destination host is: hadoop-slave2:50020; java.net.UnknownHostException; For more details see:

java.net.UnknownHostException: hadoop-slave2

This error message indicates that the system was unable to resolve the hostname "hadoop-slave2" to an IP address. This could be due to a few different issues, such as a DNS configuration problem or a typo in the hostname.

To resolve this issue, you should check that the hostname is correct and can be resolved by your DNS server or local hosts file. You can also try using an IP address instead of a hostname to see if that resolves the issue.

相关问题

java.net.NoRouteToHostException: No route to host: connect

This exception is typically thrown by the Java networking classes when a connection attempt fails because there is no route to the specified host. This can happen for a variety of reasons, such as:

1. The destination host is not reachable from the local machine due to a network issue, such as a firewall blocking the connection or a misconfigured network interface.

2. The destination host is temporarily unavailable or offline.

3. The hostname or IP address used to connect to the remote host is incorrect or resolves to the wrong address.

To resolve this issue, you should first verify that the destination host is reachable from your local machine. You can try pinging the host or running a traceroute to diagnose any network issues. Additionally, you should ensure that the hostname or IP address used to connect to the remote host is correct and that any firewalls or network configurations are not blocking the connection.

WARN in net.logstash.logback.appender.LogstashTcpSocketAppender[LOGSTASH] - Log destination 10.137.142.186:5000: connection failed. java.net.SocketTimeoutException: connect timed out

抱歉，我无法提供关于具体网络连接失败的问题的解决方案。这可能是由于网络配置问题、目标主机不可达、防火墙设置等原因引起的。您可以尝试以下几个步骤来解决这个问题：

1. 确保目标主机的IP地址和端口号是正确的。
2. 检查您的网络连接，确保您能够访问目标主机。
3. 检查防火墙设置，确保允许与目标主机建立连接。
4. 检查目标主机的日志文件，查看是否有关于连接失败的错误信息。
5. 尝试使用其他工具或方法进行连接，以确定是否是代码问题还是网络配置问题。

如果您仍然无法解决问题，建议您咨询网络管理员或网络相关的专业人员进行进一步的帮助和支持。