public void GetBytesValidFormat()
{
List<FetchRequest> requests = new List<FetchRequest>
{
new FetchRequest("topic a", 0, 0),
new FetchRequest("topic a", 0, 0),
new FetchRequest("topic b", 0, 0),
new FetchRequest("topic c", 0, 0)
};
MultiFetchRequest request = new MultiFetchRequest(requests);
// format = len(request) + requesttype + requestcount + requestpackage
// total byte count = 4 + (2 + 2 + 100)
MemoryStream ms = new MemoryStream();
request.WriteTo(ms);
byte[] bytes = ms.ToArray();
Assert.IsNotNull(bytes);
Assert.AreEqual(108, bytes.Length);
// first 4 bytes = the length of the request
Assert.AreEqual(104, BitConverter.ToInt32(BitWorks.ReverseBytes(bytes.Take(4).ToArray<byte>()), 0));
// next 2 bytes = the RequestType which in this case should be Produce
Assert.AreEqual((short)RequestTypes.MultiFetch, BitConverter.ToInt16(BitWorks.ReverseBytes(bytes.Skip(4).Take(2).ToArray<byte>()), 0));
// next 2 bytes = the number of messages
Assert.AreEqual((short)4, BitConverter.ToInt16(BitWorks.ReverseBytes(bytes.Skip(6).Take(2).ToArray<byte>()), 0));
}
private static void MultiFetch(KafkaConnection conn, MultiFetchRequest request, IList<BufferedMessageSet> result)
{
result.Clear();
conn.Write(request);
int dataLength = BitConverter.ToInt32(BitWorks.ReverseBytes(conn.Read(4)), 0);
if (dataLength <= 0)
{
return;
}
byte[] data = conn.Read(dataLength);
int errorCode = BitConverter.ToInt16(BitWorks.ReverseBytes(data.Take(2).ToArray()), 0);
if (errorCode != KafkaException.NoError)
{
throw new KafkaException(errorCode);
}
// skip the error code
byte[] unbufferedData = data.Skip(2).ToArray();
for (int i = 0; i < request.ConsumerRequests.Count; i++)
{
int partLength = BitConverter.ToInt32(BitWorks.ReverseBytes(unbufferedData.Take(4).ToArray()), 0);
errorCode = BitConverter.ToInt16(BitWorks.ReverseBytes(unbufferedData.Skip(4).Take(2).ToArray()), 0);
if (errorCode != KafkaException.NoError)
{
throw new KafkaException(errorCode);
}
result.Add(BufferedMessageSet.ParseFrom(unbufferedData.Skip(6).Take(partLength - 2).ToArray()));
unbufferedData = unbufferedData.Skip(partLength + 4).ToArray();
}
}
/// <summary>
/// Combine multiple fetch requests in one call.
/// </summary>
/// <param name="request">
/// The list of fetch requests.
/// </param>
/// <returns>
/// A list of sets of fetched messages.
/// </returns>
/// <remarks>
/// Offset is passed in on every request, allowing the user to maintain this metadata
/// however they choose.
/// </remarks>
public IList<BufferedMessageSet> MultiFetch(MultiFetchRequest request)
{
var result = new List<BufferedMessageSet>();
using (var conn = new KafkaConnection(this.Host, this.Port))
{
short tryCounter = 1;
bool success = false;
while (!success && tryCounter <= this.config.NumberOfTries)
{
try
{
MultiFetch(conn, request, result);
success = true;
}
catch (Exception ex)
{
// if maximum number of tries reached
if (tryCounter == this.config.NumberOfTries)
{
throw;
}
tryCounter++;
Logger.InfoFormat(CultureInfo.CurrentCulture, "MultiFetch reconnect due to {0}", ex);
}
}
}
return result;
}
/// <summary>
/// Writes a multifetch request to the server.
/// </summary>
/// <remarks>
/// Write timeout is defaulted to infitite.
/// </remarks>
/// <param name="request">The <see cref="MultiFetchRequest"/> to send to the server.</param>
public void Write(MultiFetchRequest request)
{
this.EnsuresNotDisposed();
Guard.NotNull(request, "request");
this.Write(request.RequestBuffer.GetBuffer());
}
/// <summary>
/// Method to be used for starting a new thread
/// </summary>
internal void Run()
{
foreach (var partitionTopicInfo in partitionTopicInfos)
{
Logger.InfoFormat(
CultureInfo.CurrentCulture,
"{0} start fetching topic: {1} part: {2} offset: {3} from {4}:{5}",
this.name,
partitionTopicInfo.Topic,
partitionTopicInfo.Partition.PartId,
partitionTopicInfo.GetFetchOffset(),
this.broker.Host,
this.broker.Port);
}
try
{
while (!this.shouldStop)
{
var requestList = new List<FetchRequest>();
foreach (var partitionTopicInfo in this.partitionTopicInfos)
{
var singleRequest = new FetchRequest(partitionTopicInfo.Topic, partitionTopicInfo.Partition.PartId, partitionTopicInfo.GetFetchOffset(), this.config.MaxFetchSize);
requestList.Add(singleRequest);
}
Logger.Debug("Fetch request: " + string.Join(", ", requestList.Select(x => x.ToString())));
var request = new MultiFetchRequest(requestList);
var response = this.simpleConsumer.MultiFetch(request);
int read = 0;
var items = this.partitionTopicInfos.Zip(
response,
(x, y) =>
new Tuple<PartitionTopicInfo, BufferedMessageSet>(x, y));
foreach (Tuple<PartitionTopicInfo, BufferedMessageSet> item in items)
{
BufferedMessageSet messages = item.Item2;
PartitionTopicInfo info = item.Item1;
try
{
bool done = false;
if (messages.ErrorCode == ErrorMapping.OffsetOutOfRangeCode)
{
Logger.InfoFormat(CultureInfo.CurrentCulture, "offset {0} out of range", info.GetFetchOffset());
//// see if we can fix this error
var resetOffset = this.ResetConsumerOffsets(info.Topic, info.Partition);
if (resetOffset >= 0)
{
info.ResetFetchOffset(resetOffset);
info.ResetConsumeOffset(resetOffset);
done = true;
}
}
if (!done)
{
read += info.Add(messages, info.GetFetchOffset());
}
}
catch (Exception ex)
{
if (!shouldStop)
{
Logger.ErrorFormat(CultureInfo.CurrentCulture, "error in FetcherRunnable for {0}" + info, ex);
}
throw;
}
}
Logger.Info("Fetched bytes: " + read);
if (read == 0)
{
Logger.DebugFormat(CultureInfo.CurrentCulture, "backing off {0} ms", this.config.BackOffIncrement);
Thread.Sleep(this.config.BackOffIncrement);
}
}
}
catch (Exception ex)
{
if (shouldStop)
{
Logger.InfoFormat(CultureInfo.CurrentCulture, "FetcherRunnable {0} interrupted", this);
}
else
{
Logger.ErrorFormat(CultureInfo.CurrentCulture, "error in FetcherRunnable {0}", ex);
}
}
Logger.InfoFormat(CultureInfo.CurrentCulture, "stopping fetcher {0} to host {1}", this.name, this.broker.Host);
}
public void ProducerSendsAndConsumerReceivesMultiRequest()
{
string testTopic1 = CurrentTestTopic + "1";
string testTopic2 = CurrentTestTopic + "2";
string testTopic3 = CurrentTestTopic + "3";
Message sourceMessage1 = new Message(Encoding.UTF8.GetBytes("1: TestMessage"));
Message sourceMessage2 = new Message(Encoding.UTF8.GetBytes("2: TestMessage"));
Message sourceMessage3 = new Message(Encoding.UTF8.GetBytes("3: TestMessage"));
Message sourceMessage4 = new Message(Encoding.UTF8.GetBytes("4: TestMessage"));
List<ProducerRequest> requests = new List<ProducerRequest>
{
new ProducerRequest(testTopic1, 0, new List<Message> { sourceMessage1 }),
new ProducerRequest(testTopic1, 0, new List<Message> { sourceMessage2 }),
new ProducerRequest(testTopic2, 0, new List<Message> { sourceMessage3 }),
new ProducerRequest(testTopic3, 0, new List<Message> { sourceMessage4 })
};
var config = new SyncProducerConfig(clientConfig);
var producer = new SyncProducer(config);
long currentOffset1 = TestHelper.GetCurrentKafkaOffset(testTopic1, clientConfig);
long currentOffset2 = TestHelper.GetCurrentKafkaOffset(testTopic2, clientConfig);
long currentOffset3 = TestHelper.GetCurrentKafkaOffset(testTopic3, clientConfig);
producer.MultiSend(requests);
ConsumerConfig consumerConfig = new ConsumerConfig(clientConfig);
IConsumer consumer = new Consumers.Consumer(consumerConfig);
MultiFetchRequest request = new MultiFetchRequest(new List<FetchRequest>
{
new FetchRequest(testTopic1, 0, currentOffset1),
new FetchRequest(testTopic2, 0, currentOffset2),
new FetchRequest(testTopic3, 0, currentOffset3)
});
IList<BufferedMessageSet> messageSets;
int totalWaitTimeInMiliseconds = 0;
int waitSingle = 100;
while (true)
{
Thread.Sleep(waitSingle);
messageSets = consumer.MultiFetch(request);
if (messageSets.Count > 2 && messageSets[0].Messages.Count() > 0 && messageSets[1].Messages.Count() > 0 && messageSets[2].Messages.Count() > 0)
{
break;
}
else
{
totalWaitTimeInMiliseconds += waitSingle;
if (totalWaitTimeInMiliseconds >= MaxTestWaitTimeInMiliseconds)
{
break;
}
}
}
Assert.AreEqual(3, messageSets.Count);
Assert.AreEqual(2, messageSets[0].Messages.Count());
Assert.AreEqual(1, messageSets[1].Messages.Count());
Assert.AreEqual(1, messageSets[2].Messages.Count());
Assert.AreEqual(sourceMessage1.ToString(), messageSets[0].Messages.First().ToString());
Assert.AreEqual(sourceMessage2.ToString(), messageSets[0].Messages.Skip(1).First().ToString());
Assert.AreEqual(sourceMessage3.ToString(), messageSets[1].Messages.First().ToString());
Assert.AreEqual(sourceMessage4.ToString(), messageSets[2].Messages.First().ToString());
}
public void ConsumerMultiFetchGetsMessage()
{
ProducerSendMultiRequest();
ConsumerConfig config = new ConsumerConfig(clientConfig);
IConsumer cons = new Consumers.Consumer(config);
MultiFetchRequest request = new MultiFetchRequest(new List<FetchRequest>
{
new FetchRequest(CurrentTestTopic, 0, 0),
new FetchRequest(CurrentTestTopic, 0, 0),
new FetchRequest(CurrentTestTopic + "2", 0, 0)
});
IList<BufferedMessageSet> response = cons.MultiFetch(request);
for (int ix = 0; ix < response.Count; ix++)
{
IEnumerable<Message> messageSet = response[ix].Messages;
Console.WriteLine(string.Format("Request #{0}-->", ix));
foreach (Message msg in messageSet)
{
Console.WriteLine(msg);
}
}
}
public void ThrowsExceptionWhenNullArgumentPassedToTheConstructor()
{
MultiFetchRequest multiRequest;
Assert.Throws<ArgumentNullException>(() => multiRequest = new MultiFetchRequest(null));
}
public void ConsumerMultiFetchGetsMessage()
{
var config = this.ConsumerConfig1;
ProducerSendMultiRequest();
Thread.Sleep(2000);
IConsumer cons = new Consumer(config);
var request = new MultiFetchRequest(new List<FetchRequest>
{
new FetchRequest(CurrentTestTopic, 0, 0),
new FetchRequest(CurrentTestTopic, 0, 0),
new FetchRequest(CurrentTestTopic, 0, 0)
});
IList<BufferedMessageSet> response = cons.MultiFetch(request);
Assert.AreEqual(3, response.Count);
for (int ix = 0; ix < response.Count; ix++)
{
IEnumerable<Message> messageSet = response[ix].Messages;
Assert.AreEqual(4, messageSet.Count());
Console.WriteLine(string.Format("Request #{0}-->", ix));
foreach (Message msg in messageSet)
{
Console.WriteLine(msg.ToString());
}
}
}
/// <summary>
/// Combine multiple fetch requests in one call.
/// </summary>
/// <param name="request">
/// The list of fetch requests.
/// </param>
/// <returns>
/// A list of sets of fetched messages.
/// </returns>
/// <remarks>
/// Offset is passed in on every request, allowing the user to maintain this metadata
/// however they choose.
/// </remarks>
public IList<BufferedMessageSet> MultiFetch(MultiFetchRequest request)
{
var result = new List<BufferedMessageSet>();
short tryCounter = 1;
while (tryCounter <= this.config.NumberOfTries)
{
try
{
using (var conn = new KafkaConnection(
this.host,
this.port,
this.config.BufferSize,
this.config.SocketTimeout))
{
conn.Write(request);
int size = conn.Reader.ReadInt32();
return BufferedMessageSet.ParseMultiFrom(conn.Reader, size, request.ConsumerRequests.Count);
}
}
catch (Exception ex)
{
// if maximum number of tries reached
if (tryCounter == this.config.NumberOfTries)
{
throw;
}
tryCounter++;
Logger.InfoFormat(CultureInfo.CurrentCulture, "MultiFetch reconnect due to {0}", ex);
}
}
return result;
}
/// <summary>
/// Writes a multifetch request to the server.
/// </summary>
/// <remarks>
/// Write timeout is defaulted to infitite.
/// </remarks>
/// <param name="request">The <see cref="MultiFetchRequest"/> to send to the server.</param>
public void Write(MultiFetchRequest request)
{
this.EnsuresNotDisposed();
Guard.Assert<ArgumentNullException>(() => request != null);
this.Write(request.RequestBuffer.GetBuffer(), Timeout.Infinite);
}
