Examples with EndOfStreamMessage org.apache.samza.system.EndOfStreamMessage used on opensource projects

Example 1 with EndOfStreamMessage

use of org.apache.samza.system.EndOfStreamMessage in project samza by apache.

the class StreamOperatorTask method processAsync.

/**
 * Passes the incoming message envelopes along to the {@link InputOperatorImpl} node
 * for the input {@link SystemStream}. It is non-blocking and dispatches the message to the container thread
 * pool. The thread pool size is configured through job.container.thread.pool.size. In the absence of the config,
 * the task executes the DAG on the run loop thread.
 * <p>
 * From then on, each {@link org.apache.samza.operators.impl.OperatorImpl} propagates its transformed output to
 * its chained {@link org.apache.samza.operators.impl.OperatorImpl}s itself.
 *
 * @param ime incoming message envelope to process
 * @param collector the collector to send messages with
 * @param coordinator the coordinator to request commits or shutdown
 * @param callback the task callback handle
 */
@Override
public final void processAsync(IncomingMessageEnvelope ime, MessageCollector collector, TaskCoordinator coordinator, TaskCallback callback) {
    Runnable processRunnable = () -> {
        try {
            SystemStream systemStream = ime.getSystemStreamPartition().getSystemStream();
            InputOperatorImpl inputOpImpl = operatorImplGraph.getInputOperator(systemStream);
            if (inputOpImpl != null) {
                CompletionStage<Void> processFuture;
                MessageType messageType = MessageType.of(ime.getMessage());
                switch(messageType) {
                    case USER_MESSAGE:
                        processFuture = inputOpImpl.onMessageAsync(ime, collector, coordinator);
                        break;
                    case END_OF_STREAM:
                        EndOfStreamMessage eosMessage = (EndOfStreamMessage) ime.getMessage();
                        processFuture = inputOpImpl.aggregateEndOfStream(eosMessage, ime.getSystemStreamPartition(), collector, coordinator);
                        break;
                    case WATERMARK:
                        WatermarkMessage watermarkMessage = (WatermarkMessage) ime.getMessage();
                        processFuture = inputOpImpl.aggregateWatermark(watermarkMessage, ime.getSystemStreamPartition(), collector, coordinator);
                        break;
                    default:
                        processFuture = failedFuture(new SamzaException("Unknown message type " + messageType + " encountered."));
                        break;
                }
                processFuture.whenComplete((val, ex) -> {
                    if (ex != null) {
                        callback.failure(ex);
                    } else {
                        callback.complete();
                    }
                });
            } else {
                // If InputOperator is not found in the operator graph for a given SystemStream, throw an exception else the
                // job will timeout due to async task callback timeout (TaskCallbackTimeoutException)
                final String errMessage = String.format("InputOperator not found in OperatorGraph for %s. The available input" + " operators are: %s. Please check SystemStream configuration for the `SystemConsumer` and/or task.inputs" + " task configuration.", systemStream, operatorImplGraph.getAllInputOperators());
                LOG.error(errMessage);
                callback.failure(new SamzaException(errMessage));
            }
        } catch (Exception e) {
            LOG.error("Failed to process the incoming message due to ", e);
            callback.failure(e);
        }
    };
    if (taskThreadPool != null) {
        LOG.debug("Processing message using thread pool.");
        taskThreadPool.submit(processRunnable);
    } else {
        LOG.debug("Processing message on the run loop thread.");
        processRunnable.run();
    }
}

Example 2 with EndOfStreamMessage

use of org.apache.samza.system.EndOfStreamMessage in project samza by apache.

the class IntermediateMessageSerde method toBytes.

@Override
public byte[] toBytes(Object object) {
    final byte[] data;
    final MessageType type = MessageType.of(object);
    switch(type) {
        case USER_MESSAGE:
            data = userMessageSerde.toBytes(object);
            break;
        case WATERMARK:
            data = watermarkSerde.toBytes((WatermarkMessage) object);
            break;
        case END_OF_STREAM:
            data = eosSerde.toBytes((EndOfStreamMessage) object);
            break;
        default:
            throw new SamzaException("Unknown message type: " + type.name());
    }
    final byte[] bytes = new byte[data.length + 1];
    bytes[0] = (byte) type.ordinal();
    System.arraycopy(data, 0, bytes, 1, data.length);
    return bytes;
}

Example 3 with EndOfStreamMessage

use of org.apache.samza.system.EndOfStreamMessage in project samza by apache.

the class TestInMemorySystem method testEndOfStreamMessageWithoutTask.

@Test
public void testEndOfStreamMessageWithoutTask() {
    EndOfStreamMessage eos = new EndOfStreamMessage();
    produceMessages(eos);
    Set<SystemStreamPartition> sspsToPoll = IntStream.range(0, PARTITION_COUNT).mapToObj(partition -> new SystemStreamPartition(SYSTEM_STREAM, new Partition(partition))).collect(Collectors.toSet());
    List<IncomingMessageEnvelope> results = consumeRawMessages(sspsToPoll);
    assertEquals(1, results.size());
    assertNull(((EndOfStreamMessage) results.get(0).getMessage()).getTaskName());
    assertTrue(results.get(0).isEndOfStream());
}

Example 4 with EndOfStreamMessage

use of org.apache.samza.system.EndOfStreamMessage in project samza by apache.

the class TestInMemorySystem method testEndOfStreamMessageWithTask.

@Test
public void testEndOfStreamMessageWithTask() {
    EndOfStreamMessage eos = new EndOfStreamMessage("test-task");
    produceMessages(eos);
    Set<SystemStreamPartition> sspsToPoll = IntStream.range(0, PARTITION_COUNT).mapToObj(partition -> new SystemStreamPartition(SYSTEM_STREAM, new Partition(partition))).collect(Collectors.toSet());
    List<IncomingMessageEnvelope> results = consumeRawMessages(sspsToPoll);
    assertEquals(1, results.size());
    assertEquals("test-task", ((EndOfStreamMessage) results.get(0).getMessage()).getTaskName());
    assertFalse(results.get(0).isEndOfStream());
}

Example 5 with EndOfStreamMessage

use of org.apache.samza.system.EndOfStreamMessage in project samza by apache.

the class TestRunner method initializeInMemoryInputStream.

/**
 * Creates an in memory stream with {@link InMemorySystemFactory} and feeds its partition with stream of messages
 * @param partitionData key of the map represents partitionId and value represents messages in the partition
 * @param descriptor describes a stream to initialize with the in memory system
 */
private <StreamMessageType> void initializeInMemoryInputStream(InMemoryInputDescriptor<?> descriptor, Map<Integer, Iterable<StreamMessageType>> partitionData) {
    String systemName = descriptor.getSystemName();
    String streamName = (String) descriptor.getPhysicalName().orElse(descriptor.getStreamId());
    if (this.app instanceof LegacyTaskApplication) {
        // for legacy applications that only specify task.class.
        if (configs.containsKey(TaskConfig.INPUT_STREAMS)) {
            configs.put(TaskConfig.INPUT_STREAMS, configs.get(TaskConfig.INPUT_STREAMS).concat("," + systemName + "." + streamName));
        } else {
            configs.put(TaskConfig.INPUT_STREAMS, systemName + "." + streamName);
        }
    }
    InMemorySystemDescriptor imsd = (InMemorySystemDescriptor) descriptor.getSystemDescriptor();
    imsd.withInMemoryScope(this.inMemoryScope);
    addConfig(descriptor.toConfig());
    addConfig(descriptor.getSystemDescriptor().toConfig());
    addSerdeConfigs(descriptor);
    StreamSpec spec = new StreamSpec(descriptor.getStreamId(), streamName, systemName, partitionData.size());
    SystemFactory factory = new InMemorySystemFactory();
    Config config = new MapConfig(descriptor.toConfig(), descriptor.getSystemDescriptor().toConfig());
    factory.getAdmin(systemName, config).createStream(spec);
    InMemorySystemProducer producer = (InMemorySystemProducer) factory.getProducer(systemName, config, null);
    SystemStream sysStream = new SystemStream(systemName, streamName);
    partitionData.forEach((partitionId, partition) -> {
        partition.forEach(e -> {
            Object key = e instanceof KV ? ((KV) e).getKey() : null;
            Object value = e instanceof KV ? ((KV) e).getValue() : e;
            if (value instanceof IncomingMessageEnvelope) {
                producer.send((IncomingMessageEnvelope) value);
            } else {
                producer.send(systemName, new OutgoingMessageEnvelope(sysStream, Integer.valueOf(partitionId), key, value));
            }
        });
        producer.send(systemName, new OutgoingMessageEnvelope(sysStream, Integer.valueOf(partitionId), null, new EndOfStreamMessage(null)));
    });
}