cassandra - 所有尝试查询的主机均失败

Question

我使用 Google 计算引擎建立了一个由三个 cassandra 节点组成的集群。 运行“nodetool status”后我得到:

antoniogallo88@cassandra-7m0w:~$ nodetool status
Datacenter: europe-west1
========================
Status=Up/Down
|/ State=Normal/Leaving/Joining/Moving
--  Address         Load       Tokens  Owns (effective)  Host ID                               Rack
UN  10.240.41.185   56.28 KB   256     33.2%             edf4c2c8-f746-4c86-8b1e-4d4317788de9  b
UN  10.240.145.130  56.31 KB   256     30.6%             76025d1d-b5e4-4510-afd9-e0c52ae4aa2b  b
UN  10.240.194.231  60.94 KB   256     36.2%             1c5594d6-4a62-4cb7-bb4e-ab15545af6a0  b

所以，一切正常。

cqlsh 命令也运行良好。

我的问题是当我运行以下命令时:

package com.example.cassandra;

import com.datastax.driver.core.Cluster;
import com.datastax.driver.core.Host;
import com.datastax.driver.core.Metadata;

    public class SimpleClient {
       private Cluster cluster;

       public void connect(String node, int port) {
          cluster = Cluster.builder()
               // .addContactPoints("10.240.41.185", "10.240.145.130", "10.240.194.231").withPort(port).build();
                  .addContactPoints(node).withPort(port).build();

          Metadata metadata = cluster.getMetadata();
          System.out.printf("Connected to cluster: %s\n", 
                metadata.getClusterName());
          for ( Host host : metadata.getAllHosts() ) {
             System.out.printf("Datatacenter: %s; Host: %s; Rack: %s\n",
                   host.getDatacenter(), host.getAddress(), host.getRack());
          }
       }

       public void close() {
          cluster.close();;
       }

       public static void main(String[] args) {
          SimpleClient client = new SimpleClient();
          client.connect("10.240.41.185", 9042);
          client.close();
       }
    }

然后我得到:

SLF4J: Defaulting to no-operation (NOP) logger implementation
SLF4J: See http://www.slf4j.org/codes.html#StaticLoggerBinder for further details.
Exception in thread "main" com.datastax.driver.core.exceptions.NoHostAvailableException: All host(s) tried for query failed (tried: /10.240.41.185:9042 (com.datastax.driver.core.TransportException: [/10.240.41.185:9042] Cannot connect))
    at com.datastax.driver.core.ControlConnection.reconnectInternal(ControlConnection.java:193)
    at com.datastax.driver.core.ControlConnection.connect(ControlConnection.java:79)
    at com.datastax.driver.core.Cluster$Manager.init(Cluster.java:1148)
    at com.datastax.driver.core.Cluster.getMetadata(Cluster.java:313)
    at com.example.cassandra.SimpleClient.connect(SimpleClient.java:15)
    at com.example.cassandra.SimpleClient.main(SimpleClient.java:30)

在 cassandra.yaml 中:

    start_native_transport: true
    rpc_address = 0.0.0.0
    native_transport_port: 9042
listen_address: 10.240.145.130

如果我必须编辑 cassandra.yaml 文件，如果我使用 Google 计算引擎，我该如何执行此操作？

谢谢

Answer 1

看来是防火墙问题。当9160和9042都允许流量后，连接终于建立。