Examples with EventStreamReader io.pravega.client.stream.EventStreamReader used on opensource projects

Example 1 with EventStreamReader

use of io.pravega.client.stream.EventStreamReader in project pravega by pravega.

the class StreamTransactionMetadataTasksTest method failOverTests.

@Test
public void failOverTests() throws CheckpointStoreException, InterruptedException {
    // Create mock writer objects.
    EventStreamWriterMock<CommitEvent> commitWriter = new EventStreamWriterMock<>();
    EventStreamWriterMock<AbortEvent> abortWriter = new EventStreamWriterMock<>();
    EventStreamReader<CommitEvent> commitReader = commitWriter.getReader();
    EventStreamReader<AbortEvent> abortReader = abortWriter.getReader();
    consumer = new ControllerService(streamStore, hostStore, streamMetadataTasks, txnTasks, segmentHelperMock, executor, null);
    // Create test scope and stream.
    final ScalingPolicy policy1 = ScalingPolicy.fixed(2);
    final StreamConfiguration configuration1 = StreamConfiguration.builder().scope(SCOPE).streamName(STREAM).scalingPolicy(policy1).build();
    Assert.assertEquals(Controller.CreateScopeStatus.Status.SUCCESS, consumer.createScope(SCOPE).join().getStatus());
    Assert.assertEquals(Controller.CreateStreamStatus.Status.SUCCESS, streamMetadataTasks.createStream(SCOPE, STREAM, configuration1, System.currentTimeMillis()).join());
    // Set up txn task for creating transactions from a failedHost.
    StreamTransactionMetadataTasks failedTxnTasks = new StreamTransactionMetadataTasks(streamStore, hostStore, segmentHelperMock, executor, "failedHost", connectionFactory, false, "");
    failedTxnTasks.initializeStreamWriters("commitStream", new EventStreamWriterMock<>(), "abortStream", new EventStreamWriterMock<>());
    // Create 3 transactions from failedHost.
    VersionedTransactionData tx1 = failedTxnTasks.createTxn(SCOPE, STREAM, 10000, 10000, null).join().getKey();
    VersionedTransactionData tx2 = failedTxnTasks.createTxn(SCOPE, STREAM, 10000, 10000, null).join().getKey();
    VersionedTransactionData tx3 = failedTxnTasks.createTxn(SCOPE, STREAM, 10000, 10000, null).join().getKey();
    // Ping another txn from failedHost.
    UUID txnId = UUID.randomUUID();
    streamStore.createTransaction(SCOPE, STREAM, txnId, 10000, 30000, 30000, null, executor).join();
    PingTxnStatus pingStatus = failedTxnTasks.pingTxn(SCOPE, STREAM, txnId, 10000, null).join();
    VersionedTransactionData tx4 = streamStore.getTransactionData(SCOPE, STREAM, txnId, null, executor).join();
    // Validate versions of all txn
    Assert.assertEquals(0, tx1.getVersion());
    Assert.assertEquals(0, tx2.getVersion());
    Assert.assertEquals(0, tx3.getVersion());
    Assert.assertEquals(1, tx4.getVersion());
    Assert.assertEquals(PingTxnStatus.Status.OK, pingStatus.getStatus());
    // Validate the txn index.
    Assert.assertEquals(1, streamStore.listHostsOwningTxn().join().size());
    // Change state of one txn to COMMITTING.
    TxnStatus txnStatus2 = streamStore.sealTransaction(SCOPE, STREAM, tx2.getId(), true, Optional.empty(), null, executor).thenApply(AbstractMap.SimpleEntry::getKey).join();
    Assert.assertEquals(TxnStatus.COMMITTING, txnStatus2);
    // Change state of another txn to ABORTING.
    TxnStatus txnStatus3 = streamStore.sealTransaction(SCOPE, STREAM, tx3.getId(), false, Optional.empty(), null, executor).thenApply(AbstractMap.SimpleEntry::getKey).join();
    Assert.assertEquals(TxnStatus.ABORTING, txnStatus3);
    // Create transaction tasks for sweeping txns from failedHost.
    txnTasks = new StreamTransactionMetadataTasks(streamStore, hostStore, segmentHelperMock, executor, "host", connectionFactory, false, "");
    TxnSweeper txnSweeper = new TxnSweeper(streamStore, txnTasks, 100, executor);
    // Before initializing, txnSweeper.sweepFailedHosts would throw an error
    AssertExtensions.assertThrows("IllegalStateException before initialization", txnSweeper.sweepFailedProcesses(() -> Collections.singleton("host")), ex -> ex instanceof IllegalStateException);
    // Initialize stream writers.
    txnTasks.initializeStreamWriters("commitStream", commitWriter, "abortStream", abortWriter);
    // Validate that txnTasks is ready.
    assertTrue(txnTasks.isReady());
    // Sweep txns that were being managed by failedHost.
    txnSweeper.sweepFailedProcesses(() -> Collections.singleton("host")).join();
    // Validate that sweeping completes correctly.
    Assert.assertEquals(0, streamStore.listHostsOwningTxn().join().size());
    Assert.assertEquals(TxnStatus.ABORTING, streamStore.transactionStatus(SCOPE, STREAM, tx1.getId(), null, executor).join());
    Assert.assertEquals(TxnStatus.COMMITTING, streamStore.transactionStatus(SCOPE, STREAM, tx2.getId(), null, executor).join());
    Assert.assertEquals(TxnStatus.ABORTING, streamStore.transactionStatus(SCOPE, STREAM, tx3.getId(), null, executor).join());
    Assert.assertEquals(TxnStatus.ABORTING, streamStore.transactionStatus(SCOPE, STREAM, tx4.getId(), null, executor).join());
    // Create commit and abort event processors.
    ConnectionFactory connectionFactory = Mockito.mock(ConnectionFactory.class);
    BlockingQueue<CommitEvent> processedCommitEvents = new LinkedBlockingQueue<>();
    BlockingQueue<AbortEvent> processedAbortEvents = new LinkedBlockingQueue<>();
    createEventProcessor("commitRG", "commitStream", commitReader, commitWriter, () -> new CommitEventProcessor(streamStore, streamMetadataTasks, hostStore, executor, segmentHelperMock, connectionFactory, processedCommitEvents));
    createEventProcessor("abortRG", "abortStream", abortReader, abortWriter, () -> new ConcurrentEventProcessor<>(new AbortRequestHandler(streamStore, streamMetadataTasks, hostStore, executor, segmentHelperMock, connectionFactory, processedAbortEvents), executor));
    // Wait until the commit event is processed and ensure that the txn state is COMMITTED.
    CommitEvent commitEvent = processedCommitEvents.take();
    assertEquals(tx2.getId(), commitEvent.getTxid());
    assertEquals(TxnStatus.COMMITTED, streamStore.transactionStatus(SCOPE, STREAM, tx2.getId(), null, executor).join());
    // Wait until 3 abort events are processed and ensure that the txn state is ABORTED.
    Predicate<AbortEvent> predicate = event -> event.getTxid().equals(tx1.getId()) || event.getTxid().equals(tx3.getId()) || event.getTxid().equals(tx4.getId());
    AbortEvent abortEvent1 = processedAbortEvents.take();
    assertTrue(predicate.test(abortEvent1));
    AbortEvent abortEvent2 = processedAbortEvents.take();
    assertTrue(predicate.test(abortEvent2));
    AbortEvent abortEvent3 = processedAbortEvents.take();
    assertTrue(predicate.test(abortEvent3));
    assertEquals(TxnStatus.ABORTED, streamStore.transactionStatus(SCOPE, STREAM, tx1.getId(), null, executor).join());
    assertEquals(TxnStatus.ABORTED, streamStore.transactionStatus(SCOPE, STREAM, tx3.getId(), null, executor).join());
    assertEquals(TxnStatus.ABORTED, streamStore.transactionStatus(SCOPE, STREAM, tx4.getId(), null, executor).join());
}

Example 2 with EventStreamReader

use of io.pravega.client.stream.EventStreamReader in project pravega by pravega.

the class ReaderGroupNotificationTest method testEndOfStreamNotifications.

@Test(timeout = 40000)
public void testEndOfStreamNotifications() throws Exception {
    final String streamName = "stream2";
    StreamConfiguration config = StreamConfiguration.builder().scope(SCOPE).streamName(streamName).scalingPolicy(ScalingPolicy.byEventRate(10, 2, 1)).build();
    Controller controller = controllerWrapper.getController();
    controllerWrapper.getControllerService().createScope(SCOPE).get();
    controller.createStream(config).get();
    @Cleanup ConnectionFactory connectionFactory = new ConnectionFactoryImpl(ClientConfig.builder().controllerURI(URI.create("tcp://localhost")).build());
    @Cleanup ClientFactory clientFactory = new ClientFactoryImpl(SCOPE, controller, connectionFactory);
    @Cleanup EventStreamWriter<String> writer = clientFactory.createEventWriter(streamName, new JavaSerializer<>(), EventWriterConfig.builder().build());
    writer.writeEvent("0", "data1").get();
    // scale
    Stream stream = new StreamImpl(SCOPE, streamName);
    Map<Double, Double> map = new HashMap<>();
    map.put(0.0, 0.5);
    map.put(0.5, 1.0);
    Boolean result = controller.scaleStream(stream, Collections.singletonList(0), map, executor).getFuture().get();
    assertTrue(result);
    writer.writeEvent("0", "data2").get();
    // seal stream
    assertTrue(controller.sealStream(SCOPE, streamName).get());
    @Cleanup ReaderGroupManager groupManager = new ReaderGroupManagerImpl(SCOPE, controller, clientFactory, connectionFactory);
    ReaderGroup readerGroup = groupManager.createReaderGroup("reader", ReaderGroupConfig.builder().disableAutomaticCheckpoints().stream(Stream.of(SCOPE, streamName)).build());
    @Cleanup EventStreamReader<String> reader1 = clientFactory.createReader("readerId", "reader", new JavaSerializer<>(), ReaderConfig.builder().build());
    // Add segment event listener
    Listener<EndOfDataNotification> l1 = notification -> {
        listenerInvoked.set(true);
        listenerLatch.release();
    };
    readerGroup.getEndOfDataNotifier(executor).registerListener(l1);
    EventRead<String> event1 = reader1.readNextEvent(10000);
    EventRead<String> event2 = reader1.readNextEvent(10000);
    EventRead<String> event3 = reader1.readNextEvent(10000);
    assertNotNull(event1);
    assertEquals("data1", event1.getEvent());
    assertNotNull(event2);
    assertEquals("data2", event2.getEvent());
    assertNull(event3.getEvent());
    listenerLatch.await();
    assertTrue("Listener invoked", listenerInvoked.get());
}

Example 3 with EventStreamReader

use of io.pravega.client.stream.EventStreamReader in project pravega by pravega.

the class ReaderGroupNotificationTest method testSegmentNotifications.

@Test(timeout = 40000)
public void testSegmentNotifications() throws Exception {
    final String streamName = "stream1";
    StreamConfiguration config = StreamConfiguration.builder().scope(SCOPE).streamName(streamName).scalingPolicy(ScalingPolicy.byEventRate(10, 2, 1)).build();
    Controller controller = controllerWrapper.getController();
    controllerWrapper.getControllerService().createScope(SCOPE).get();
    controller.createStream(config).get();
    @Cleanup ConnectionFactory connectionFactory = new ConnectionFactoryImpl(ClientConfig.builder().controllerURI(URI.create("tcp://localhost")).build());
    @Cleanup ClientFactory clientFactory = new ClientFactoryImpl(SCOPE, controller, connectionFactory);
    @Cleanup EventStreamWriter<String> writer = clientFactory.createEventWriter(streamName, new JavaSerializer<>(), EventWriterConfig.builder().build());
    writer.writeEvent("0", "data1").get();
    // scale
    Stream stream = new StreamImpl(SCOPE, streamName);
    Map<Double, Double> map = new HashMap<>();
    map.put(0.0, 0.5);
    map.put(0.5, 1.0);
    Boolean result = controller.scaleStream(stream, Collections.singletonList(0), map, executor).getFuture().get();
    assertTrue(result);
    writer.writeEvent("0", "data2").get();
    @Cleanup ReaderGroupManager groupManager = new ReaderGroupManagerImpl(SCOPE, controller, clientFactory, connectionFactory);
    ReaderGroup readerGroup = groupManager.createReaderGroup("reader", ReaderGroupConfig.builder().disableAutomaticCheckpoints().stream(Stream.of(SCOPE, streamName)).build());
    @Cleanup EventStreamReader<String> reader1 = clientFactory.createReader("readerId", "reader", new JavaSerializer<>(), ReaderConfig.builder().build());
    // Add segment event listener
    Listener<SegmentNotification> l1 = notification -> {
        listenerInvoked.set(true);
        numberOfReaders.set(notification.getNumOfReaders());
        numberOfSegments.set(notification.getNumOfSegments());
        listenerLatch.release();
    };
    readerGroup.getSegmentNotifier(executor).registerListener(l1);
    EventRead<String> event1 = reader1.readNextEvent(15000);
    EventRead<String> event2 = reader1.readNextEvent(15000);
    assertNotNull(event1);
    assertEquals("data1", event1.getEvent());
    assertNotNull(event2);
    assertEquals("data2", event2.getEvent());
    listenerLatch.await();
    assertTrue("Listener invoked", listenerInvoked.get());
    assertEquals(2, numberOfSegments.get());
    assertEquals(1, numberOfReaders.get());
}

Example 4 with EventStreamReader

use of io.pravega.client.stream.EventStreamReader in project pravega by pravega.

the class EndToEndAutoScaleUpWithTxnTest method main.

public static void main(String[] args) throws Exception {
    try {
        @Cleanup TestingServer zkTestServer = new TestingServerStarter().start();
        int port = Config.SERVICE_PORT;
        @Cleanup ControllerWrapper controllerWrapper = new ControllerWrapper(zkTestServer.getConnectString(), port);
        Controller controller = controllerWrapper.getController();
        controllerWrapper.getControllerService().createScope(NameUtils.INTERNAL_SCOPE_NAME).get();
        @Cleanup ConnectionFactory connectionFactory = new ConnectionFactoryImpl(ClientConfig.builder().build());
        @Cleanup ClientFactory internalCF = new ClientFactoryImpl(NameUtils.INTERNAL_SCOPE_NAME, controller, connectionFactory);
        ServiceBuilder serviceBuilder = ServiceBuilder.newInMemoryBuilder(ServiceBuilderConfig.getDefaultConfig());
        serviceBuilder.initialize();
        StreamSegmentStore store = serviceBuilder.createStreamSegmentService();
        @Cleanup SegmentStatsFactory segmentStatsFactory = new SegmentStatsFactory();
        SegmentStatsRecorder statsRecorder = segmentStatsFactory.createSegmentStatsRecorder(store, internalCF, AutoScalerConfig.builder().with(AutoScalerConfig.MUTE_IN_SECONDS, 0).with(AutoScalerConfig.COOLDOWN_IN_SECONDS, 0).build());
        @Cleanup PravegaConnectionListener server = new PravegaConnectionListener(false, "localhost", 12345, store, statsRecorder, null, null, null);
        server.startListening();
        controllerWrapper.awaitRunning();
        controllerWrapper.getControllerService().createScope("test").get();
        controller.createStream(CONFIG).get();
        @Cleanup MockClientFactory clientFactory = new MockClientFactory("test", controller);
        // Mocking pravega service by putting scale up and scale down requests for the stream
        EventWriterConfig writerConfig = EventWriterConfig.builder().transactionTimeoutTime(30000).transactionTimeoutScaleGracePeriod(30000).build();
        EventStreamWriter<String> test = clientFactory.createEventWriter("test", new JavaSerializer<>(), writerConfig);
        // region Successful commit tests
        Transaction<String> txn1 = test.beginTxn();
        txn1.writeEvent("1");
        txn1.flush();
        Map<Double, Double> map = new HashMap<>();
        map.put(0.0, 1.0 / 3.0);
        map.put(1.0 / 3.0, 2.0 / 3.0);
        map.put(2.0 / 3.0, 1.0);
        Stream stream = new StreamImpl("test", "test");
        ScheduledExecutorService executor = Executors.newSingleThreadScheduledExecutor();
        controller.scaleStream(stream, Collections.singletonList(0), map, executor).getFuture().get();
        Transaction<String> txn2 = test.beginTxn();
        txn2.writeEvent("2");
        txn2.flush();
        txn2.commit();
        txn1.commit();
        Thread.sleep(1000);
        @Cleanup ReaderGroupManager readerGroupManager = new ReaderGroupManagerImpl("test", controller, clientFactory, connectionFactory);
        readerGroupManager.createReaderGroup("readergrp", ReaderGroupConfig.builder().stream("test").build());
        final EventStreamReader<String> reader = clientFactory.createReader("1", "readergrp", new JavaSerializer<>(), ReaderConfig.builder().build());
        String event1 = reader.readNextEvent(SECONDS.toMillis(60)).getEvent();
        String event2 = reader.readNextEvent(SECONDS.toMillis(60)).getEvent();
        assert event1.equals("1");
        assert event2.equals("2");
        final AtomicBoolean done = new AtomicBoolean(false);
        startWriter(test, done);
        Retry.withExpBackoff(10, 10, 100, 10000).retryingOn(NotDoneException.class).throwingOn(RuntimeException.class).runAsync(() -> controller.getCurrentSegments("test", "test").thenAccept(streamSegments -> {
            if (streamSegments.getSegments().size() > 3) {
                System.err.println("Success");
                log.info("Success");
                System.exit(0);
            } else {
                throw new NotDoneException();
            }
        }), Executors.newSingleThreadScheduledExecutor()).exceptionally(e -> {
            System.err.println("Failure");
            log.error("Failure");
            System.exit(1);
            return null;
        }).get();
    } catch (Throwable e) {
        System.err.print("Test failed with exception: " + e.getMessage());
        log.error("Test failed with exception: {}", e);
        System.exit(-1);
    }
    System.exit(0);
}

Example 5 with EventStreamReader

use of io.pravega.client.stream.EventStreamReader in project pravega by pravega.

the class MultiReadersEndToEndTest method readAllEvents.

private Collection<Integer> readAllEvents(final int numParallelReaders, ClientFactory clientFactory, final String readerGroupName, final int numSegments) {
    ConcurrentLinkedQueue<Integer> read = new ConcurrentLinkedQueue<>();
    final ExecutorService executorService = Executors.newFixedThreadPool(numParallelReaders, new ThreadFactoryBuilder().setNameFormat("testreader-pool-%d").build());
    List<Future<?>> futures = new ArrayList<>();
    for (int i = 0; i < numParallelReaders; i++) {
        futures.add(executorService.submit(() -> {
            final String readerId = UUID.randomUUID().toString();
            @Cleanup final EventStreamReader<Integer> reader = clientFactory.createReader(readerId, readerGroupName, new IntegerSerializer(), ReaderConfig.builder().build());
            int emptyCount = 0;
            while (emptyCount <= numSegments) {
                try {
                    final Integer integerEventRead = reader.readNextEvent(100).getEvent();
                    if (integerEventRead != null) {
                        read.add(integerEventRead);
                        emptyCount = 0;
                    } else {
                        emptyCount++;
                    }
                } catch (ReinitializationRequiredException e) {
                    throw new RuntimeException(e);
                }
            }
        }));
    }
    // Wait until all readers are done.
    futures.forEach(f -> Futures.getAndHandleExceptions(f, RuntimeException::new));
    executorService.shutdownNow();
    return read;
}