如何使用SparkConf连接到远程Cassandra集群时传递"需要身份验证"？

Question

我正在尝试使用apache spark和cassandra进行数据分析.所以我写了一个java代码来访问在远程机器上运行的cassandra.我使用了以下java代码.

public class JavaDemo implements Serializable {
private transient SparkConf conf;

private JavaDemo(SparkConf conf) {
    this.conf = conf;
}

private void run() {
    JavaSparkContext sc = new JavaSparkContext(conf);
    generateData(sc);
    compute(sc);
    showResults(sc);
    sc.stop();
}

private void generateData(JavaSparkContext sc) {
    CassandraConnector connector = CassandraConnector.apply(sc.getConf());
    Session session = connector.openSession();

    // Prepare the schema

        session.execute("DROP KEYSPACE IF EXISTS java_api");
        session.execute("CREATE KEYSPACE java_api WITH replication = {'class': 'SimpleStrategy', 'replication_factor': 1}");
        session.execute("CREATE TABLE java_api.products (id INT PRIMARY KEY, name TEXT, parents LIST<INT>)");
        session.execute("CREATE TABLE java_api.sales (id UUID PRIMARY KEY, product INT, price DECIMAL)");
        session.execute("CREATE TABLE java_api.summaries (product INT PRIMARY KEY, summary DECIMAL)");

}

private void compute(JavaSparkContext sc) {
    System.out.println("IN compute");
}

private void showResults(JavaSparkContext sc) {
    System.out.println("IN showResults");
}

public static void main(String[] args) {


    SparkConf conf = new SparkConf();
    conf.setAppName("Java API demo");
    conf.setMaster("local[1]");
    System.out.println("---------------------------------");
    conf.set("spark.cassandra.connection.host", "192.168.1.219");


    JavaDemo app = new JavaDemo(conf);
    app.run();
} 

}

192.168.1.219是我运行cassandra的远程主机.默认端口是9160.当我runtis progran我得到跟随错误.

    15/01/29 10:14:26 INFO ui.SparkUI: Started Spark Web UI at http://Justin:4040
15/01/29 10:14:27 WARN core.FrameCompressor: Cannot find LZ4 class, you should make sure the LZ4 library is in the classpath if you intend to use it. LZ4 compression will not be available for the protocol.
Exception in thread "main" com.datastax.driver.core.exceptions.AuthenticationException: Authentication error on host /192.168.1.219:9042: Host /192.168.1.219:9042 requires authentication, but no authenticator found in Cluster configuration
    at com.datastax.driver.core.AuthProvider$1.newAuthenticator(AuthProvider.java:38)
    at com.datastax.driver.core.Connection.initializeTransport(Connection.java:139)
    at com.datastax.driver.core.Connection.<init>(Connection.java:111)
    at com.datastax.driver.core.Connection$Factory.open(Connection.java:445)
    at com.datastax.driver.core.ControlConnection.tryConnect(ControlConnection.java:216)
    at com.datastax.driver.core.ControlConnection.reconnectInternal(ControlConnection.java:172)
    at com.datastax.driver.core.ControlConnection.connect(ControlConnection.java:80)
    at com.datastax.driver.core.Cluster$Manager.init(Cluster.java:1145)
    at com.datastax.driver.core.Cluster.getMetadata(Cluster.java:313)
    at com.datastax.spark.connector.cql.CassandraConnector$.com$datastax$spark$connector$cql$CassandraConnector$$createSession(CassandraConnector.scala:166)
    at com.datastax.spark.connector.cql.CassandraConnector$$anonfun$4.apply(CassandraConnector.scala:151)
    at com.datastax.spark.connector.cql.CassandraConnector$$anonfun$4.apply(CassandraConnector.scala:151)
    at com.datastax.spark.connector.cql.RefCountedCache.createNewValueAndKeys(RefCountedCache.scala:36)
    at com.datastax.spark.connector.cql.RefCountedCache.acquire(RefCountedCache.scala:61)
    at com.datastax.spark.connector.cql.CassandraConnector.openSession(CassandraConnector.scala:72)
    at com.datastax.spark.demo.JavaDemo.generateData(JavaDemo.java:42)
    at com.datastax.spark.demo.JavaDemo.run(JavaDemo.java:34)
    at com.datastax.spark.demo.JavaDemo.main(JavaDemo.java:73)

有什么我想念的吗？它直接连接到端口9042.我如何连接它？

Answer 1

看起来您在cassandra集群上配置了身份验证.由于您不提供凭据,因此不允许您进行连接.您可以使用此处所述的spark.cassandra.auth.username和spark.cassandra.auth.password属性传递身份验证凭据.

所以你可以这样做:

conf.set("spark.cassandra.auth.username", "cassandra");            
conf.set("spark.cassandra.auth.password", "cassandra");

在你的代码中使这项工作.

如果您启用了身份验证并且尚未创建/更改任何用户,则可以使用"cassandra"获取用户名和密码.在生产中,您应该创建一个单独的帐户并使用它,并更改cassandra用户密码,因为它可以访问所有内容.