[英]Kafka consumer is not consuming message
我是卡夫卡的新手。 kafka 消費者沒有從給定主題讀取消息。 我也在檢查 kafka 控制台。 它不工作。 我不明白這個問題。 它早些時候工作正常。
public string MessageConsumer(string brokerList, List<string> topics, CancellationToken cancellationToken)
{
//ConfigurationManager.AutoLoadAppSettings("", "", true);
string logKey = string.Format("ARIConsumer.StartPRoducer ==>Topics {0} Key{1} =>", "", string.Join(",", topics));
string message = string.Empty;
var conf = new ConsumerConfig
{
BootstrapServers = "localhost:9092",
GroupId = "23",
EnableAutoCommit = false,
AutoOffsetReset = AutoOffsetResetType.Latest,
};
using (var c = new Consumer<Ignore, string>(conf))
{
try
{
c.Subscribe(topics);
bool consuming = true;
// The client will automatically recover from non-fatal errors. You typically
// don't need to take any action unless an error is marked as fatal.
c.OnError += (_, e) => consuming = !e.IsFatal;
while (consuming)
{
try
{
TimeSpan timeSpan = new TimeSpan(0, 0, 5);
var cr = c.Consume(timeSpan);
// Thread.Sleep(5000);
if (cr != null)
{
message = cr.Value;
Console.WriteLine("Thread" + Thread.CurrentThread.ManagedThreadId + "Message : " + message);
CLogger.WriteLog(ELogLevel.INFO, $"Consumed message Partition '{cr.Partition}' at: '{cr.TopicPartitionOffset} thread: { Thread.CurrentThread.ManagedThreadId}'. Message: {message}");
//Console.WriteLine($"Consumed message Partition '{cr.Partition}' at: '{cr.TopicPartitionOffset}'. Topic: { cr.Topic} value :{cr.Value} Timestamp :{DateTime.UtcNow.ToString("yyyy-MM-dd HH:mm:ss.fff", CultureInfo.InvariantCulture)} GrpId: { conf.GroupId}");
c.Commit();
}
Console.WriteLine($"Calling the next Poll ");
}
catch (ConsumeException e)
{
CLogger.WriteLog(ELogLevel.ERROR, $"Error occured: {e.Error.Reason}");
Console.WriteLine($"Error occured: {e.Error.Reason}");
}
//consuming = false;
}
// Ensure the consumer leaves the group cleanly and final offsets are committed.
c.Close();
}
catch (Exception ex)
{
}
}
return message;
}
此代碼有什么問題,或者 kafka 存在安裝問題
是否有生產者主動發送數據?
您的消費者從基於 AutoOffsetReset 的最新偏移量開始,因此它不會讀取主題中的現有數據
控制台消費者也默認使用最新的偏移量
如果您沒有更改 GroupId,那么您的消費者可能已經工作過一次,然后您消費了數據,然后提交了該組的偏移量。 當consumer在同一個組中再次啟動時,只會從topic的末尾,或者最后一次commit的offset處恢復
您還有一個空的catch (Exception ex)
,它可能隱藏了一些其他錯誤
嘗試從消費方法中刪除時間跨度。
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