Examples with LoadBalancerStrategy com.linkedin.d2.balancer.strategies.LoadBalancerStrategy used on opensource projects

Example 21 with LoadBalancerStrategy

use of com.linkedin.d2.balancer.strategies.LoadBalancerStrategy in project rest.li by linkedin.

the class SimpleLoadBalancerStateTest method testGetStrategy.

@Test(groups = { "small", "back-end" })
public void testGetStrategy() throws URISyntaxException {
    reset();
    URI uri = URI.create("http://cluster-1/test");
    List<String> schemes = new ArrayList<String>();
    Map<URI, Double> weights = new HashMap<URI, Double>();
    weights.put(uri, 1d);
    schemes.add("http");
    assertNull(_state.getStrategy("service-1", "http"));
    // set up state
    _state.listenToService("service-1", new NullStateListenerCallback());
    assertNull(_state.getStrategy("service-1", "http"));
    _serviceRegistry.put("service-1", new ServiceProperties("service-1", "cluster-1", "/test", Arrays.asList("random"), Collections.<String, Object>emptyMap(), null, null, schemes, null));
    LoadBalancerStrategy strategy = _state.getStrategy("service-1", "http");
    assertNotNull(strategy);
    assertTrue(strategy instanceof RandomLoadBalancerStrategy);
}

Example 22 with LoadBalancerStrategy

use of com.linkedin.d2.balancer.strategies.LoadBalancerStrategy in project rest.li by linkedin.

the class SimpleLoadBalancerStateTest method testRefreshServiceStrategies.

@Test(groups = { "small", "back-end" })
public void testRefreshServiceStrategies() throws URISyntaxException, InterruptedException {
    reset();
    URI uri = URI.create("http://cluster-1/test");
    List<String> schemes = new ArrayList<String>();
    Map<URI, Double> weights = new HashMap<URI, Double>();
    weights.put(uri, 1d);
    schemes.add("http");
    assertNull(_state.getStrategy("service-1", "http"));
    // set up state
    _state.listenToService("service-1", new NullStateListenerCallback());
    _state.listenToCluster("cluster-1", new NullStateListenerCallback());
    assertNull(_state.getStrategy("service-1", "http"));
    _serviceRegistry.put("service-1", new ServiceProperties("service-1", "cluster-1", "/test", Arrays.asList("random"), Collections.<String, Object>emptyMap(), null, null, schemes, null));
    assertNotNull(_state.getStrategy("service-1", "http"));
    LoadBalancerStrategy strategy = _state.getStrategy("service-1", "http");
    assertNotNull(strategy);
    assertTrue(strategy instanceof RandomLoadBalancerStrategy);
    // check that we're getting the exact same strategy (by pointer) every time
    assertTrue(strategy == _state.getStrategy("service-1", "http"));
    assertTrue(strategy == _state.getStrategy("service-1", "http"));
    // now make sure adding a cluster property won't change the strategy
    _clusterRegistry.put("cluster-1", new ClusterProperties("cluster-1"));
    // we should still have the same strategy now
    LoadBalancerStrategy newStrategy = _state.getStrategy("service-1", "http");
    assertNotNull(newStrategy);
    assertTrue(strategy == newStrategy);
    assertTrue(newStrategy instanceof RandomLoadBalancerStrategy);
    strategy = newStrategy;
    // 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));
    // we should have a different strategy
    newStrategy = _state.getStrategy("service-1", "http");
    assertNotNull(newStrategy);
    assertFalse(strategy == newStrategy);
    assertTrue(newStrategy instanceof RandomLoadBalancerStrategy);
    TestShutdownCallback callback = new TestShutdownCallback();
    _state.shutdown(callback);
    assertTrue(callback.await(10, TimeUnit.SECONDS), "Failed to shut down state");
}

Example 23 with LoadBalancerStrategy

use of com.linkedin.d2.balancer.strategies.LoadBalancerStrategy in project rest.li by linkedin.

the class SimpleLoadBalancerStrawMan method main.

public static void main(String[] args) throws URISyntaxException, ServiceUnavailableException {
    // define the load balancing strategies that we support (round robin, etc)
    Map<String, LoadBalancerStrategyFactory<? extends LoadBalancerStrategy>> loadBalancerStrategyFactories = new HashMap<String, LoadBalancerStrategyFactory<? extends LoadBalancerStrategy>>();
    loadBalancerStrategyFactories.put("rr", new RandomLoadBalancerStrategyFactory());
    loadBalancerStrategyFactories.put("degrader", new DegraderLoadBalancerStrategyFactoryV3());
    // define the clients that we support (http, etc)
    Map<String, TransportClientFactory> clientFactories = new HashMap<String, TransportClientFactory>();
    clientFactories.put("http", new HttpClientFactory());
    // listen for service updates (could be a glu discovery client, zk discovery client,
    // config discovery client, etc)
    ScheduledExecutorService executorService = Executors.newSingleThreadScheduledExecutor();
    MockStore<ServiceProperties> serviceRegistry = new MockStore<ServiceProperties>();
    MockStore<ClusterProperties> clusterRegistry = new MockStore<ClusterProperties>();
    MockStore<UriProperties> uriRegistry = new MockStore<UriProperties>();
    SimpleLoadBalancerState state = new SimpleLoadBalancerState(executorService, uriRegistry, clusterRegistry, serviceRegistry, clientFactories, loadBalancerStrategyFactories);
    // create the load balancer
    SimpleLoadBalancer loadBalancer = new SimpleLoadBalancer(state);
    final TransportClient tc = loadBalancer.getClient(new URIRequest("d2://browsemaps/52"), new RequestContext());
    final Client c = new TransportClientAdapter(tc, true);
    c.restRequest(null);
}

Example 24 with LoadBalancerStrategy

use of com.linkedin.d2.balancer.strategies.LoadBalancerStrategy 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<String, LoadBalancerStrategyFactory<? extends LoadBalancerStrategy>>();
        Map<String, TransportClientFactory> clientFactories = new HashMap<String, TransportClientFactory>();
        List<String> prioritizedSchemes = new ArrayList<String>();
        MockStore<ServiceProperties> serviceRegistry = new MockStore<ServiceProperties>();
        MockStore<ClusterProperties> clusterRegistry = new MockStore<ClusterProperties>();
        MockStore<UriProperties> uriRegistry = new MockStore<UriProperties>();
        ScheduledExecutorService executorService = Executors.newSingleThreadScheduledExecutor();
        loadBalancerStrategyFactories.put("degrader", new DegraderLoadBalancerStrategyFactoryV3());
        clientFactories.put("http", new DoNothingClientFactory());
        SimpleLoadBalancerState state = new SimpleLoadBalancerState(executorService, uriRegistry, clusterRegistry, serviceRegistry, clientFactories, loadBalancerStrategyFactories);
        SimpleLoadBalancer loadBalancer = new SimpleLoadBalancer(state, 5, TimeUnit.SECONDS);
        FutureCallback<None> balancerCallback = new FutureCallback<None>();
        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<URI, Double>();
        uris.put(uri1, 1d);
        uris.put(uri2, 1d);
        uris.put(uri3, 1d);
        Map<URI, Map<Integer, PartitionData>> partitionDesc = new HashMap<URI, Map<Integer, PartitionData>>();
        Map<Integer, PartitionData> server1 = new HashMap<Integer, PartitionData>();
        server1.put(0, new PartitionData(1d));
        server1.put(1, new PartitionData(1d));
        Map<Integer, PartitionData> server2 = new HashMap<Integer, PartitionData>();
        server2.put(0, new PartitionData(1d));
        Map<Integer, PartitionData> server3 = new HashMap<Integer, PartitionData>();
        server3.put(1, new PartitionData(1d));
        partitionDesc.put(uri1, server1);
        partitionDesc.put(uri2, server2);
        partitionDesc.put(uri3, server3);
        prioritizedSchemes.add("http");
        int partitionMethod = tryAgain % 4;
        switch(partitionMethod) {
            case 0:
                clusterRegistry.put("cluster-1", new ClusterProperties("cluster-1", null, new HashMap<String, String>(), new HashSet<URI>(), new RangeBasedPartitionProperties("id=(\\d+)", 0, 50, 2)));
                break;
            case 1:
                clusterRegistry.put("cluster-1", new ClusterProperties("cluster-1", null, new HashMap<String, String>(), new HashSet<URI>(), new HashBasedPartitionProperties("id=(\\d+)", 2, HashBasedPartitionProperties.HashAlgorithm.valueOf("MODULO"))));
                break;
            case 2:
                clusterRegistry.put("cluster-1", new ClusterProperties("cluster-1", null, new HashMap<String, String>(), new HashSet<URI>(), 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<String, String>(), new HashSet<URI>(), 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.<String, Object>emptyMap(), 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<URI>(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<URI>();
        expectedUris.add(expectedUri1);
        expectedUris.add(expectedUri2);
        expectedUris.add(expectedUri3);
        for (int i = 0; i < 1000; ++i) {
            int ii = i % 100;
            RewriteClient client = (RewriteClient) 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);
            RewriteClient hintedClient1 = (RewriteClient) loadBalancer.getClient(new URIRequest("d2://foo/id=" + ii), requestContextWithHint);
            String hintedUri1 = hintedClient1.getUri().toString();
            Assert.assertEquals(hintedUri1, uri1.toString() + "/foo");
            RewriteClient hintedClient2 = (RewriteClient) 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<String>();
            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 25 with LoadBalancerStrategy

use of com.linkedin.d2.balancer.strategies.LoadBalancerStrategy in project rest.li by linkedin.

the class SimpleLoadBalancerSimulation method reset.

/**
   * Reset the entire state of the simulation.
   *
   */
public void reset() {
    // simulation state
    _random = new Random();
    _possibleServices = Collections.synchronizedList(new ArrayList<String>());
    _possibleClusters = Collections.synchronizedList(new ArrayList<String>());
    _possiblePaths = Collections.synchronizedList(new ArrayList<String>());
    _possibleSchemes = Collections.synchronizedList(new ArrayList<String>());
    _possibleStrategies = Collections.synchronizedList(new ArrayList<String>());
    _possibleUris = Collections.synchronizedList(new ArrayList<URI>());
    // load balancer state
    _executorService = Executors.newSingleThreadScheduledExecutor();
    ;
    // pretend that these are zk stores
    _serviceRegistry = new MockStore<ServiceProperties>();
    _uriRegistry = new MockStore<UriProperties>();
    _clusterRegistry = new MockStore<ClusterProperties>();
    _loadBalancerStrategyFactories = new HashMap<String, LoadBalancerStrategyFactory<? extends LoadBalancerStrategy>>();
    _clientFactories = new HashMap<String, TransportClientFactory>();
    _state = new SimpleLoadBalancerState(_executorService, _uriRegistry, _clusterRegistry, _serviceRegistry, _clientFactories, _loadBalancerStrategyFactories);
    _loadBalancer = new SimpleLoadBalancer(_state, 10, TimeUnit.SECONDS);
    FutureCallback<None> callback = new FutureCallback<None>();
    _loadBalancer.start(callback);
    try {
        callback.get();
    } catch (Exception e) {
        throw new RuntimeException("Balancer start failed", e);
    }
    // verification state
    _expectedServiceProperties = new ConcurrentHashMap<String, ServiceProperties>();
    _expectedClusterProperties = new ConcurrentHashMap<String, ClusterProperties>();
    _expectedUriProperties = new ConcurrentHashMap<String, UriProperties>();
    _totalMessages = 0;
    // TODO parameterize this
    for (int i = 0; i < 10; ++i) {
        _possibleServices.add("service-" + i);
        _possibleClusters.add("cluster-" + i);
        _possiblePaths.add("/some/path/" + i);
        _possibleSchemes.add("scheme" + i % 3);
        _possibleStrategies.add("strategy-" + i);
        _clientFactories.put("scheme" + i % 2, new DoNothingClientFactory());
        _loadBalancerStrategyFactories.put("strategy-" + i, _loadBalancerStrategyFactoryToTest);
    }
    for (int i = 0; i < 1000; ++i) {
        _possibleUris.add(URI.create(random(_possibleSchemes) + "://host" + i % 100 + ":" + (1000 + _random.nextInt(1000)) + random(_possiblePaths)));
    }
    // add bad stuff
    // add a bad scheme to prioritized schemes
    _possibleSchemes.add("BAD_PRIORITIZED_SCHEME");
    // add a bad scheme to possible uris
    _possibleUris.add(URI.create("BADSCHEME://host1001:" + (1000 + _random.nextInt(1000)) + random(_possiblePaths)));
    // register jmx goodies
    new JmxManager().registerLoadBalancer("SimpleLoadBalancer", _loadBalancer).registerLoadBalancerState("SimpleLoadBalancerState", _state);
}