Vert.x EventLoop线程块Inet6AddressImpl.lookupAllHostAddr

Question

在启动kafka生成器时，我在搜索dns条目（？）时遇到了超过4秒的非常奇怪的线程块，异常：

2019-02-11 10:00:33,982 WARN [vertx-blocked-thread-checker] io.vertx.core.impl.BlockedThreadChecker - Thread Thread[vert.x-eventloop-thread-0,5,main] has been blocked for 4172 ms, time limit is 1000 ms
io.vertx.core.VertxException: Thread blocked
    at java.net.Inet6AddressImpl.lookupAllHostAddr(Native Method)
    at java.net.InetAddress$2.lookupAllHostAddr(InetAddress.java:929)
    at java.net.InetAddress.getAddressesFromNameService(InetAddress.java:1324)
    at java.net.InetAddress.getAllByName0(InetAddress.java:1277)
    at java.net.InetAddress.getAllByName(InetAddress.java:1193)
    at java.net.InetAddress.getAllByName(InetAddress.java:1127)
    at java.net.InetAddress.getByName(InetAddress.java:1077)
    at java.net.InetSocketAddress.<init>(InetSocketAddress.java:220)
    at org.apache.kafka.clients.ClientUtils.parseAndValidateAddresses(ClientUtils.java:53)
    at org.apache.kafka.clients.producer.KafkaProducer.<init>(KafkaProducer.java:406)
    at org.apache.kafka.clients.producer.KafkaProducer.<init>(KafkaProducer.java:304)

它会发生一次（不是每次）我可以在vertx中以编程方式禁用ipv6查找吗？如何使此错误消失？

Answer 1

添加标志“-Djava.net.preferIPv4Stack = true”之后它解决了问题但是用InetAddress.getLocalHost()打开了一些其他问题，返回localhost \ 127.0.0.1 for hostname \ ip ...解决这个问题我必须编辑/ etc / hosts在机器中：

# This file is automatically generated by our bootstrap script.
<MACHINE_IP> <MACHINE_HOSTNAME>   # <-- Ordering ...
127.0.0.1 localhost

# The following lines are desirable for IPv6 capable hosts
# ::1 ip6-localhost ip6-loopback <MACHINE_HOSTNAME>   <-- IPV6 must be disabled

从/ etc / hosts禁用所有IPv6部分后，解析了正确的主机名和IP，并正确启动了我的程序