public void Start()
{
while (!_stop)
{
try
{
if (_partitionsNeedingLeader.IsEmpty)
{
Thread.Sleep(_config.ConsumeGroupFindNewLeaderSleepIntervalMs);
continue;
}
PartitionTopicInfo partition;
if (_partitionsNeedingLeader.TryDequeue(out partition))
{
Logger.DebugFormat("Finding new leader for topic {0}, partition {1}", partition.Topic, partition.PartitionId);
Broker newLeader = null;
foreach (KeyValuePair<int, Broker> broker in _brokers.Brokers)
{
var consumer = new Consumer(_config, broker.Value.Host, broker.Value.Port);
try
{
IEnumerable<TopicMetadata> metaData = consumer.GetMetaData(TopicMetadataRequest.Create(new[] { partition.Topic }, 1, 0, clientId));
if (metaData != null && metaData.Any())
{
PartitionMetadata newPartitionData = metaData.First().PartitionsMetadata.FirstOrDefault(p => p.PartitionId == partition.PartitionId);
if (newPartitionData != null)
{
Logger.DebugFormat("New leader for {0} ({1}) is broker {2}", partition.Topic, partition.PartitionId, newPartitionData.Leader.Id);
newLeader = newPartitionData.Leader;
break;
}
}
}
catch (Exception ex)
{
Logger.WarnFormat("Error retrieving meta data from broker {0}: {1}", broker.Value.Id, ex.FormatException());
}
}
if (newLeader == null)
{
Logger.ErrorFormat("New leader information could not be retrieved for {0} ({1})", partition.Topic, partition.PartitionId);
}
else
{
_createNewFetcher(partition, newLeader);
}
}
}
catch (Exception ex)
{
Logger.ErrorFormat("PartitionLeaderFinder encountered an error: {0}", ex.FormatException());
Thread.Sleep(FailureRetryDelayMs);
}
}
Logger.Info("Partition leader finder thread shutting down.");
}
/// <summary>
/// Retrive first or last offset for a given partition.
/// </summary>
/// <remarks>
/// If <see cref="offsetRequestConstant"/> not equal to <see cref="OffsetRequest.LatestTime"/> or <see cref="OffsetRequest.EarliestTime"/> method returns offset before specified number.
/// </remarks>
/// <param name="consumer">Consumer instance</param>
/// <param name="topic">The topic</param>
/// <param name="partitionId">Partition Id</param>
/// <param name="offsetRequestConstant">Offset that indicates what offset need to return.</param>
/// <returns>
/// Retrive first or last offset for a given partition based on <see cref="offsetRequestConstant"/> parameter.
/// If offset couldn't be retrieved returns null.
/// </returns>
public static long? EarliestOrLatestOffset(Consumer consumer, string topic, int partitionId, long offsetRequestConstant)
{
var requestInfos = new Dictionary<string, List<PartitionOffsetRequestInfo>>();
requestInfos[topic] = new List<PartitionOffsetRequestInfo>() { new PartitionOffsetRequestInfo(partitionId, offsetRequestConstant, 1) };
var offsets = consumer.GetOffsetsBefore(new OffsetRequest(requestInfos));
var topicResult = offsets.ResponseMap[topic];
var responseRow = topicResult != null ? topicResult.FirstOrDefault() : null;
return responseRow != null && responseRow.Offsets != null && responseRow.Offsets.Count > 0 ? responseRow.Offsets[0] : (long?)null;
}
public void AsyncProducerSendsAndConsumerReceivesSingleSimpleMessage()
{
var prodConfig = this.AsyncProducerConfig1;
var consumerConfig = this.ConsumerConfig1;
var sourceMessage = new Message(Encoding.UTF8.GetBytes("test message"));
using (var producer = new AsyncProducer(prodConfig))
{
var producerRequest = new ProducerRequest(CurrentTestTopic, 0, new List<Message> { sourceMessage });
producer.Send(producerRequest);
}
long currentOffset = TestHelper.GetCurrentKafkaOffset(CurrentTestTopic, consumerConfig);
IConsumer consumer = new Consumer(consumerConfig);
var request = new FetchRequest(CurrentTestTopic, 0, currentOffset);
BufferedMessageSet response;
int totalWaitTimeInMiliseconds = 0;
int waitSingle = 100;
while (true)
{
Thread.Sleep(waitSingle);
response = consumer.Fetch(request);
if (response != null && response.Messages.Count() > 0)
{
break;
}
totalWaitTimeInMiliseconds += waitSingle;
if (totalWaitTimeInMiliseconds >= MaxTestWaitTimeInMiliseconds)
{
break;
}
}
Assert.NotNull(response);
Assert.AreEqual(1, response.Messages.Count());
Message resultMessage = response.Messages.First();
Assert.AreEqual(sourceMessage.ToString(), resultMessage.ToString());
}
public void ConsumerFetchMessage()
{
ProducerSendsMessage();
ConsumerConfig config = new ConsumerConfig(clientConfig);
IConsumer consumer = new Kafka.Client.Consumers.Consumer(config);
FetchRequest request = new FetchRequest(CurrentTestTopic, 0, 0);
BufferedMessageSet response = consumer.Fetch(request);
Assert.NotNull(response);
foreach (var message in response.Messages)
{
Console.WriteLine(message);
}
}
public void ProducerSendsAndConsumerReceivesMultiRequest()
{
var prodConfig = this.SyncProducerConfig1;
var consumerConfig = this.ConsumerConfig1;
string testTopic1 = CurrentTestTopic + "1";
string testTopic2 = CurrentTestTopic + "2";
string testTopic3 = CurrentTestTopic + "3";
var sourceMessage1 = new Message(Encoding.UTF8.GetBytes("1: TestMessage"));
var sourceMessage2 = new Message(Encoding.UTF8.GetBytes("2: TestMessage"));
var sourceMessage3 = new Message(Encoding.UTF8.GetBytes("3: TestMessage"));
var sourceMessage4 = new Message(Encoding.UTF8.GetBytes("4: TestMessage"));
var 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 })
};
long currentOffset1 = TestHelper.GetCurrentKafkaOffset(testTopic1, consumerConfig);
long currentOffset2 = TestHelper.GetCurrentKafkaOffset(testTopic2, consumerConfig);
long currentOffset3 = TestHelper.GetCurrentKafkaOffset(testTopic3, consumerConfig);
using (var producer = new SyncProducer(prodConfig))
{
producer.MultiSend(requests);
}
IConsumer consumer = new Consumer(consumerConfig);
var 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;
}
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()
{
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());
}
}
}
public void ConsumerGetsOffsets()
{
var consumerConfig = this.ConsumerConfig1;
var request = new OffsetRequest(CurrentTestTopic, 0, DateTime.Now.AddHours(-24).Ticks, 10);
IConsumer consumer = new Consumer(consumerConfig);
IList<long> list = consumer.GetOffsetsBefore(request);
foreach (long l in list)
{
Console.Out.WriteLine(l);
}
}
public void ConsumerFetchMessage()
{
var consumerConfig = this.ConsumerConfig1;
ProducerSendsMessage();
Thread.Sleep(1000);
IConsumer consumer = new Consumer(consumerConfig);
var request = new FetchRequest(CurrentTestTopic, 0, 0);
BufferedMessageSet response = consumer.Fetch(request);
Assert.NotNull(response);
int count = 0;
foreach (var message in response)
{
count++;
Console.WriteLine(message.Message);
}
Assert.AreEqual(2, count);
}