Hi,
I am intending to save the streaming data from kafka into Cassandra,
using spark-streaming:
But there seems to be problem with line
javaFunctions(data).writerBuilder("testkeyspace", "test_table",
mapToRow(TestTable.class)).saveToCassandra();
I am getting 2 errors.
the code, the error-log and POM.xml dependencies are listed below:
Please help me find the reason as to why is this happening.
public class SparkStream {
static int key=0;
public static void main(String args[]) throws Exception
{
if(args.length != 3)
{
System.out.println("SparkStream <zookeeper_ip> <group_nm>
<topic1,topic2,...>");
System.exit(1);
}
Logger.getLogger("org").setLevel(Level.OFF);
Logger.getLogger("akka").setLevel(Level.OFF);
Map<String,Integer> topicMap = new HashMap<String,Integer>();
String[] topic = args[2].split(",");
for(String t: topic)
{
topicMap.put(t, new Integer(3));
}
/* Connection to Spark */
SparkConf conf = new SparkConf();
JavaSparkContext sc = new JavaSparkContext("local[4]",
"SparkStream",conf);
JavaStreamingContext jssc = new JavaStreamingContext(sc, new
Duration(3000));
/* connection to cassandra */
/* conf.set("spark.cassandra.connection.host", "127.0.0.1:9042");
CassandraConnector connector = CassandraConnector.apply(sc.getConf());
Session session = connector.openSession();
session.execute("CREATE TABLE IF NOT EXISTS testkeyspace.test_table
(key INT PRIMARY KEY, value TEXT)");
*/
/* Receive Kafka streaming inputs */
JavaPairReceiverInputDStream<String, String> messages =
KafkaUtils.createStream(jssc, args[0], args[1], topicMap );
/* Create DStream */
JavaDStream<TestTable> data = messages.map(new
Function<Tuple2<String,String>, TestTable >()
{
public TestTable call(Tuple2<String, String> message)
{
return new TestTable(new Integer(++key), message._2() );
}
}
);
/* Write to cassandra */
javaFunctions(data).writerBuilder("testkeyspace", "test_table",
mapToRow(TestTable.class)).saveToCassandra();
// data.print();
jssc.start();
jssc.awaitTermination();
}
}
class TestTable implements Serializable
{
Integer key;
String value;
public TestTable() {}
public TestTable(Integer k, String v)
{
key=k;
value=v;
}
public Integer getKey(){
return key;
}
public void setKey(Integer k){
key=k;
}
public String getValue(){
return value;
}
public void setValue(String v){
value=v;
}
public String toString(){
return MessageFormat.format("TestTable'{'key={0},
value={1}'}'", key, value);
}
}
The output log is:
[INFO] Compiling 1 source file to
/root/Documents/SparkStreamSample/target/classes
[INFO] 2 errors
[INFO] -------------------------------------------------------------
[ERROR] COMPILATION ERROR :
[INFO] -------------------------------------------------------------
[ERROR]
/root/Documents/SparkStreamSample/src/main/java/com/spark/SparkStream.java:[76,81]
cannot find symbol
symbol: method mapToRow(java.lang.Class<com.spark.TestTable>)
location: class com.spark.SparkStream
[ERROR]
/root/Documents/SparkStreamSample/src/main/java/com/spark/SparkStream.java:[76,17]
no suitable method found for
javaFunctions(org.apache.spark.streaming.api.java.JavaDStream<com.spark.TestTable>)
method
com.datastax.spark.connector.CassandraJavaUtil.<T>javaFunctions(org.apache.spark.streaming.api.java.JavaDStream<T>,java.lang.Class<T>)
is not applicable
(cannot infer type-variable(s) T
(actual and formal argument lists differ in length))
method
com.datastax.spark.connector.CassandraJavaUtil.<T>javaFunctions(org.apache.spark.streaming.dstream.DStream<T>,java.lang.Class<T>)
is not applicable
(cannot infer type-variable(s) T
(actual and formal argument lists differ in length))
method
com.datastax.spark.connector.CassandraJavaUtil.<T>javaFunctions(org.apache.spark.api.java.JavaRDD<T>,java.lang.Class<T>)
is not applicable
(cannot infer type-variable(s) T
(actual and formal argument lists differ in length))
method
com.datastax.spark.connector.CassandraJavaUtil.<T>javaFunctions(org.apache.spark.rdd.RDD<T>,java.lang.Class<T>)
is not applicable
(cannot infer type-variable(s) T
(actual and formal argument lists differ in length))
method
com.datastax.spark.connector.CassandraJavaUtil.javaFunctions(org.apache.spark.streaming.api.java.JavaStreamingContext)
is not applicable
(argument mismatch;
org.apache.spark.streaming.api.java.JavaDStream<com.spark.TestTable>
cannot be converted to
org.apache.spark.streaming.api.java.JavaStreamingContext)
method
com.datastax.spark.connector.CassandraJavaUtil.javaFunctions(org.apache.spark.streaming.StreamingContext)
is not applicable
(argument mismatch;
org.apache.spark.streaming.api.java.JavaDStream<com.spark.TestTable>
cannot be converted to org.apache.spark.streaming.StreamingContext)
method
com.datastax.spark.connector.CassandraJavaUtil.javaFunctions(org.apache.spark.api.java.JavaSparkContext)
is not applicable
(argument mismatch;
org.apache.spark.streaming.api.java.JavaDStream<com.spark.TestTable>
cannot be converted to org.apache.spark.api.java.JavaSparkContext)
method
com.datastax.spark.connector.CassandraJavaUtil.javaFunctions(org.apache.spark.SparkContext)
is not applicable
(argument mismatch;
org.apache.spark.streaming.api.java.JavaDStream<com.spark.TestTable>
cannot be converted to org.apache.spark.SparkContext)
And the POM dependencies are:
<dependency>
<groupId>org.apache.spark</groupId>
<artifactId>spark-streaming-kafka_2.10</artifactId>
<version>1.1.0</version>
</dependency>
<dependency>
<groupId>org.apache.spark</groupId>
<artifactId>spark-streaming_2.10</artifactId>
<version>1.1.0</version>
</dependency>
<dependency>
<groupId>com.datastax.spark</groupId>
<artifactId>spark-cassandra-connector_2.10</artifactId>
<version>1.1.0</version>
</dependency>
<dependency>
<groupId>com.datastax.spark</groupId>
<artifactId>spark-cassandra-connector-java_2.10</artifactId>
<version>1.0.4</version>
</dependency>
<dependency>
<groupId>org.apache.spark</groupId>
<artifactId>spark-core_2.10</artifactId>
<version>1.1.1</version>
</dependency>
<dependency>
<groupId>com.msiops.footing</groupId>
<artifactId>footing-tuple</artifactId>
<version>0.2</version>
</dependency>
<dependency>
<groupId>com.datastax.cassandra</groupId>
<artifactId>cassandra-driver-core</artifactId>
<version>1.0.8</version>
</dependency>
Thanks,
Aiman
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