@Test
  public void testLocalMapInPeerTypePdxRegistry() throws CacheException {

    final Host host = Host.getHost(0);
    final VM vm0 = host.getVM(0);
    final VM vm1 = host.getVM(1);
    final VM vm2 = host.getVM(2);
    final VM vm3 = host.getVM(3);
    final int numberOfEntries = 10;
    final String name = SEPARATOR + regionName;
    final String[] qs = {"select * from " + name + " where pdxStatus = 'active'",
        "select pdxStatus from " + name + " where id > 4"};

    // Start server1
    final int port1 = (Integer) vm0.invoke(new SerializableCallable("Create Server1") {
      @Override
      public Object call() throws Exception {
        getCache().createRegionFactory(RegionShortcut.REPLICATE).create(regionName);

        CacheServer server = getCache().addCacheServer();
        int port = AvailablePortHelper.getRandomAvailableTCPPort();
        server.setPort(port);
        server.start();
        return port;
      }
    });

    // Start server2
    final int port2 = (Integer) vm1.invoke(new SerializableCallable("Create Server2") {
      @Override
      public Object call() throws Exception {
        Region r1 = getCache().createRegionFactory(RegionShortcut.REPLICATE).create(regionName);

        CacheServer server = getCache().addCacheServer();
        int port = AvailablePortHelper.getRandomAvailableTCPPort();
        server.setPort(port);
        server.start();
        return port;
      }
    });

    // client1 loads version 1 objects on server1
    vm2.invoke(new SerializableCallable("Create client") {
      @Override
      public Object call() throws Exception {
        ClientCacheFactory cf = new ClientCacheFactory();
        cf.addPoolServer(NetworkUtils.getServerHostName(vm0.getHost()), port1);
        ClientCache cache = getClientCache(cf);
        Region region =
            cache.createClientRegionFactory(ClientRegionShortcut.PROXY).create(regionName);

        // Load version 1 objects
        for (int i = 0; i < numberOfEntries; i++) {
          PdxInstanceFactory pdxInstanceFactory =
              PdxInstanceFactoryImpl.newCreator("PdxVersionedNewPortfolio", false, getCache());
          pdxInstanceFactory.writeInt("id", i);
          pdxInstanceFactory.writeString("pdxStatus", (i % 2 == 0 ? "active" : "inactive"));
          PdxInstance pdxInstance = pdxInstanceFactory.create();
          region.put("key-" + i, pdxInstance);
        }

        return null;
      }
    });

    // client 2 loads version 2 objects on server2
    vm3.invoke(new SerializableCallable("Create client") {
      @Override
      public Object call() throws Exception {
        ClientCacheFactory cf = new ClientCacheFactory();
        cf.addPoolServer(NetworkUtils.getServerHostName(vm1.getHost()), port2);
        ClientCache cache = getClientCache(cf);
        Region region =
            cache.createClientRegionFactory(ClientRegionShortcut.PROXY).create(regionName);
        // Load version 2 objects
        for (int i = numberOfEntries; i < numberOfEntries * 2; i++) {
          PdxInstanceFactory pdxInstanceFactory =
              PdxInstanceFactoryImpl.newCreator("PdxVersionedNewPortfolio", false, getCache());
          pdxInstanceFactory.writeInt("id", i);
          pdxInstanceFactory.writeString("status", (i % 2 == 0 ? "active" : "inactive"));
          PdxInstance pdxInstance = pdxInstanceFactory.create();
          region.put("key-" + i, pdxInstance);
        }
        return null;
      }
    });

    final SerializableRunnableIF verifyTwoPdxTypesArePresent = () -> {
      TypeRegistration registration = getCache().getPdxRegistry().getTypeRegistration();
      assertTrue(registration instanceof PeerTypeRegistration);

      final Map<Integer, PdxType> types = registration.types();
      assertEquals(2, types.size());
      for (PdxType type : types.values()) {
        assertEquals("PdxVersionedNewPortfolio", type.getClassName());
      }
    };

    vm0.invoke(verifyTwoPdxTypesArePresent);
    vm1.invoke(verifyTwoPdxTypesArePresent);
  }
In PeerTypeRegistration when a PdxType is updated, a local map of class => PdxTypes is
populated. This map is used to search a field for a class in different versions (PdxTypes) This
test verifies that the map is being updated by the cacheListener
geode-core/src/distributedTest/java/org/apache/geode/cache/query/dunit/PdxQueryDUnitTest.java