如何在分布式模式下本地启动钻头？

Question

我下载了 Apache Drill v1.8，对其进行了编辑conf/drill-override.conf以进行以下更改：

drill.exec: {
  cluster-id: "drillbits1",
  zk.connect: "10.178.23.140:2181,10.178.23.140:2182,10.178.23.140:2183,10.178.23.140:2184"
}

..zookeeper 集群实际上由 4 个在同一台机器上启动的 Zookeeper 实例组成，我正在尝试启动 Drill。（即我只使用一台机器作为 Apache Drill 和 Zookeeper 的集群，机器的 IP 是10.178.23.140）

所以我不断收到这个错误：

Exception in thread "main" org.apache.drill.exec.exception.DrillbitStartupException: Failure during initial startup of Drillbit.
    at org.apache.drill.exec.server.Drillbit.start(Drillbit.java:295)
    at org.apache.drill.exec.server.Drillbit.start(Drillbit.java:271)
    at org.apache.drill.exec.server.Drillbit.main(Drillbit.java:267)
Caused by: org.apache.drill.exec.exception.DrillbitStartupException: Drillbit is disallowed to bind to loopback address in distributed mode.
    at org.apache.drill.exec.service.ServiceEngine.checkLoopbackAddress(ServiceEngine.java:186)
    at org.apache.drill.exec.service.ServiceEngine.start(ServiceEngine.java:146)
    at org.apache.drill.exec.server.Drillbit.run(Drillbit.java:119)
    at org.apache.drill.exec.server.Drillbit.start(Drillbit.java:291)
    ... 2 more

为什么钻头会抱怨绑定到回送地址？！

1. 我没有为钻头配置 IP 绑定到！
2. 并且由于我正在我的机器上启动钻头进程，我的机器会尝试绑定到哪些其他 IP？！

Answer 1

问题是我的/etc/hosts文件有这个条目

127.0.1.1   mgelbana-machine

这使我的主机名可以解析为环回地址。要解决此问题，您可以执行以下任一操作

• 删除这条线解决了我的问题。
• 将我的主机名解析为非环回 IP 地址。

来源

private void checkLoopbackAddress(String address) throws DrillbitStartupException, UnknownHostException {
  if (isDistributedMode && InetAddress.getByName(address).isLoopbackAddress()) {
    throw new DrillbitStartupException("Drillbit is disallowed to bind to loopback address in distributed mode.");
  }
}

Drill 绑定回环地址时拒绝启动的原因是为了区分在 Zookeeper 中注册的 Drill 节点。