Examples of org.apache.flume.Transaction.begin()

org.apache.flume.Transaction.begin()

Starts a transaction boundary for the current channel operation. If a transaction is already in progress, this method will join that transaction using reference counting.

Note: For every invocation of this method there must be a corresponding invocation of {@linkplain #close()} method. Failureto ensure this can lead to dangling transactions and unpredictable results.

          Thread.sleep(1000);
          barrier.await();
          while (counter.get() < (total - rolledBackCount.get())) {
            if (tx == null) {
              tx = channel.getTransaction();
              tx.begin();
            }
            try {
              Event e = channel.take();
              if (e != null) {
                startedGettingEvents.set(true);

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    source.start();
    while (source.getSourceCounter().getEventAcceptedCount() < 8) {
      Thread.sleep(10);
    }
    Transaction txn = channel.getTransaction();
    txn.begin();
    Event e = channel.take();
    Assert.assertNotNull("Event must not be null", e);
    Assert.assertNotNull("Event headers must not be null", e.getHeaders());
    Assert.assertNotNull(e.getHeaders().get("fileHeaderKeyTest"));
    Assert.assertEquals(f1.getAbsolutePath(),

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    source.start();
    while (source.getSourceCounter().getEventAcceptedCount() < 8) {
      Thread.sleep(10);
    }
    Transaction txn = channel.getTransaction();
    txn.begin();
    Event e = channel.take();
    Assert.assertNotNull("Event must not be null", e);
    Assert.assertNotNull("Event headers must not be null", e.getHeaders());
    Assert.assertNotNull(e.getHeaders().get("basenameHeaderKeyTest"));
    Assert.assertEquals(f1.getName(),

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          tmpDir.getAbsolutePath());
      Configurables.configure(source, context);
      source.start();
      Thread.sleep(TimeUnit.SECONDS.toMillis(1));
      Transaction txn = channel.getTransaction();
      txn.begin();
      try {
        Event event = channel.take();
        String content = new String(event.getBody(), Charsets.UTF_8);
        Assert.assertEquals("File " + i, content);
        txn.commit();

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    List<String> dataOut = Lists.newArrayList();


    for (int i = 0; i < 8; ) {
      Transaction tx = channel.getTransaction();
      tx.begin();
      Event e = channel.take();
      if (e != null) {
        dataOut.add(new String(e.getBody(), "UTF-8"));
        i++;
      }

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    Transaction transaction = null;
    try {
      long processedEvents = 0;


      transaction = channel.getTransaction();
      transaction.begin();
      for (; processedEvents < batchSize; processedEvents += 1) {
        Event event = channel.take();
        if (event == null) {
          // no events available in the channel
          break;

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    }


    sink.stop();


    Transaction sourceTransaction = sourceChannel.getTransaction();
    sourceTransaction.begin();


    Event sourceEvent = sourceChannel.take();
    Assert.assertNotNull(sourceEvent);
    Assert.assertEquals("Channel contained our event", "Hello avro",
        new String(sourceEvent.getBody()));

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    Assert.assertTrue(LifecycleController.waitForOneOf(sink,
        LifecycleState.START_OR_ERROR, 5000));


    Transaction transaction = channel.getTransaction();


    transaction.begin();
    for (int i = 0; i < 10; i++) {
      channel.put(event);
    }
    transaction.commit();
    transaction.close();

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    Assert.assertTrue(LifecycleController.waitForOneOf(sink,
        LifecycleState.START_OR_ERROR, 5000));


    Transaction transaction = channel.getTransaction();


    transaction.begin();
    for (int i = 0; i < 10; i++) {
      channel.put(event);
    }
    transaction.commit();
    transaction.close();

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    sink.start();


    Transaction sickTransaction = channel.getTransaction();


    sickTransaction.begin();
    for (int i = 0; i < 10; i++) {
      channel.put(event);
    }
    sickTransaction.commit();
    sickTransaction.close();

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