@Test
  public void testStateTransition()
      throws InterruptedException, ExecutionException, TimeoutException {
    InMemoryZKServer zkServer = InMemoryZKServer.builder().build();
    zkServer.startAndWait();

    try {
      final String namespace =
          Joiner.on('/').join("/twill", RunIds.generate(), "runnables", "Runner1");

      final ZKClientService zkClient =
          ZKClientService.Builder.of(zkServer.getConnectionStr()).build();
      zkClient.startAndWait();
      zkClient.create(namespace, null, CreateMode.PERSISTENT).get();

      try {
        JsonObject content = new JsonObject();
        content.addProperty("containerId", "container-123");
        content.addProperty("host", "localhost");

        RunId runId = RunIds.generate();
        final Semaphore semaphore = new Semaphore(0);
        ZKServiceDecorator service =
            new ZKServiceDecorator(
                ZKClients.namespace(zkClient, namespace),
                runId,
                Suppliers.ofInstance(content),
                new AbstractIdleService() {
                  @Override
                  protected void startUp() throws Exception {
                    Preconditions.checkArgument(
                        semaphore.tryAcquire(5, TimeUnit.SECONDS), "Fail to start");
                  }

                  @Override
                  protected void shutDown() throws Exception {
                    Preconditions.checkArgument(
                        semaphore.tryAcquire(5, TimeUnit.SECONDS), "Fail to stop");
                  }
                });

        final String runnablePath = namespace + "/" + runId.getId();
        final AtomicReference<String> stateMatch = new AtomicReference<String>("STARTING");
        watchDataChange(zkClient, runnablePath + "/state", semaphore, stateMatch);
        Assert.assertEquals(Service.State.RUNNING, service.start().get(5, TimeUnit.SECONDS));

        stateMatch.set("STOPPING");
        Assert.assertEquals(Service.State.TERMINATED, service.stop().get(5, TimeUnit.SECONDS));

      } finally {
        zkClient.stopAndWait();
      }
    } finally {
      zkServer.stopAndWait();
    }
  }
示例#2
0
  BasicFlowletContext(
      Program program,
      final String flowletId,
      int instanceId,
      RunId runId,
      int instanceCount,
      Set<String> datasets,
      Arguments runtimeArguments,
      FlowletSpecification flowletSpec,
      MetricsCollectionService metricsCollectionService,
      DiscoveryServiceClient discoveryServiceClient,
      DatasetFramework dsFramework) {
    super(
        program,
        runId,
        runtimeArguments,
        datasets,
        getMetricCollector(metricsCollectionService, program, flowletId, runId.getId(), instanceId),
        dsFramework,
        discoveryServiceClient);
    this.namespaceId = program.getNamespaceId();
    this.flowId = program.getName();
    this.flowletId = flowletId;
    this.groupId = FlowUtils.generateConsumerGroupId(program, flowletId);
    this.instanceId = instanceId;
    this.instanceCount = instanceCount;
    this.flowletSpec = flowletSpec;
    this.userMetrics =
        new ProgramUserMetrics(
            getMetricCollector(
                metricsCollectionService, program, flowletId, runId.getId(), instanceId));
    // TODO - does this have to cache the metric collectors? Metrics framework itself has a cache
    // [CDAP-2334]
    this.queueMetrics =
        CacheBuilder.newBuilder()
            .expireAfterAccess(1, TimeUnit.HOURS)
            .build(
                new CacheLoader<String, MetricsContext>() {
                  @Override
                  public MetricsContext load(String key) throws Exception {
                    return getProgramMetrics()
                        .childContext(Constants.Metrics.Tag.FLOWLET_QUEUE, key);
                  }
                });

    this.producerMetrics =
        CacheBuilder.newBuilder()
            .expireAfterAccess(1, TimeUnit.HOURS)
            .build(
                new CacheLoader<ImmutablePair<String, String>, MetricsContext>() {
                  @Override
                  public MetricsContext load(ImmutablePair<String, String> key) throws Exception {
                    return getProgramMetrics()
                        .childContext(
                            ImmutableMap.of(
                                Constants.Metrics.Tag.PRODUCER, key.getFirst(),
                                Constants.Metrics.Tag.FLOWLET_QUEUE, key.getSecond(),
                                Constants.Metrics.Tag.CONSUMER,
                                    BasicFlowletContext.this.flowletId));
                  }
                });
  }
 private OperationFuture<String> removeServiceNode() {
   String serviceNode = String.format("/%s", id.getId());
   LOG.info("Remove service node {}{}", zkClient.getConnectString(), serviceNode);
   return ZKOperations.recursiveDelete(zkClient, serviceNode);
 }