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