使用如下所示的小型测试 Java 程序,我可以登录到单个 Cassandra 2.0.1 节点并执行没有错误的查询:
$ java -classpath .:cassandra-driver-core-1.0.4.jar DriverTester 127.0.0.1 myusername mypassword
Got test query result 1ba51260-5b6e-11e3-8f1c-7dd8c1a15c4b
正如预期的那样,提供错误的密码失败并出现“用户名和/或密码不正确”错误。
但是,当使用正确的凭据对属于三节点集群的节点尝试相同的程序时,我收到一条有点令人困惑的“缺少必需的密钥'用户名'”消息:
$ java -classpath .:cassandra-driver-core-1.0.4.jar DriverTester cluster-node1 myusername mypassword
com.datastax.driver.core.exceptions.AuthenticationException: Authentication error on host /62.142.90.104: Required key 'username' is missing
at com.datastax.driver.core.Connection.initializeTransport(Connection.java:171)
at com.datastax.driver.core.Connection.<init>(Connection.java:132)
at com.datastax.driver.core.Connection.<init>(Connection.java:60)
at com.datastax.driver.core.Connection$Factory.open(Connection.java:419)
at com.datastax.driver.core.ControlConnection.tryConnect(ControlConnection.java:205)
at com.datastax.driver.core.ControlConnection.reconnectInternal(ControlConnection.java:168)
at com.datastax.driver.core.ControlConnection.connect(ControlConnection.java:81)
at com.datastax.driver.core.Cluster$Manager.init(Cluster.java:773)
at com.datastax.driver.core.Cluster$Manager.access$100(Cluster.java:706)
at com.datastax.driver.core.Cluster.<init>(Cluster.java:79)
at com.datastax.driver.core.Cluster.<init>(Cluster.java:66)
at com.datastax.driver.core.Cluster$Builder.build(Cluster.java:687)
at fi.elisa.viihde.stats.DriverTester.openDatastaxSession(DriverTester.java:40)
at fi.elisa.viihde.stats.DriverTester.doTest(DriverTester.java:28)
at fi.elisa.viihde.stats.DriverTester.main(DriverTester.java:15)
为什么会这样?
凭据是正确的,因为提供相同的凭据可以正常cqlsh
工作:
$ cqlsh cluster-node1 -u myusername -p mypassword
Connected to cluster-node1 at xx.xx.xx.xx:9160.
[cqlsh 4.0.1 | Cassandra 2.0.1 | CQL spec 3.1.1 | Thrift protocol 19.37.0]
Use HELP for help.
cqlsh>
测试程序代码:
import com.datastax.driver.core.Cluster;
import com.datastax.driver.core.Session;
public class DriverTester {
public static void main(String... args) {
try {
doTest(args);
} catch (Throwable t) {
t.printStackTrace();
System.exit(1);
}
System.exit(0);
}
public static void doTest(String... args) {
String[] hostnames = args[0].split(",");
String username = args[1];
String password = args[2];
Cluster.Builder clusterBuilder = Cluster.builder()
.addContactPoints(hostnames).withPort(9042)
.withCredentials(username, password);
Session session = clusterBuilder.build().connect();
System.out.println("Got test query result " +
session.execute("select now() from system.local").one().getUUID(0));
}
}