Examples with TransportClientFactory com.linkedin.r2.transport.common.TransportClientFactory used on opensource projects

Example 31 with TransportClientFactory

use of com.linkedin.r2.transport.common.TransportClientFactory in project rest.li by linkedin.

the class SimpleLoadBalancerTest method testGetClientWithBannedURI.

@Test
public void testGetClientWithBannedURI() throws Exception {
    Map<String, LoadBalancerStrategyFactory<? extends LoadBalancerStrategy>> loadBalancerStrategyFactories = new HashMap<>();
    Map<String, TransportClientFactory> clientFactories = new HashMap<>();
    List<String> prioritizedSchemes = new ArrayList<>();
    MockStore<ServiceProperties> serviceRegistry = new MockStore<>();
    MockStore<ClusterProperties> clusterRegistry = new MockStore<>();
    MockStore<UriProperties> uriRegistry = new MockStore<>();
    ScheduledExecutorService executorService = new SynchronousExecutorService();
    loadBalancerStrategyFactories.put("degrader", new DegraderLoadBalancerStrategyFactoryV3());
    clientFactories.put(PropertyKeys.HTTP_SCHEME, new DoNothingClientFactory());
    SimpleLoadBalancerState state = new SimpleLoadBalancerState(executorService, uriRegistry, clusterRegistry, serviceRegistry, clientFactories, loadBalancerStrategyFactories);
    SimpleLoadBalancer loadBalancer = new SimpleLoadBalancer(state, 5, TimeUnit.SECONDS, _d2Executor);
    FutureCallback<None> balancerCallback = new FutureCallback<>();
    loadBalancer.start(balancerCallback);
    balancerCallback.get();
    URI uri1Banned = URI.create("http://test.qd.com:1234");
    URI uri2Usable = URI.create("http://test.qd.com:5678");
    Map<Integer, PartitionData> partitionData = new HashMap<>(1);
    partitionData.put(DEFAULT_PARTITION_ID, new PartitionData(1d));
    Map<URI, Map<Integer, PartitionData>> uriData = new HashMap<>(2);
    uriData.put(uri1Banned, partitionData);
    uriData.put(uri2Usable, partitionData);
    prioritizedSchemes.add(PropertyKeys.HTTP_SCHEME);
    Set<URI> bannedSet = new HashSet<>();
    bannedSet.add(uri1Banned);
    clusterRegistry.put("cluster-1", new ClusterProperties("cluster-1", Collections.emptyList(), Collections.emptyMap(), bannedSet, NullPartitionProperties.getInstance()));
    serviceRegistry.put("foo", new ServiceProperties("foo", "cluster-1", "/foo", Arrays.asList("degrader"), Collections.<String, Object>emptyMap(), null, null, prioritizedSchemes, null));
    uriRegistry.put("cluster-1", new UriProperties("cluster-1", uriData));
    URI expectedUri = URI.create("http://test.qd.com:5678/foo");
    URIRequest uriRequest = new URIRequest("d2://foo/52");
    for (int i = 0; i < 10; ++i) {
        RewriteLoadBalancerClient client = (RewriteLoadBalancerClient) loadBalancer.getClient(uriRequest, new RequestContext());
        Assert.assertEquals(client.getUri(), expectedUri);
    }
}

Example 32 with TransportClientFactory

use of com.linkedin.r2.transport.common.TransportClientFactory in project rest.li by linkedin.

the class SimpleLoadBalancerTest method testLoadBalancerWithPartitionsSmoke.

// load balancer working with partitioned cluster
@Test(groups = { "small", "back-end" })
public void testLoadBalancerWithPartitionsSmoke() throws URISyntaxException, ServiceUnavailableException, InterruptedException, ExecutionException {
    for (int tryAgain = 0; tryAgain < 12; ++tryAgain) {
        Map<String, LoadBalancerStrategyFactory<? extends LoadBalancerStrategy>> loadBalancerStrategyFactories = new HashMap<>();
        Map<String, TransportClientFactory> clientFactories = new HashMap<>();
        List<String> prioritizedSchemes = new ArrayList<>();
        MockStore<ServiceProperties> serviceRegistry = new MockStore<>();
        MockStore<ClusterProperties> clusterRegistry = new MockStore<>();
        MockStore<UriProperties> uriRegistry = new MockStore<>();
        ScheduledExecutorService executorService = Executors.newSingleThreadScheduledExecutor();
        loadBalancerStrategyFactories.put("degrader", new DegraderLoadBalancerStrategyFactoryV3());
        clientFactories.put(PropertyKeys.HTTP_SCHEME, new DoNothingClientFactory());
        SimpleLoadBalancerState state = new SimpleLoadBalancerState(executorService, uriRegistry, clusterRegistry, serviceRegistry, clientFactories, loadBalancerStrategyFactories);
        SimpleLoadBalancer loadBalancer = new SimpleLoadBalancer(state, 5, TimeUnit.SECONDS, executorService);
        FutureCallback<None> balancerCallback = new FutureCallback<>();
        loadBalancer.start(balancerCallback);
        balancerCallback.get();
        URI uri1 = URI.create("http://test.qa1.com:1234");
        URI uri2 = URI.create("http://test.qa2.com:2345");
        URI uri3 = URI.create("http://test.qa3.com:6789");
        Map<URI, Double> uris = new HashMap<>();
        uris.put(uri1, 1d);
        uris.put(uri2, 1d);
        uris.put(uri3, 1d);
        Map<URI, Map<Integer, PartitionData>> partitionDesc = new HashMap<>();
        Map<Integer, PartitionData> server1 = new HashMap<>();
        server1.put(0, new PartitionData(1d));
        server1.put(1, new PartitionData(1d));
        Map<Integer, PartitionData> server2 = new HashMap<>();
        server2.put(0, new PartitionData(1d));
        Map<Integer, PartitionData> server3 = new HashMap<>();
        server3.put(1, new PartitionData(1d));
        partitionDesc.put(uri1, server1);
        partitionDesc.put(uri2, server2);
        partitionDesc.put(uri3, server3);
        prioritizedSchemes.add(PropertyKeys.HTTP_SCHEME);
        int partitionMethod = tryAgain % 4;
        switch(partitionMethod) {
            case 0:
                clusterRegistry.put("cluster-1", new ClusterProperties("cluster-1", null, new HashMap<>(), new HashSet<>(), new RangeBasedPartitionProperties("id=(\\d+)", 0, 50, 2)));
                break;
            case 1:
                clusterRegistry.put("cluster-1", new ClusterProperties("cluster-1", null, new HashMap<>(), new HashSet<>(), new HashBasedPartitionProperties("id=(\\d+)", 2, HashBasedPartitionProperties.HashAlgorithm.valueOf("MODULO"))));
                break;
            case 2:
                clusterRegistry.put("cluster-1", new ClusterProperties("cluster-1", null, new HashMap<>(), new HashSet<>(), new HashBasedPartitionProperties("id=(\\d+)", 2, HashBasedPartitionProperties.HashAlgorithm.valueOf("MD5"))));
                break;
            case 3:
                // test getRings with gap. here, no server serves partition 2
                clusterRegistry.put("cluster-1", new ClusterProperties("cluster-1", null, new HashMap<>(), new HashSet<>(), new RangeBasedPartitionProperties("id=(\\d+)", 0, 50, 4)));
                server3.put(3, new PartitionData(1d));
                partitionDesc.put(uri3, server3);
                break;
            default:
                break;
        }
        serviceRegistry.put("foo", new ServiceProperties("foo", "cluster-1", "/foo", Arrays.asList("degrader"), Collections.singletonMap(PropertyKeys.HTTP_LB_CONSISTENT_HASH_ALGORITHM, "pointBased"), null, null, prioritizedSchemes, null));
        uriRegistry.put("cluster-1", new UriProperties("cluster-1", partitionDesc));
        if (partitionMethod == 3) {
            Map<Integer, Ring<URI>> ringMap = loadBalancer.getRings(URI.create("d2://foo"));
            assertEquals(ringMap.size(), 4);
            // the ring for partition 2 should be empty
            assertEquals(ringMap.get(2).toString(), new ConsistentHashRing<>(Collections.emptyList()).toString());
            continue;
        }
        URI expectedUri1 = URI.create("http://test.qa1.com:1234/foo");
        URI expectedUri2 = URI.create("http://test.qa2.com:2345/foo");
        URI expectedUri3 = URI.create("http://test.qa3.com:6789/foo");
        Set<URI> expectedUris = new HashSet<>();
        expectedUris.add(expectedUri1);
        expectedUris.add(expectedUri2);
        expectedUris.add(expectedUri3);
        for (int i = 0; i < 1000; ++i) {
            int ii = i % 100;
            RewriteLoadBalancerClient client = (RewriteLoadBalancerClient) loadBalancer.getClient(new URIRequest("d2://foo/id=" + ii), new RequestContext());
            String clientUri = client.getUri().toString();
            HashFunction<String[]> hashFunction = null;
            String[] str = new String[1];
            // test KeyMapper target host hint: request is always to target host regardless of what's in d2 URI and whether it's hash-based or range-based partitions
            RequestContext requestContextWithHint = new RequestContext();
            KeyMapper.TargetHostHints.setRequestContextTargetHost(requestContextWithHint, uri1);
            RewriteLoadBalancerClient hintedClient1 = (RewriteLoadBalancerClient) loadBalancer.getClient(new URIRequest("d2://foo/id=" + ii), requestContextWithHint);
            String hintedUri1 = hintedClient1.getUri().toString();
            Assert.assertEquals(hintedUri1, uri1.toString() + "/foo");
            RewriteLoadBalancerClient hintedClient2 = (RewriteLoadBalancerClient) loadBalancer.getClient(new URIRequest("d2://foo/action=purge-all"), requestContextWithHint);
            String hintedUri2 = hintedClient2.getUri().toString();
            Assert.assertEquals(hintedUri2, uri1.toString() + "/foo");
            if (partitionMethod == 2) {
                hashFunction = new MD5Hash();
            }
            for (URI uri : expectedUris) {
                if (clientUri.contains(uri.toString())) {
                    // check if only key belonging to partition 0 gets uri2
                    if (uri.equals(uri2)) {
                        if (partitionMethod == 0) {
                            assertTrue(ii < 50);
                        } else if (partitionMethod == 1) {
                            assertTrue(ii % 2 == 0);
                        } else {
                            str[0] = ii + "";
                            assertTrue(hashFunction.hash(str) % 2 == 0);
                        }
                    }
                    // check if only key belonging to partition 1 gets uri3
                    if (uri.equals(uri3)) {
                        if (partitionMethod == 0) {
                            assertTrue(ii >= 50);
                        } else if (partitionMethod == 1) {
                            assertTrue(ii % 2 == 1);
                        } else {
                            str[0] = ii + "";
                            assertTrue(hashFunction.hash(str) % 2 == 1);
                        }
                    }
                }
            }
        }
        // two rings for two partitions
        Map<Integer, Ring<URI>> ringMap = loadBalancer.getRings(URI.create("d2://foo"));
        assertEquals(ringMap.size(), 2);
        if (partitionMethod != 2) {
            Set<String> keys = new HashSet<>();
            for (int j = 0; j < 50; j++) {
                if (partitionMethod == 0) {
                    keys.add(j + "");
                } else {
                    keys.add(j * 2 + "");
                }
            }
            // if it is range based partition, all keys from 0 ~ 49 belong to partition 0 according to the range definition
            // if it is modulo based partition, all even keys belong to partition 0 because the partition count is 2
            // only from partition 0
            MapKeyResult<Ring<URI>, String> mapKeyResult = loadBalancer.getRings(URI.create("d2://foo"), keys);
            Map<Ring<URI>, Collection<String>> keyToPartition = mapKeyResult.getMapResult();
            assertEquals(keyToPartition.size(), 1);
            for (Ring<URI> ring : keyToPartition.keySet()) {
                assertEquals(ring, ringMap.get(0));
            }
            // now also from partition 1
            keys.add("51");
            mapKeyResult = loadBalancer.getRings(URI.create("d2://foo"), keys);
            assertEquals(mapKeyResult.getMapResult().size(), 2);
            assertEquals(mapKeyResult.getUnmappedKeys().size(), 0);
            // now only from partition 1
            keys.clear();
            keys.add("99");
            mapKeyResult = loadBalancer.getRings(URI.create("d2://foo"), keys);
            keyToPartition = mapKeyResult.getMapResult();
            assertEquals(keyToPartition.size(), 1);
            assertEquals(mapKeyResult.getUnmappedKeys().size(), 0);
            for (Ring<URI> ring : keyToPartition.keySet()) {
                assertEquals(ring, ringMap.get(1));
            }
            keys.add("100");
            mapKeyResult = loadBalancer.getRings(URI.create("d2://foo"), keys);
            if (partitionMethod == 0) {
                // key out of range
                Collection<MapKeyResult.UnmappedKey<String>> unmappedKeys = mapKeyResult.getUnmappedKeys();
                assertEquals(unmappedKeys.size(), 1);
            }
            try {
                loadBalancer.getClient(new URIRequest("d2://foo/id=100"), new RequestContext());
                if (partitionMethod == 0) {
                    // key out of range
                    fail("Should throw ServiceUnavailableException caused by PartitionAccessException");
                }
            } catch (ServiceUnavailableException e) {
            }
        }
        final CountDownLatch latch = new CountDownLatch(1);
        PropertyEventShutdownCallback callback = new PropertyEventShutdownCallback() {

            @Override
            public void done() {
                latch.countDown();
            }
        };
        state.shutdown(callback);
        if (!latch.await(60, TimeUnit.SECONDS)) {
            fail("unable to shutdown state");
        }
        executorService.shutdownNow();
        assertTrue(executorService.isShutdown(), "ExecutorService should have shut down!");
    }
}

Example 33 with TransportClientFactory

use of com.linkedin.r2.transport.common.TransportClientFactory in project rest.li by linkedin.

the class SimpleLoadBalancerStateTest method testClientsShutdownAfterPropertyUpdatesRestRequest.

@Test(groups = { "small", "back-end" })
public void testClientsShutdownAfterPropertyUpdatesRestRequest() throws URISyntaxException, InterruptedException {
    reset();
    URI uri = URI.create("http://cluster-1/test");
    List<String> schemes = new ArrayList<>();
    Map<Integer, PartitionData> partitionData = new HashMap<>(1);
    partitionData.put(DefaultPartitionAccessor.DEFAULT_PARTITION_ID, new PartitionData(1d));
    Map<URI, Map<Integer, PartitionData>> uriData = new HashMap<>();
    uriData.put(uri, partitionData);
    schemes.add("http");
    // set up state
    _state.listenToService("service-1", new NullStateListenerCallback());
    _state.listenToCluster("cluster-1", new NullStateListenerCallback());
    _state.setDelayedExecution(0);
    _serviceRegistry.put("service-1", new ServiceProperties("service-1", "cluster-1", "/test", Arrays.asList("random"), Collections.<String, Object>emptyMap(), Collections.<String, Object>emptyMap(), Collections.<String, String>emptyMap(), schemes, Collections.<URI>emptySet()));
    _clusterRegistry.put("cluster-1", new ClusterProperties("cluster-1"));
    _uriRegistry.put("cluster-1", new UriProperties("cluster-1", uriData));
    URI uri1 = URI.create("http://partition-cluster-1/test1");
    URI uri2 = URI.create("http://partition-cluster-1/test2");
    _state.listenToCluster("partition-cluster-1", new NullStateListenerCallback());
    _clusterRegistry.put("partition-cluster-1", new ClusterProperties("partition-cluster-1", null, new HashMap<>(), new HashSet<>(), new RangeBasedPartitionProperties("id=(\\d+)", 0, 100, 2)));
    _state.listenToService("partition-service-1", new NullStateListenerCallback());
    _serviceRegistry.put("partition-service-1", new ServiceProperties("partition-service-1", "partition-cluster-1", "/partition-test", Arrays.asList("degraderV3"), Collections.<String, Object>emptyMap(), Collections.<String, Object>emptyMap(), Collections.<String, String>emptyMap(), schemes, Collections.<URI>emptySet()));
    Map<Integer, PartitionData> partitionWeight = new HashMap<>();
    partitionWeight.put(0, new PartitionData(1d));
    partitionWeight.put(1, new PartitionData(2d));
    Map<URI, Map<Integer, PartitionData>> partitionDesc = new HashMap<>();
    partitionDesc.put(uri1, partitionWeight);
    partitionWeight.remove(0);
    partitionWeight.put(2, new PartitionData(1d));
    partitionDesc.put(uri2, partitionWeight);
    _uriRegistry.put("partition-cluster-1", new UriProperties("partition-cluster-1", partitionDesc));
    TrackerClient client1 = _state.getClient("partition-service-1", uri1);
    TrackerClient client2 = _state.getClient("partition-service-1", uri2);
    assertEquals(client2.getPartitionWeight(1), 2d);
    assertEquals(client2.getPartitionWeight(2), 1d);
    assertEquals(client1.getPartitionWeight(1), 2d);
    // Get client, then refresh cluster
    TrackerClient client = _state.getClient("service-1", uri);
    client.restRequest(new RestRequestBuilder(URI.create("d2://service-1/foo")).build(), new RequestContext(), Collections.emptyMap(), new TransportCallbackAdapter<>(Callbacks.empty()));
    // now force a refresh by adding cluster
    _clusterRegistry.put("cluster-1", new ClusterProperties("cluster-1"));
    // Get client, then refresh service
    client = _state.getClient("service-1", uri);
    client.restRequest(new RestRequestBuilder(URI.create("d2://service-1/foo")).build(), new RequestContext(), Collections.emptyMap(), new TransportCallbackAdapter<>(Callbacks.empty()));
    // refresh by adding service
    _serviceRegistry.put("service-1", new ServiceProperties("service-1", "cluster-1", "/test", Arrays.asList("random"), Collections.<String, Object>emptyMap(), null, null, schemes, null));
    // Get client, then mark server up/down
    client = _state.getClient("service-1", uri);
    client.restRequest(new RestRequestBuilder(URI.create("d2://service-1/foo")).build(), new RequestContext(), Collections.emptyMap(), new TransportCallbackAdapter<>(Callbacks.empty()));
    _uriRegistry.put("cluster-1", new UriProperties("cluster-1", Collections.<URI, Map<Integer, PartitionData>>emptyMap()));
    _uriRegistry.put("cluster-1", new UriProperties("cluster-1", uriData));
    // Get the client one last time
    client = _state.getClient("service-1", uri);
    client.restRequest(new RestRequestBuilder(URI.create("d2://service-1/foo")).build(), new RequestContext(), Collections.emptyMap(), new TransportCallbackAdapter<>(Callbacks.empty()));
    TestShutdownCallback callback = new TestShutdownCallback();
    _state.shutdown(callback);
    assertTrue(callback.await(10, TimeUnit.SECONDS), "Failed to shut down state");
    for (TransportClientFactory factory : _clientFactories.values()) {
        SimpleLoadBalancerTest.DoNothingClientFactory f = (SimpleLoadBalancerTest.DoNothingClientFactory) factory;
        assertEquals(f.getRunningClientCount(), 0, "not all clients were shut down");
    }
}

Example 34 with TransportClientFactory

use of com.linkedin.r2.transport.common.TransportClientFactory in project rest.li by linkedin.

the class SimpleLoadBalancerStateTest method testClientsShutdownAfterPropertyUpdatesStreamRequest.

@Test(groups = { "small", "back-end" })
public void testClientsShutdownAfterPropertyUpdatesStreamRequest() throws URISyntaxException, InterruptedException {
    reset();
    URI uri = URI.create("http://cluster-1/test");
    List<String> schemes = new ArrayList<>();
    Map<Integer, PartitionData> partitionData = new HashMap<>(1);
    partitionData.put(DefaultPartitionAccessor.DEFAULT_PARTITION_ID, new PartitionData(1d));
    Map<URI, Map<Integer, PartitionData>> uriData = new HashMap<>();
    uriData.put(uri, partitionData);
    schemes.add("http");
    // set up state
    _state.listenToService("service-1", new NullStateListenerCallback());
    _state.listenToCluster("cluster-1", new NullStateListenerCallback());
    _state.setDelayedExecution(0);
    _serviceRegistry.put("service-1", new ServiceProperties("service-1", "cluster-1", "/test", Arrays.asList("random"), Collections.<String, Object>emptyMap(), Collections.<String, Object>emptyMap(), Collections.<String, String>emptyMap(), schemes, Collections.<URI>emptySet()));
    _clusterRegistry.put("cluster-1", new ClusterProperties("cluster-1"));
    _uriRegistry.put("cluster-1", new UriProperties("cluster-1", uriData));
    URI uri1 = URI.create("http://partition-cluster-1/test1");
    URI uri2 = URI.create("http://partition-cluster-1/test2");
    _state.listenToCluster("partition-cluster-1", new NullStateListenerCallback());
    _clusterRegistry.put("partition-cluster-1", new ClusterProperties("partition-cluster-1", null, new HashMap<>(), new HashSet<>(), new RangeBasedPartitionProperties("id=(\\d+)", 0, 100, 2)));
    _state.listenToService("partition-service-1", new NullStateListenerCallback());
    _serviceRegistry.put("partition-service-1", new ServiceProperties("partition-service-1", "partition-cluster-1", "/partition-test", Arrays.asList("degraderV3"), Collections.emptyMap(), Collections.emptyMap(), Collections.emptyMap(), schemes, Collections.emptySet()));
    Map<Integer, PartitionData> partitionWeight = new HashMap<>();
    partitionWeight.put(0, new PartitionData(1d));
    partitionWeight.put(1, new PartitionData(2d));
    Map<URI, Map<Integer, PartitionData>> partitionDesc = new HashMap<>();
    partitionDesc.put(uri1, partitionWeight);
    partitionWeight.remove(0);
    partitionWeight.put(2, new PartitionData(1d));
    partitionDesc.put(uri2, partitionWeight);
    _uriRegistry.put("partition-cluster-1", new UriProperties("partition-cluster-1", partitionDesc));
    TrackerClient client1 = _state.getClient("partition-service-1", uri1);
    TrackerClient client2 = _state.getClient("partition-service-1", uri2);
    assertEquals(client2.getPartitionWeight(1), 2d);
    assertEquals(client2.getPartitionWeight(2), 1d);
    assertEquals(client1.getPartitionWeight(1), 2d);
    // Get client, then refresh cluster
    TrackerClient client = _state.getClient("service-1", uri);
    client.streamRequest(new StreamRequestBuilder(URI.create("d2://service-1/foo")).build(EntityStreams.emptyStream()), new RequestContext(), Collections.emptyMap(), new TransportCallbackAdapter<>(Callbacks.empty()));
    // now force a refresh by adding cluster
    _clusterRegistry.put("cluster-1", new ClusterProperties("cluster-1"));
    // Get client, then refresh service
    client = _state.getClient("service-1", uri);
    client.streamRequest(new StreamRequestBuilder(URI.create("d2://service-1/foo")).build(EntityStreams.emptyStream()), new RequestContext(), Collections.emptyMap(), new TransportCallbackAdapter<>(Callbacks.empty()));
    // refresh by adding service
    _serviceRegistry.put("service-1", new ServiceProperties("service-1", "cluster-1", "/test", Arrays.asList("random"), Collections.<String, Object>emptyMap(), null, null, schemes, null));
    // Get client, then mark server up/down
    client = _state.getClient("service-1", uri);
    client.streamRequest(new StreamRequestBuilder(URI.create("d2://service-1/foo")).build(EntityStreams.emptyStream()), new RequestContext(), Collections.emptyMap(), new TransportCallbackAdapter<>(Callbacks.empty()));
    _uriRegistry.put("cluster-1", new UriProperties("cluster-1", Collections.<URI, Map<Integer, PartitionData>>emptyMap()));
    _uriRegistry.put("cluster-1", new UriProperties("cluster-1", uriData));
    // Get the client one last time
    client = _state.getClient("service-1", uri);
    client.streamRequest(new StreamRequestBuilder(URI.create("d2://service-1/foo")).build(EntityStreams.emptyStream()), new RequestContext(), Collections.emptyMap(), new TransportCallbackAdapter<>(Callbacks.empty()));
    TestShutdownCallback callback = new TestShutdownCallback();
    _state.shutdown(callback);
    assertTrue(callback.await(10, TimeUnit.SECONDS), "Failed to shut down state");
    for (TransportClientFactory factory : _clientFactories.values()) {
        SimpleLoadBalancerTest.DoNothingClientFactory f = (SimpleLoadBalancerTest.DoNothingClientFactory) factory;
        assertEquals(f.getRunningClientCount(), 0, "not all clients were shut down");
    }
}

Example 35 with TransportClientFactory

use of com.linkedin.r2.transport.common.TransportClientFactory in project rest.li by linkedin.

the class LoadBalancerEchoClient method getLoadBalancer.

public static SimpleLoadBalancer getLoadBalancer(String hostPort) throws IOException, PropertyStoreException {
    // zk stores
    ZooKeeperPermanentStore<ClusterProperties> zkClusterRegistry = null;
    ZooKeeperPermanentStore<ServiceProperties> zkServiceRegistry = null;
    ZooKeeperEphemeralStore<UriProperties> zkUriRegistry = null;
    ZKConnection zkClient = new ZKConnection(hostPort, 10000);
    zkClusterRegistry = new ZooKeeperPermanentStore<>(zkClient, new ClusterPropertiesJsonSerializer(), _basePath + "/clusters");
    zkServiceRegistry = new ZooKeeperPermanentStore<>(zkClient, new ServicePropertiesJsonSerializer(), _basePath + "/services");
    zkUriRegistry = new ZooKeeperEphemeralStore<>(zkClient, new UriPropertiesJsonSerializer(), new UriPropertiesMerger(), _basePath + "/uris", false, true);
    // fs stores
    File testDirectory = LoadBalancerUtil.createTempDirectory("lb-degrader-witih-file-store-large");
    testDirectory.deleteOnExit();
    new File(testDirectory + File.separator + "cluster").mkdir();
    new File(testDirectory + File.separator + "service").mkdir();
    new File(testDirectory + File.separator + "uri").mkdir();
    FileStore<ClusterProperties> fsClusterStore = new FileStore<>(testDirectory + File.separator + "cluster", FileSystemDirectory.FILE_STORE_EXTENSION, new ClusterPropertiesJsonSerializer());
    FileStore<ServiceProperties> fsServiceStore = new FileStore<>(testDirectory + File.separator + "service", FileSystemDirectory.FILE_STORE_EXTENSION, new ServicePropertiesJsonSerializer());
    FileStore<UriProperties> fsUriStore = new FileStore<>(testDirectory + File.separator + "uri", FileSystemDirectory.FILE_STORE_EXTENSION, new UriPropertiesJsonSerializer());
    // chains
    PropertyEventThread thread = new PropertyEventThread("echo client event thread");
    ScheduledExecutorService executorService = Executors.newSingleThreadScheduledExecutor(new NamedThreadFactory("echo client event thread"));
    // start up the world
    thread.start();
    PropertyEventBus<ServiceProperties> serviceBus = new PropertyEventBusImpl<>(executorService, zkServiceRegistry);
    serviceBus.register(fsServiceStore);
    new ZooKeeperTogglingStore<>(zkServiceRegistry, fsServiceStore, serviceBus, true);
    PropertyEventBus<UriProperties> uriBus = new PropertyEventBusImpl<>(executorService, zkUriRegistry);
    uriBus.register(fsUriStore);
    new ZooKeeperTogglingStore<>(zkUriRegistry, fsUriStore, uriBus, true);
    PropertyEventBus<ClusterProperties> clusterBus = new PropertyEventBusImpl<>(executorService, zkClusterRegistry);
    clusterBus.register(fsClusterStore);
    new ZooKeeperTogglingStore<>(zkClusterRegistry, fsClusterStore, clusterBus, true);
    Map<String, LoadBalancerStrategyFactory<? extends LoadBalancerStrategy>> loadBalancerStrategyFactories = new HashMap<>();
    // strategy and scheme factories
    loadBalancerStrategyFactories.put("degrader", new DegraderLoadBalancerStrategyFactoryV3());
    Map<String, TransportClientFactory> clientFactories = new HashMap<>();
    clientFactories.put("http", new HttpClientFactory.Builder().build());
    // create the state
    SimpleLoadBalancerState state = new SimpleLoadBalancerState(executorService, uriBus, clusterBus, serviceBus, clientFactories, loadBalancerStrategyFactories, null, null, false);
    SimpleLoadBalancer balancer = new SimpleLoadBalancer(state, 5, TimeUnit.SECONDS, executorService);
    new JmxManager().registerLoadBalancer("balancer", balancer).registerLoadBalancerState("state", state);
    return balancer;
}