【发布时间】：2014-11-11 16:32:07
【问题描述】：
我正在尝试编写一个简单的代码，在其中创建模式、插入一些表，然后提取一些信息并将其打印出来。但是，我遇到了一个错误。我正在使用 Datastax cassandra spark 连接器。我一直在使用这两个示例来帮助我尝试完成此操作：
https://gist.github.com/jacek-lewandowski/278bfc936ca990bee35a
但是，第二个示例不使用 cassandra spark 连接器或一般的 spark。
这是我的代码：
package com.angel.testspark.test;
import com.datastax.driver.core.ResultSet;
import com.datastax.driver.core.Row;
import com.datastax.driver.core.Session;
import com.datastax.spark.connector.cql.CassandraConnector;
import com.google.common.base.Optional;
import org.apache.spark.SparkConf;
import org.apache.spark.api.java.JavaPairRDD;
import org.apache.spark.api.java.JavaRDD;
import org.apache.spark.api.java.JavaSparkContext;
import org.apache.spark.api.java.function.FlatMapFunction;
import org.apache.spark.api.java.function.Function;
import org.apache.spark.api.java.function.Function2;
import org.apache.spark.api.java.function.PairFlatMapFunction;
import scala.Tuple2;
import java.io.Serializable;
import java.math.BigDecimal;
import java.text.MessageFormat;
import java.util.*;
import static com.datastax.spark.connector.CassandraJavaUtil.*;
public class App
{
private transient SparkConf conf;
private App(SparkConf conf) {
this.conf = conf;
}
private void run() {
JavaSparkContext sc = new JavaSparkContext(conf);
createSchema(sc);
sc.stop();
}
private void createSchema(JavaSparkContext sc) {
CassandraConnector connector = CassandraConnector.apply(sc.getConf());
// Prepare the schema
try (Session session = connector.openSession()) {
session.execute("DROP KEYSPACE IF EXISTS tester");
session.execute("CREATE KEYSPACE tester WITH replication = {'class': 'SimpleStrategy', 'replication_factor': 3}");
session.execute("CREATE TABLE tester.emp (id INT PRIMARY KEY, fname TEXT, lname TEXT, role TEXT)");
session.execute("CREATE TABLE tester.dept (id INT PRIMARY KEY, dname TEXT)");
session.execute(
"INSERT INTO tester.emp (id, fname, lname, role) " +
"VALUES (" +
"0001," +
"'Angel'," +
"'Pay'," +
"'IT Engineer'" +
");");
session.execute(
"INSERT INTO tester.emp (id, fname, lname, role) " +
"VALUES (" +
"0002," +
"'John'," +
"'Doe'," +
"'IT Engineer'" +
");");
session.execute(
"INSERT INTO tester.emp (id, fname, lname, role) " +
"VALUES (" +
"0003," +
"'Jane'," +
"'Doe'," +
"'IT Analyst'" +
");");
session.execute(
"INSERT INTO tester.dept (id, dname) " +
"VALUES (" +
"1553," +
"'Commerce'" +
");");
ResultSet results = session.execute("SELECT * FROM tester.emp " +
"WHERE role = 'IT Engineer';");
for (Row row : results) {
System.out.print(row.getString("fname"));
System.out.print(" ");
System.out.print(row.getString("lname"));
System.out.println();
}
System.out.println();
}
}
public static void main( String[] args )
{
if (args.length != 2) {
System.err.println("Syntax: com.datastax.spark.demo.JavaDemo <Spark Master URL> <Cassandra contact point>");
System.exit(1);
}
SparkConf conf = new SparkConf();
conf.setAppName("Java API demo");
conf.setMaster(args[0]);
conf.set("spark.cassandra.connection.host", args[1]);
App app = new App(conf);
app.run();
}
}
这是我的错误：
14/09/18 11:22:18 WARN util.Utils: Your hostname, APAY-M-R03K resolves to a loopback address: 127.0.0.1; using 10.150.79.164 instead (on interface en0)
14/09/18 11:22:18 WARN util.Utils: Set SPARK_LOCAL_IP if you need to bind to another address
14/09/18 11:22:18 INFO slf4j.Slf4jLogger: Slf4jLogger started
14/09/18 11:22:18 INFO Remoting: Starting remoting
14/09/18 11:22:18 INFO Remoting: Remoting started; listening on addresses :[akka.tcp://spark@10.150.79.164:50506]
14/09/18 11:22:18 INFO Remoting: Remoting now listens on addresses: [akka.tcp://spark@10.150.79.164:50506]
14/09/18 11:22:18 INFO spark.SparkEnv: Registering BlockManagerMaster
14/09/18 11:22:18 INFO storage.DiskBlockManager: Created local directory at /var/folders/57/8s5fx3ks06bd2rzkq7yg1xs40000gn/T/spark-local-20140918112218-2c8d
14/09/18 11:22:18 INFO storage.MemoryStore: MemoryStore started with capacity 2.1 GB.
14/09/18 11:22:18 INFO network.ConnectionManager: Bound socket to port 50507 with id = ConnectionManagerId(10.150.79.164,50507)
14/09/18 11:22:18 INFO storage.BlockManagerMaster: Trying to register BlockManager
14/09/18 11:22:18 INFO storage.BlockManagerMasterActor$BlockManagerInfo: Registering block manager 10.150.79.164:50507 with 2.1 GB RAM
14/09/18 11:22:18 INFO storage.BlockManagerMaster: Registered BlockManager
14/09/18 11:22:18 INFO spark.HttpServer: Starting HTTP Server
14/09/18 11:22:18 INFO server.Server: jetty-7.6.8.v20121106
14/09/18 11:22:18 INFO server.AbstractConnector: Started SocketConnector@0.0.0.0:50508
14/09/18 11:22:18 INFO broadcast.HttpBroadcast: Broadcast server started at http://10.150.79.164:50508
14/09/18 11:22:19 INFO spark.SparkEnv: Registering MapOutputTracker
14/09/18 11:22:19 INFO spark.HttpFileServer: HTTP File server directory is /var/folders/57/8s5fx3ks06bd2rzkq7yg1xs40000gn/T/spark-a0dc4491-1901-4a7a-86f4-4adc181fe45c
14/09/18 11:22:19 INFO spark.HttpServer: Starting HTTP Server
14/09/18 11:22:19 INFO server.Server: jetty-7.6.8.v20121106
14/09/18 11:22:19 INFO server.AbstractConnector: Started SocketConnector@0.0.0.0:50509
14/09/18 11:22:19 INFO server.Server: jetty-7.6.8.v20121106
14/09/18 11:22:19 INFO handler.ContextHandler: started o.e.j.s.h.ContextHandler{/storage/rdd,null}
14/09/18 11:22:19 INFO handler.ContextHandler: started o.e.j.s.h.ContextHandler{/storage,null}
14/09/18 11:22:19 INFO handler.ContextHandler: started o.e.j.s.h.ContextHandler{/stages/stage,null}
14/09/18 11:22:19 INFO handler.ContextHandler: started o.e.j.s.h.ContextHandler{/stages/pool,null}
14/09/18 11:22:19 INFO handler.ContextHandler: started o.e.j.s.h.ContextHandler{/stages,null}
14/09/18 11:22:19 INFO handler.ContextHandler: started o.e.j.s.h.ContextHandler{/environment,null}
14/09/18 11:22:19 INFO handler.ContextHandler: started o.e.j.s.h.ContextHandler{/executors,null}
14/09/18 11:22:19 INFO handler.ContextHandler: started o.e.j.s.h.ContextHandler{/metrics/json,null}
14/09/18 11:22:19 INFO handler.ContextHandler: started o.e.j.s.h.ContextHandler{/static,null}
14/09/18 11:22:19 INFO handler.ContextHandler: started o.e.j.s.h.ContextHandler{/,null}
14/09/18 11:22:19 INFO server.AbstractConnector: Started SelectChannelConnector@0.0.0.0:4040
14/09/18 11:22:19 INFO ui.SparkUI: Started Spark Web UI at http://10.150.79.164:4040
14/09/18 11:22:19 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.
14/09/18 11:22:19 INFO core.Cluster: New Cassandra host /127.0.0.1:9042 added
14/09/18 11:22:19 INFO cql.CassandraConnector: Connected to Cassandra cluster: Test Cluster
Exception in thread "main" com.datastax.driver.core.exceptions.InvalidQueryException: No indexed columns present in by-columns clause with Equal operator
at com.datastax.driver.core.exceptions.InvalidQueryException.copy(InvalidQueryException.java:35)
at com.datastax.driver.core.DefaultResultSetFuture.extractCauseFromExecutionException(DefaultResultSetFuture.java:256)
at com.datastax.driver.core.DefaultResultSetFuture.getUninterruptibly(DefaultResultSetFuture.java:172)
at com.datastax.driver.core.AbstractSession.execute(AbstractSession.java:52)
at com.datastax.driver.core.AbstractSession.execute(AbstractSession.java:36)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at com.datastax.spark.connector.cql.SessionProxy.invoke(SessionProxy.scala:33)
at com.sun.proxy.$Proxy6.execute(Unknown Source)
at com.angel.testspark.test.App.createSchema(App.java:85)
at com.angel.testspark.test.App.run(App.java:38)
at com.angel.testspark.test.App.main(App.java:109)
Caused by: com.datastax.driver.core.exceptions.InvalidQueryException: No indexed columns present in by-columns clause with Equal operator
at com.datastax.driver.core.Responses$Error.asException(Responses.java:97)
at com.datastax.driver.core.DefaultResultSetFuture.onSet(DefaultResultSetFuture.java:108)
at com.datastax.driver.core.RequestHandler.setFinalResult(RequestHandler.java:235)
at com.datastax.driver.core.RequestHandler.onSet(RequestHandler.java:367)
at com.datastax.driver.core.Connection$Dispatcher.messageReceived(Connection.java:584)
at org.jboss.netty.channel.SimpleChannelUpstreamHandler.handleUpstream(SimpleChannelUpstreamHandler.java:70)
at org.jboss.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:564)
at org.jboss.netty.channel.DefaultChannelPipeline$DefaultChannelHandlerContext.sendUpstream(DefaultChannelPipeline.java:791)
at org.jboss.netty.channel.Channels.fireMessageReceived(Channels.java:296)
at org.jboss.netty.handler.codec.oneone.OneToOneDecoder.handleUpstream(OneToOneDecoder.java:70)
at org.jboss.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:564)
at org.jboss.netty.channel.DefaultChannelPipeline$DefaultChannelHandlerContext.sendUpstream(DefaultChannelPipeline.java:791)
at org.jboss.netty.channel.Channels.fireMessageReceived(Channels.java:296)
at org.jboss.netty.handler.codec.frame.FrameDecoder.unfoldAndFireMessageReceived(FrameDecoder.java:462)
at org.jboss.netty.handler.codec.frame.FrameDecoder.callDecode(FrameDecoder.java:443)
at org.jboss.netty.handler.codec.frame.FrameDecoder.messageReceived(FrameDecoder.java:303)
at org.jboss.netty.channel.SimpleChannelUpstreamHandler.handleUpstream(SimpleChannelUpstreamHandler.java:70)
at org.jboss.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:564)
at org.jboss.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:559)
at org.jboss.netty.channel.Channels.fireMessageReceived(Channels.java:268)
at org.jboss.netty.channel.Channels.fireMessageReceived(Channels.java:255)
at org.jboss.netty.channel.socket.nio.NioWorker.read(NioWorker.java:88)
at org.jboss.netty.channel.socket.nio.AbstractNioWorker.process(AbstractNioWorker.java:108)
at org.jboss.netty.channel.socket.nio.AbstractNioSelector.run(AbstractNioSelector.java:318)
at org.jboss.netty.channel.socket.nio.AbstractNioWorker.run(AbstractNioWorker.java:89)
at org.jboss.netty.channel.socket.nio.NioWorker.run(NioWorker.java:178)
at org.jboss.netty.util.ThreadRenamingRunnable.run(ThreadRenamingRunnable.java:108)
at org.jboss.netty.util.internal.DeadLockProofWorker$1.run(DeadLockProofWorker.java:42)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:745)
14/09/18 11:22:20 INFO cql.CassandraConnector: Disconnected from Cassandra cluster: Test Cluster
我相信这可能只是一个语法错误，我只是不确定它在哪里以及它是什么。
任何帮助都会很棒，谢谢。我搜索了互联网，并没有找到一个简单的例子，只是在 java 中使用 cassandra 和 spark 插入数据和提取数据。
******edit：@BryceAtNetwork23 和@mikea 对我的语法错误是正确的，所以我编辑了问题并修复了它。我收到了一个新错误，所以我粘贴了新错误并更新了代码
【问题讨论】：
-
似乎某些进程已经在监听 4040。可能是您的应用程序或 Spark 正在运行（可能在另一个终端会话中）？使用
jps查看 Java 进程并清理它们。 -
@JacekLaskowski 感谢您的提示。我杀死了正在运行的进程，从而摆脱了“地址已在使用”错误。但是，我仍然有我的错误的第二部分。我已经编辑了我的原始帖子以显示我现在遇到的错误。
-
最后一个插入的格式似乎不正确。 “商务”应该是“'商务'”
-
谢谢。你是对的，但现在我遇到了一个新错误，我的相等运算符有问题。它需要是'=='吗？也许我会用代码尝试一下。
标签： java maven cassandra apache-spark connector