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.balancer;
019
020import static org.junit.Assert.assertEquals;
021
022import java.util.Random;
023import java.util.concurrent.ThreadLocalRandom;
024import org.apache.hadoop.conf.Configuration;
025import org.apache.hadoop.hbase.HBaseClassTestRule;
026import org.apache.hadoop.hbase.HBaseTestingUtility;
027import org.apache.hadoop.hbase.MiniHBaseCluster;
028import org.apache.hadoop.hbase.master.HMaster;
029import org.apache.hadoop.hbase.testclassification.MediumTests;
030import org.apache.hadoop.metrics2.MetricsSource;
031import org.apache.hadoop.metrics2.MetricsTag;
032import org.apache.hadoop.metrics2.lib.DefaultMetricsSystem;
033import org.junit.AfterClass;
034import org.junit.BeforeClass;
035import org.junit.ClassRule;
036import org.junit.Test;
037import org.junit.experimental.categories.Category;
038import org.slf4j.Logger;
039import org.slf4j.LoggerFactory;
040
041@Category({ MediumTests.class })
042public class TestBalancerStatusTagInJMXMetrics extends BalancerTestBase {
043
044  @ClassRule
045  public static final HBaseClassTestRule CLASS_RULE =
046    HBaseClassTestRule.forClass(TestBalancerStatusTagInJMXMetrics.class);
047
048  private static final Logger LOG =
049    LoggerFactory.getLogger(TestBalancerStatusTagInJMXMetrics.class);
050  private static HBaseTestingUtility UTIL = new HBaseTestingUtility();
051  private static int connectorPort = 61120;
052  private static HMaster master;
053  private static MiniHBaseCluster cluster;
054  private static Configuration conf = null;
055
056  /**
057   * Setup the environment for the test.
058   */
059  @BeforeClass
060  public static void setupBeforeClass() throws Exception {
061    conf = UTIL.getConfiguration();
062    Random rand = ThreadLocalRandom.current();
063    for (int i = 0; i < 10; i++) {
064      do {
065        int sign = i % 2 == 0 ? 1 : -1;
066        connectorPort += sign * rand.nextInt(100);
067      } while (!HBaseTestingUtility.available(connectorPort));
068      try {
069        conf.setInt("regionserver.rmi.registry.port", connectorPort);
070        cluster = UTIL.startMiniCluster();
071        LOG.info("Waiting for active/ready master");
072        cluster.waitForActiveAndReadyMaster();
073        master = cluster.getMaster();
074        break;
075      } catch (Exception e) {
076        LOG.debug("Encountered exception when starting mini cluster. Trying port " + connectorPort,
077          e);
078        try {
079          // this is to avoid "IllegalStateException: A mini-cluster is already running"
080          UTIL.shutdownMiniCluster();
081        } catch (Exception ex) {
082          LOG.debug("Encountered exception shutting down cluster", ex);
083        }
084      }
085    }
086  }
087
088  @AfterClass
089  public static void tearDownAfterClass() throws Exception {
090    UTIL.shutdownMiniCluster();
091  }
092
093  /**
094   * Tests the status change using the Default Metrics System
095   */
096  @Test
097  public void testJmxMetrics() throws Exception {
098
099    assertEquals(getStatus(), "true");
100    master.getLoadBalancer().updateBalancerStatus(false);
101    assertEquals(getStatus(), "false");
102
103  }
104
105  /**
106   * Gets the balancer status tag from the Metrics registry
107   */
108  public String getStatus() throws Exception {
109    MetricsSource source =
110      DefaultMetricsSystem.instance().getSource(MetricsBalancerSource.METRICS_JMX_CONTEXT);
111    if (source instanceof MetricsBalancerSourceImpl) {
112      MetricsTag status = ((MetricsBalancerSourceImpl) source).getMetricsRegistry()
113        .getTag(MetricsBalancerSource.BALANCER_STATUS);
114      return status.value();
115    } else {
116      LOG.warn("Balancer JMX Metrics not registered");
117      throw new Exception("MetricsBalancer JMX Context not found");
118    }
119  }
120
121}