[英]Connecting to remote Cassandra server shows NoHostAvailableException
关于Cassandra NoHostAvailableException
有很多问题。 即使关注了其中许多问题,我仍然无法解决此问题。
在本地计算机上,我无法使用Java访问cassandra DB。
java代码是:( 在远程服务器中 )
import com.datastax.driver.core.Cluster;
import com.datastax.driver.core.ResultSet;
import com.datastax.driver.core.Session;
public class Read_Data {
public static void main(String args[])throws Exception{
//queries
String query = "select title,hotel_id,comment from agoda_kuchikomi limit 1";
//Creating Cluster object
Cluster cluster = Cluster.builder().addContactPoint("172.15.81.249").build();
//Creating Session object
Session session = cluster.connect("kuchikomi");
//Getting the ResultSet
ResultSet result = session.execute(query);
System.out.println(result.all());
}
}
错误是
SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder".
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: /172.15.81.249:9042 (com.datastax.driver.core.exceptions.TransportException: [/172.15.81.249:9042] Cannot connect))
at com.datastax.driver.core.ControlConnection.reconnectInternal(ControlConnection.java:232)
at com.datastax.driver.core.ControlConnection.connect(ControlConnection.java:79)
at com.datastax.driver.core.Cluster$Manager.negotiateProtocolVersionAndConnect(Cluster.java:1600)
at com.datastax.driver.core.Cluster$Manager.init(Cluster.java:1518)
at com.datastax.driver.core.Cluster.init(Cluster.java:159)
at com.datastax.driver.core.Cluster.connectAsync(Cluster.java:330)
at com.datastax.driver.core.Cluster.connect(Cluster.java:280)
at Read_Data.main(Read_Data.java:17)
Cassandra托管在AWS ec2实例中。
我的cassandra.yaml
文件具有
rpc_address: 0.0.0.0
#我已经将它从172.15.81.249更改为0.0.0.0
broadcast_rpc_address: 172.15.81.249
native_transport_port: 9042
rpc_port: 9160
我的AWS实例不允许使用IP,因此我在Cassandra AWS实例上添加了一些入站规则,以允许在存在源代码的地方使用ip。 就是这样。
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