立即构建 Kafka 生产者会导致 "Disconnected while requesting ApiVersion" 错误

Question

我下载了 kafka_2.13-2.5.1，将其解压缩到一个文件夹中，编辑了 producer.properties，以启用 Snappy 压缩，并保留了其余的香草。我用命令

启动任何它（服务器？集群？他妈的知道）

bin/windows/zookeeper-server-start.bat config/zookeeper.properties

启动并显示正在监听2181端口：

INFO binding to port 0.0.0.0/0.0.0.0:2181 (org.apache.zookeeper.server.NIOServerCnxnFactory)

在我的 C# 代码中，我创建了一个错误处理程序：

void KafkaErrorHandler(IProducer<Null, string> producer, Error error)
{
    Console.WriteLine(error.Reason);
}

那我正在尝试建立一个生产者：

kafkaProducerConfig = new ProducerConfig
{
    CompressionType = CompressionType.Snappy,
    BootstrapServers = "localhost:2181", // Docs said 9092 plain, 9093 SSL. Huh?
    ClientId = Dns.GetHostEntry(Environment.MachineName).HostName
};

var pb = new ProducerBuilder<Null, string>(kafkaProducerConfig);
pb.SetErrorHandler(KafkaErrorHandler);
kafkaProducer = pb.Build();

代码一到最后一行，即刻进入错误处理程序，Error对象显示为：

{localhost:2181/bootstrap: Disconnected while requesting ApiVersion: might be caused by incorrect security.protocol configuration (connecting to a SSL listener?) or broker version is < 0.10 (see api.version.request) (after 1ms in state APIVERSION_QUERY)}

Kafka 控制台 window 立即开始发出无尽的警告，直到我终止应用程序：

[2020-12-01 15:53:39,486] WARN Exception causing close of session 0x0: Unreasonable length = 1718383973 (org.apache.zookeeper.server.NIOServerCnxn)
[2020-12-01 15:53:39,781] WARN Exception causing close of session 0x0: Unreasonable length = 1718383973 (org.apache.zookeeper.server.NIOServerCnxn)
[2020-12-01 15:53:40,093] WARN Exception causing close of session 0x0: Unreasonable length = 1718383973 (org.apache.zookeeper.server.NIOServerCnxn)
[2020-12-01 15:53:41,409] WARN Exception causing close of session 0x0: Unreasonable length = 1718383973 (org.apache.zookeeper.server.NIOServerCnxn)
[2020-12-01 15:53:45,683] WARN Exception causing close of session 0x0: Unreasonable length = 1718383973 (org.apache.zookeeper.server.NIOServerCnxn)
[2020-12-01 15:53:55,686] WARN Exception causing close of session 0x0: Unreasonable length = 1718383973 (org.apache.zookeeper.server.NIOServerCnxn)
[2020-12-01 15:54:05,688] WARN Exception causing close of session 0x0: Unreasonable length = 1718383973 (org.apache.zookeeper.server.NIOServerCnxn)
[2020-12-01 15:54:13,683] WARN Exception causing close of session 0x0: Unreasonable length = 1718383973 (org.apache.zookeeper.server.NIOServerCnxn)
[2020-12-01 15:54:23,682] WARN Exception causing close of session 0x0: Unreasonable length = 1718383973 (org.apache.zookeeper.server.NIOServerCnxn)
[2020-12-01 15:54:33,573] WARN Exception causing close of session 0x0: Unreasonable length = 1718383973 (org.apache.zookeeper.server.NIOServerCnxn)
[2020-12-01 15:54:43,579] WARN Exception causing close of session 0x0: Unreasonable length = 1718383973 (org.apache.zookeeper.server.NIOServerCnxn)
[2020-12-01 15:54:53,583] WARN Exception causing close of session 0x0: Unreasonable length = 1718383973 (org.apache.zookeeper.server.NIOServerCnxn)
[2020-12-01 15:55:03,499] WARN Exception causing close of session 0x0: Unreasonable length = 1718383973 (org.apache.zookeeper.server.NIOServerCnxn)
[2020-12-01 15:55:13,504] WARN Exception causing close of session 0x0: Unreasonable length = 1718383973 (org.apache.zookeeper.server.NIOServerCnxn)
[2020-12-01 15:55:23,501] WARN Exception causing close of session 0x0: Unreasonable length = 1718383973 (org.apache.zookeeper.server.NIOServerCnxn)
[2020-12-01 15:55:33,505] WARN Exception causing close of session 0x0: Unreasonable length = 1718383973 (org.apache.zookeeper.server.NIOServerCnxn)
[2020-12-01 15:56:17,879] WARN Exception causing close of session 0x0: Unreasonable length = 1718383973 (org.apache.zookeeper.server.NIOServerCnxn)
[2020-12-01 15:56:18,175] WARN Exception causing close of session 0x0: Unreasonable length = 1718383973 (org.apache.zookeeper.server.NIOServerCnxn)
[2020-12-01 15:56:18,494] WARN Exception causing close of session 0x0: Unreasonable length = 1718383973 (org.apache.zookeeper.server.NIOServerCnxn)
[2020-12-01 15:56:19,809] WARN Exception causing close of session 0x0: Unreasonable length = 1718383973 (org.apache.zookeeper.server.NIOServerCnxn)
[2020-12-01 15:56:24,083] WARN Exception causing close of session 0x0: Unreasonable length = 1718383973 (org.apache.zookeeper.server.NIOServerCnxn)
[2020-12-01 15:56:34,087] WARN Exception causing close of session 0x0: Unreasonable length = 1718383973 (org.apache.zookeeper.server.NIOServerCnxn)
[2020-12-01 15:56:44,087] WARN Exception causing close of session 0x0: Unreasonable length = 1718383973 (org.apache.zookeeper.server.NIOServerCnxn)
[2020-12-01 15:56:52,080] WARN Exception causing close of session 0x0: Unreasonable length = 1718383973 (org.apache.zookeeper.server.NIOServerCnxn)
[2020-12-01 15:57:02,079] WARN Exception causing close of session 0x0: Unreasonable length = 1718383973 (org.apache.zookeeper.server.NIOServerCnxn)
[2020-12-01 15:57:11,968] WARN Exception causing close of session 0x0: Unreasonable length = 1718383973 (org.apache.zookeeper.server.NIOServerCnxn)
[2020-12-01 15:57:59,379] WARN Exception causing close of session 0x0: Unreasonable length = 1718383973 (org.apache.zookeeper.server.NIOServerCnxn)
[2020-12-01 15:57:59,675] WARN Exception causing close of session 0x0: Unreasonable length = 1718383973 (org.apache.zookeeper.server.NIOServerCnxn)
[2020-12-01 15:57:59,986] WARN Exception causing close of session 0x0: Unreasonable length = 1718383973 (org.apache.zookeeper.server.NIOServerCnxn)
[2020-12-01 15:58:01,302] WARN Exception causing close of session 0x0: Unreasonable length = 1718383973 (org.apache.zookeeper.server.NIOServerCnxn)
[2020-12-01 15:58:05,575] WARN Exception causing close of session 0x0: Unreasonable length = 1718383973 (org.apache.zookeeper.server.NIOServerCnxn)
[2020-12-01 15:58:15,580] WARN Exception causing close of session 0x0: Unreasonable length = 1718383973 (org.apache.zookeeper.server.NIOServerCnxn)
[2020-12-01 15:58:25,579] WARN Exception causing close of session 0x0: Unreasonable length = 1718383973 (org.apache.zookeeper.server.NIOServerCnxn)
[2020-12-01 15:58:33,575] WARN Exception causing close of session 0x0: Unreasonable length = 1718383973 (org.apache.zookeeper.server.NIOServerCnxn)
[2020-12-01 15:58:43,575] WARN Exception causing close of session 0x0: Unreasonable length = 1718383973 (org.apache.zookeeper.server.NIOServerCnxn)
[2020-12-01 15:58:53,465] WARN Exception causing close of session 0x0: Unreasonable length = 1718383973 (org.apache.zookeeper.server.NIOServerCnxn)
[2020-12-01 15:59:03,465] WARN Exception causing close of session 0x0: Unreasonable length = 1718383973 (org.apache.zookeeper.server.NIOServerCnxn)
[2020-12-01 15:59:13,468] WARN Exception causing close of session 0x0: Unreasonable length = 1718383973 (org.apache.zookeeper.server.NIOServerCnxn)
[2020-12-01 15:59:23,384] WARN Exception causing close of session 0x0: Unreasonable length = 1718383973 (org.apache.zookeeper.server.NIOServerCnxn)
[2020-12-01 15:59:33,387] WARN Exception causing close of session 0x0: Unreasonable length = 1718383973 (org.apache.zookeeper.server.NIOServerCnxn)
[2020-12-01 15:59:43,387] WARN Exception causing close of session 0x0: Unreasonable length = 1718383973 (org.apache.zookeeper.server.NIOServerCnxn)
[2020-12-01 15:59:53,393] WARN Exception causing close of session 0x0: Unreasonable length = 1718383973 (org.apache.zookeeper.server.NIOServerCnxn)
[2020-12-01 16:00:03,391] WARN Exception causing close of session 0x0: Unreasonable length = 1718383973 (org.apache.zookeeper.server.NIOServerCnxn)
[2020-12-01 16:00:13,399] WARN Exception causing close of session 0x0: Unreasonable length = 1718383973 (org.apache.zookeeper.server.NIOServerCnxn)
[2020-12-01 16:00:22,206] WARN Exception causing close of session 0x0: Unreasonable length = 1718383973 (org.apache.zookeeper.server.NIOServerCnxn)
[2020-12-01 16:00:32,210] WARN Exception causing close of session 0x0: Unreasonable length = 1718383973 (org.apache.zookeeper.server.NIOServerCnxn)
[2020-12-01 16:00:39,848] WARN Exception causing close of session 0x0: Unreasonable length = 1718383973 (org.apache.zookeeper.server.NIOServerCnxn)
[2020-12-01 16:00:49,851] WARN Exception causing close of session 0x0: Unreasonable length = 1718383973 (org.apache.zookeeper.server.NIOServerCnxn)
[2020-12-01 16:00:59,851] WARN Exception causing close of session 0x0: Unreasonable length = 1718383973 (org.apache.zookeeper.server.NIOServerCnxn)
[2020-12-01 16:01:09,856] WARN Exception causing close of session 0x0: Unreasonable length = 1718383973 (org.apache.zookeeper.server.NIOServerCnxn)
[2020-12-01 16:01:18,576] WARN Exception causing close of session 0x0: Unreasonable length = 1718383973 (org.apache.zookeeper.server.NIOServerCnxn)
[2020-12-01 16:01:28,580] WARN Exception causing close of session 0x0: Unreasonable length = 1718383973 (org.apache.zookeeper.server.NIOServerCnxn)
[2020-12-01 16:01:38,580] WARN Exception causing close of session 0x0: Unreasonable length = 1718383973 (org.apache.zookeeper.server.NIOServerCnxn)
[2020-12-01 16:01:46,192] WARN Exception causing close of session 0x0: Unreasonable length = 1718383973 (org.apache.zookeeper.server.NIOServerCnxn)
[2020-12-01 16:01:55,227] WARN Exception causing close of session 0x0: Unreasonable length = 1718383973 (org.apache.zookeeper.server.NIOServerCnxn)
[2020-12-01 16:02:05,231] WARN Exception causing close of session 0x0: Unreasonable length = 1718383973 (org.apache.zookeeper.server.NIOServerCnxn)
[2020-12-01 16:02:14,033] WARN Exception causing close of session 0x0: Unreasonable length = 1718383973 (org.apache.zookeeper.server.NIOServerCnxn)
[2020-12-01 16:02:21,884] WARN Exception causing close of session 0x0: Unreasonable length = 1718383973 (org.apache.zookeeper.server.NIOServerCnxn)
[2020-12-01 16:02:29,387] WARN Exception causing close of session 0x0: Unreasonable length = 1718383973 (org.apache.zookeeper.server.NIOServerCnxn)
[2020-12-01 16:02:39,399] WARN Exception causing close of session 0x0: Unreasonable length = 1718383973 (org.apache.zookeeper.server.NIOServerCnxn)
[2020-12-01 16:02:50,368] WARN Exception causing close of session 0x0: Unreasonable length = 1718383973 (org.apache.zookeeper.server.NIOServerCnxn)
[2020-12-01 16:02:53,368] WARN Exception causing close of session 0x0: Unreasonable length = 1718383973 (org.apache.zookeeper.server.NIOServerCnxn)
[2020-12-01 16:02:53,467] WARN Exception causing close of session 0x0: Unreasonable length = 1718383973 (org.apache.zookeeper.server.NIOServerCnxn)
[2020-12-01 16:02:53,895] WARN Exception causing close of session 0x0: Unreasonable length = 1718383973 (org.apache.zookeeper.server.NIOServerCnxn)
[2020-12-01 16:02:54,612] WARN Exception causing close of session 0x0: Unreasonable length = 1718383973 (org.apache.zookeeper.server.NIOServerCnxn)
[2020-12-01 16:02:58,736] WARN Exception causing close of session 0x0: Unreasonable length = 1718383973 (org.apache.zookeeper.server.NIOServerCnxn)

如果我将 SecurityProtocol = SecurityProtocol.Ssl, 添加到生产者配置中，则会收到以下错误：

{ssl://localhost:2181/bootstrap: SSL handshake failed: Disconnected: connecting to a PLAINTEXT broker listener? (after 2ms in state CONNECT)}

它还需要什么来下定决心并开始工作？

Answer 1

I start whatever it is with zookeeper-server-start

The Kafka console window

那是 Zookeeper 服务器，不是 Kafka

您需要一个单独的 window，它以 config/server.properties 文件开头 kafka-server-start。

那么您的代码将使用端口 9092（默认情况下），正如您在显示的代码中所评论的那样。

If I add SecurityProtocol = SecurityProtocol.Ssl, to producer config, then I get the following error instead

据我所知，您从未在 Kafka 服务器中设置任何 SSL 属性，因此这不会改变任何内容

立即构建 Kafka 生产者会导致 "Disconnected while requesting ApiVersion" 错误

Building a Kafka producer immediately results "Disconnected while requesting ApiVersion" error

c#

apache-kafka

kafka-producer-api

.net-4.7.2