hbase-server/src/test/java/org/apache/hadoop/hbase/client/TestMasterRegistry.java - hbase - Git at Google

 /*
  * Licensed to the Apache Software Foundation (ASF) under one
  * or more contributor license agreements.  See the NOTICE file
  * distributed with this work for additional information
  * regarding copyright ownership.  The ASF licenses this file
  * to you under the Apache License, Version 2.0 (the
  * "License"); you may not use this file except in compliance
  * with the License.  You may obtain a copy of the License at
  *
  *     http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
 package org.apache.hadoop.hbase.client;

 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertFalse;
 import static org.junit.Assert.assertTrue;

 import java.io.IOException;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Collections;
 import java.util.Comparator;
 import java.util.List;
 import java.util.Set;
 import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.hbase.HBaseClassTestRule;
 import org.apache.hadoop.hbase.HBaseTestingUtility;
 import org.apache.hadoop.hbase.HConstants;
 import org.apache.hadoop.hbase.HRegionLocation;
 import org.apache.hadoop.hbase.ServerName;
 import org.apache.hadoop.hbase.StartMiniClusterOption;
 import org.apache.hadoop.hbase.TableName;
 import org.apache.hadoop.hbase.Waiter;
 import org.apache.hadoop.hbase.master.HMaster;
 import org.apache.hadoop.hbase.testclassification.ClientTests;
 import org.apache.hadoop.hbase.testclassification.MediumTests;
 import org.junit.AfterClass;
 import org.junit.BeforeClass;
 import org.junit.ClassRule;
 import org.junit.Test;
 import org.junit.experimental.categories.Category;

 import org.apache.hbase.thirdparty.com.google.common.base.Preconditions;

 @Category({ MediumTests.class, ClientTests.class })
 public class TestMasterRegistry {

   @ClassRule
   public static final HBaseClassTestRule CLASS_RULE =
       HBaseClassTestRule.forClass(TestMasterRegistry.class);
   private static final HBaseTestingUtility TEST_UTIL = new HBaseTestingUtility();

   @BeforeClass
   public static void setUp() throws Exception {
     StartMiniClusterOption.Builder builder = StartMiniClusterOption.builder();
     builder.numMasters(3).numRegionServers(3);
     TEST_UTIL.startMiniCluster(builder.build());
     HBaseTestingUtility.setReplicas(TEST_UTIL.getAdmin(), TableName.META_TABLE_NAME, 3);
   }

   @AfterClass
   public static void tearDown() throws Exception {
     TEST_UTIL.shutdownMiniCluster();
   }

   /**
    * Generates a string of dummy master addresses in host:port format. Every other hostname won't
    * have a port number.
    */
   private static String generateDummyMastersList(int size) {
     List<String> masters = new ArrayList<>();
     for (int i = 0; i < size; i++) {
       masters.add(" localhost" + (i % 2 == 0 ? ":" + (1000 + i) : ""));
     }
     return String.join(",", masters);
   }

   /**
    * Makes sure the master registry parses the master end points in the configuration correctly.
    */
   @Test
   public void testMasterAddressParsing() throws IOException {
     Configuration conf = new Configuration(TEST_UTIL.getConfiguration());
     int numMasters = 10;
     conf.set(HConstants.MASTER_ADDRS_KEY, generateDummyMastersList(numMasters));
     try (MasterRegistry registry = new MasterRegistry(conf)) {
       List<ServerName> parsedMasters = new ArrayList<>(registry.getParsedMasterServers());
       // Half of them would be without a port, duplicates are removed.
       assertEquals(numMasters / 2 + 1, parsedMasters.size());
       // Sort in the increasing order of port numbers.
       Collections.sort(parsedMasters, Comparator.comparingInt(ServerName::getPort));
       for (int i = 0; i < parsedMasters.size(); i++) {
         ServerName sn = parsedMasters.get(i);
         assertEquals("localhost", sn.getHostname());
         if (i == parsedMasters.size() - 1) {
           // Last entry should be the one with default port.
           assertEquals(HConstants.DEFAULT_MASTER_PORT, sn.getPort());
         } else {
           assertEquals(1000 + (2 * i), sn.getPort());
         }
       }
     }
   }

   @Test
   public void testRegistryRPCs() throws Exception {
     Configuration conf = new Configuration(TEST_UTIL.getConfiguration());
     HMaster activeMaster = TEST_UTIL.getHBaseCluster().getMaster();
     final int size =
       activeMaster.getMetaRegionLocationCache().getMetaRegionLocations().get().size();
     for (int numHedgedReqs = 1; numHedgedReqs <= size; numHedgedReqs++) {
       conf.setInt(MasterRegistry.MASTER_REGISTRY_HEDGED_REQS_FANOUT_KEY, numHedgedReqs);
       try (MasterRegistry registry = new MasterRegistry(conf)) {
         // Add wait on all replicas being assigned before proceeding w/ test. Failed on occasion
         // because not all replicas had made it up before test started.
         RegionReplicaTestHelper.waitUntilAllMetaReplicasAreReady(TEST_UTIL, registry);
         assertEquals(registry.getClusterId().get(), activeMaster.getClusterId());
         assertEquals(registry.getActiveMaster().get(), activeMaster.getServerName());
         List<HRegionLocation> metaLocations =
           Arrays.asList(registry.getMetaRegionLocations().get().getRegionLocations());
         List<HRegionLocation> actualMetaLocations =
           activeMaster.getMetaRegionLocationCache().getMetaRegionLocations().get();
         Collections.sort(metaLocations);
         Collections.sort(actualMetaLocations);
         assertEquals(actualMetaLocations, metaLocations);
       }
     }
   }

   /**
    * Tests that the list of masters configured in the MasterRegistry is dynamically refreshed in the
    * event of errors.
    */
   @Test
   public void testDynamicMasterConfigurationRefresh() throws Exception {
     Configuration conf = new Configuration(TEST_UTIL.getConfiguration());
     String currentMasterAddrs = Preconditions.checkNotNull(conf.get(HConstants.MASTER_ADDRS_KEY));
     HMaster activeMaster = TEST_UTIL.getHBaseCluster().getMaster();
     String clusterId = activeMaster.getClusterId();
     // Add a non-working master
     ServerName badServer = ServerName.valueOf("localhost", 1234, -1);
     conf.set(HConstants.MASTER_ADDRS_KEY, badServer.toShortString() + "," + currentMasterAddrs);
     // Set the hedging fan out so that all masters are queried.
     conf.setInt(MasterRegistry.MASTER_REGISTRY_HEDGED_REQS_FANOUT_KEY, 4);
     // Do not limit the number of refreshes during the test run.
     conf.setLong(MasterAddressRefresher.MIN_SECS_BETWEEN_REFRESHES, 0);
     try (MasterRegistry registry = new MasterRegistry(conf)) {
       final Set<ServerName> masters = registry.getParsedMasterServers();
       assertTrue(masters.contains(badServer));
       // Make a registry RPC, this should trigger a refresh since one of the hedged RPC fails.
       assertEquals(registry.getClusterId().get(), clusterId);
       // Wait for new set of masters to be populated.
       TEST_UTIL.waitFor(5000,
           (Waiter.Predicate<Exception>) () -> !registry.getParsedMasterServers().equals(masters));
       // new set of masters should not include the bad server
       final Set<ServerName> newMasters = registry.getParsedMasterServers();
       // Bad one should be out.
       assertEquals(3, newMasters.size());
       assertFalse(newMasters.contains(badServer));
       // Kill the active master
       activeMaster.stopMaster();
       TEST_UTIL.waitFor(10000,
         () -> TEST_UTIL.getMiniHBaseCluster().getLiveMasterThreads().size() == 2);
       TEST_UTIL.getMiniHBaseCluster().waitForActiveAndReadyMaster(10000);
       // Wait until the killed master de-registered. This should also trigger another refresh.
       TEST_UTIL.waitFor(10000, () -> registry.getMasters().get().size() == 2);
       TEST_UTIL.waitFor(20000, () -> registry.getParsedMasterServers().size() == 2);
       final Set<ServerName> newMasters2 = registry.getParsedMasterServers();
       assertEquals(2, newMasters2.size());
       assertFalse(newMasters2.contains(activeMaster.getServerName()));
     } finally {
       // Reset the state, add a killed master.
       TEST_UTIL.getMiniHBaseCluster().startMaster();
     }
   }
 }
	/*
	* Licensed to the Apache Software Foundation (ASF) under one
	* or more contributor license agreements. See the NOTICE file
	* distributed with this work for additional information
	* regarding copyright ownership. The ASF licenses this file
	* to you under the Apache License, Version 2.0 (the
	* "License"); you may not use this file except in compliance
	* with the License. You may obtain a copy of the License at
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software
	* distributed under the License is distributed on an "AS IS" BASIS,
	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	* See the License for the specific language governing permissions and
	* limitations under the License.
	*/
	package org.apache.hadoop.hbase.client;

	import static org.junit.Assert.assertEquals;
	import static org.junit.Assert.assertFalse;
	import static org.junit.Assert.assertTrue;

	import java.io.IOException;
	import java.util.ArrayList;
	import java.util.Arrays;
	import java.util.Collections;
	import java.util.Comparator;
	import java.util.List;
	import java.util.Set;
	import org.apache.hadoop.conf.Configuration;
	import org.apache.hadoop.hbase.HBaseClassTestRule;
	import org.apache.hadoop.hbase.HBaseTestingUtility;
	import org.apache.hadoop.hbase.HConstants;
	import org.apache.hadoop.hbase.HRegionLocation;
	import org.apache.hadoop.hbase.ServerName;
	import org.apache.hadoop.hbase.StartMiniClusterOption;
	import org.apache.hadoop.hbase.TableName;
	import org.apache.hadoop.hbase.Waiter;
	import org.apache.hadoop.hbase.master.HMaster;
	import org.apache.hadoop.hbase.testclassification.ClientTests;
	import org.apache.hadoop.hbase.testclassification.MediumTests;
	import org.junit.AfterClass;
	import org.junit.BeforeClass;
	import org.junit.ClassRule;
	import org.junit.Test;
	import org.junit.experimental.categories.Category;

	import org.apache.hbase.thirdparty.com.google.common.base.Preconditions;

	@Category({ MediumTests.class, ClientTests.class })
	public class TestMasterRegistry {

	@ClassRule
	public static final HBaseClassTestRule CLASS_RULE =
	HBaseClassTestRule.forClass(TestMasterRegistry.class);
	private static final HBaseTestingUtility TEST_UTIL = new HBaseTestingUtility();

	@BeforeClass
	public static void setUp() throws Exception {
	StartMiniClusterOption.Builder builder = StartMiniClusterOption.builder();
	builder.numMasters(3).numRegionServers(3);
	TEST_UTIL.startMiniCluster(builder.build());
	HBaseTestingUtility.setReplicas(TEST_UTIL.getAdmin(), TableName.META_TABLE_NAME, 3);
	}

	@AfterClass
	public static void tearDown() throws Exception {
	TEST_UTIL.shutdownMiniCluster();
	}

	/**
	* Generates a string of dummy master addresses in host:port format. Every other hostname won't
	* have a port number.
	*/
	private static String generateDummyMastersList(int size) {
	List<String> masters = new ArrayList<>();
	for (int i = 0; i < size; i++) {
	masters.add(" localhost" + (i % 2 == 0 ? ":" + (1000 + i) : ""));
	}
	return String.join(",", masters);
	}

	/**
	* Makes sure the master registry parses the master end points in the configuration correctly.
	*/
	@Test
	public void testMasterAddressParsing() throws IOException {
	Configuration conf = new Configuration(TEST_UTIL.getConfiguration());
	int numMasters = 10;
	conf.set(HConstants.MASTER_ADDRS_KEY, generateDummyMastersList(numMasters));
	try (MasterRegistry registry = new MasterRegistry(conf)) {
	List<ServerName> parsedMasters = new ArrayList<>(registry.getParsedMasterServers());
	// Half of them would be without a port, duplicates are removed.
	assertEquals(numMasters / 2 + 1, parsedMasters.size());
	// Sort in the increasing order of port numbers.
	Collections.sort(parsedMasters, Comparator.comparingInt(ServerName::getPort));
	for (int i = 0; i < parsedMasters.size(); i++) {
	ServerName sn = parsedMasters.get(i);
	assertEquals("localhost", sn.getHostname());
	if (i == parsedMasters.size() - 1) {
	// Last entry should be the one with default port.
	assertEquals(HConstants.DEFAULT_MASTER_PORT, sn.getPort());
	} else {
	assertEquals(1000 + (2 * i), sn.getPort());
	}
	}
	}
	}

	@Test
	public void testRegistryRPCs() throws Exception {
	Configuration conf = new Configuration(TEST_UTIL.getConfiguration());
	HMaster activeMaster = TEST_UTIL.getHBaseCluster().getMaster();
	final int size =
	activeMaster.getMetaRegionLocationCache().getMetaRegionLocations().get().size();
	for (int numHedgedReqs = 1; numHedgedReqs <= size; numHedgedReqs++) {
	conf.setInt(MasterRegistry.MASTER_REGISTRY_HEDGED_REQS_FANOUT_KEY, numHedgedReqs);
	try (MasterRegistry registry = new MasterRegistry(conf)) {
	// Add wait on all replicas being assigned before proceeding w/ test. Failed on occasion
	// because not all replicas had made it up before test started.
	RegionReplicaTestHelper.waitUntilAllMetaReplicasAreReady(TEST_UTIL, registry);
	assertEquals(registry.getClusterId().get(), activeMaster.getClusterId());
	assertEquals(registry.getActiveMaster().get(), activeMaster.getServerName());
	List<HRegionLocation> metaLocations =
	Arrays.asList(registry.getMetaRegionLocations().get().getRegionLocations());
	List<HRegionLocation> actualMetaLocations =
	activeMaster.getMetaRegionLocationCache().getMetaRegionLocations().get();
	Collections.sort(metaLocations);
	Collections.sort(actualMetaLocations);
	assertEquals(actualMetaLocations, metaLocations);
	}
	}
	}

	/**
	* Tests that the list of masters configured in the MasterRegistry is dynamically refreshed in the
	* event of errors.
	*/
	@Test
	public void testDynamicMasterConfigurationRefresh() throws Exception {
	Configuration conf = new Configuration(TEST_UTIL.getConfiguration());
	String currentMasterAddrs = Preconditions.checkNotNull(conf.get(HConstants.MASTER_ADDRS_KEY));
	HMaster activeMaster = TEST_UTIL.getHBaseCluster().getMaster();
	String clusterId = activeMaster.getClusterId();
	// Add a non-working master
	ServerName badServer = ServerName.valueOf("localhost", 1234, -1);
	conf.set(HConstants.MASTER_ADDRS_KEY, badServer.toShortString() + "," + currentMasterAddrs);
	// Set the hedging fan out so that all masters are queried.
	conf.setInt(MasterRegistry.MASTER_REGISTRY_HEDGED_REQS_FANOUT_KEY, 4);
	// Do not limit the number of refreshes during the test run.
	conf.setLong(MasterAddressRefresher.MIN_SECS_BETWEEN_REFRESHES, 0);
	try (MasterRegistry registry = new MasterRegistry(conf)) {
	final Set<ServerName> masters = registry.getParsedMasterServers();
	assertTrue(masters.contains(badServer));
	// Make a registry RPC, this should trigger a refresh since one of the hedged RPC fails.
	assertEquals(registry.getClusterId().get(), clusterId);
	// Wait for new set of masters to be populated.
	TEST_UTIL.waitFor(5000,
	(Waiter.Predicate<Exception>) () -> !registry.getParsedMasterServers().equals(masters));
	// new set of masters should not include the bad server
	final Set<ServerName> newMasters = registry.getParsedMasterServers();
	// Bad one should be out.
	assertEquals(3, newMasters.size());
	assertFalse(newMasters.contains(badServer));
	// Kill the active master
	activeMaster.stopMaster();
	TEST_UTIL.waitFor(10000,
	() -> TEST_UTIL.getMiniHBaseCluster().getLiveMasterThreads().size() == 2);
	TEST_UTIL.getMiniHBaseCluster().waitForActiveAndReadyMaster(10000);
	// Wait until the killed master de-registered. This should also trigger another refresh.
	TEST_UTIL.waitFor(10000, () -> registry.getMasters().get().size() == 2);
	TEST_UTIL.waitFor(20000, () -> registry.getParsedMasterServers().size() == 2);
	final Set<ServerName> newMasters2 = registry.getParsedMasterServers();
	assertEquals(2, newMasters2.size());
	assertFalse(newMasters2.contains(activeMaster.getServerName()));
	} finally {
	// Reset the state, add a killed master.
	TEST_UTIL.getMiniHBaseCluster().startMaster();
	}
	}
	}