Question

启动kafka生产者时，搜索dns条目（？）时，我遇到了超过4秒的异常线程阻塞，

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)

它偶尔发生一次（并非每次都发生）我可以在vertx中以编程方式禁用ipv6查找吗？如何使该错误消失？

Answer 1

在添加标志“ -Djava.net.preferIPv4Stack = true”后，它解决了问题，但使用InetAddress.getLocalHost()打开了其他一些问题，该问题返回localhost \ 127.0.0.1作为主机名\ ip ... 为了解决这个问题，我不得不将机器中的/ etc / hosts编辑为：

# 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，正确的主机名和IP已解析，并且我的程序正确启动

Vert.x EventLoop线程块Inet6AddressImpl.lookupAllHostAddr

1 个答案: