configurationManager;
069
070  @Before
071  public void before() {
072    MockitoAnnotations.initMocks(this);
073    conf = testUtil.getConfiguration();
074    normalizer = new SimpleRegionNormalizer();
075    worker = new RegionNormalizerWorker(conf, masterServices, normalizer, queue);
076    final RegionNormalizerManager normalizerManager =
077      new RegionNormalizerManager(stateStore, chore, queue, worker);
078    configurationManager = new ConfigurationManager();
079    configurationManager.registerObserver(normalizerManager);
080  }
081
082  @Test
083  public void test() {
084    assertTrue(normalizer.isMergeEnabled());
085    assertEquals(3, normalizer.getMergeMinRegionCount());
086    assertEquals(1_000_000L, parseConfiguredRateLimit(worker.getRateLimiter()));
087
088    final Configuration newConf = new Configuration(conf);
089    // configs on SimpleRegionNormalizer
090    newConf.setBoolean("hbase.normalizer.merge.enabled", false);
091    newConf.setInt("hbase.normalizer.merge.min.region.count", 100);
092    // config on RegionNormalizerWorker
093    newConf.set("hbase.normalizer.throughput.max_bytes_per_sec", "12g");
094
095    configurationManager.notifyAllObservers(newConf);
096    assertFalse(normalizer.isMergeEnabled());
097    assertEquals(100, normalizer.getMergeMinRegionCount());
098    assertEquals(12_884L, parseConfiguredRateLimit(worker.getRateLimiter()));
099  }
100
101  /**
102   * The {@link RateLimiter} class does not publicly expose its currently configured rate. It does
103   * offer this information in the {@link RateLimiter#toString()} method. It's fragile, but parse
104   * this value. The alternative would be to track the value explicitly in the worker, and the
105   * associated coordination overhead paid at runtime. See the related note on
106   * {@link RegionNormalizerWorker#getRateLimiter()}.
107   */
108  private static long parseConfiguredRateLimit(final RateLimiter rateLimiter) {
109    final String val = rateLimiter.toString();
110    final Matcher matcher = rateLimitPattern.matcher(val);
111    assertTrue(matcher.matches());
112    final String parsedRate = matcher.group("rate");
113    return (long) Double.parseDouble(parsedRate);
114  }
115}