code:
directKafkaStream.foreachRDD(rdd ->
{
rdd.foreach(record ->
{
messages1.add(record._2);
});
JavaRDD<String> lines = sc.parallelize(messages1);
JavaPairRDD<Integer, String> data = lines.mapToPair(new
PairFunction<String, Integer, String>()
{
@Override
public Tuple2<Integer, String> call(String a)
{
String[] tokens = StringUtil.split(a, '%');
return new Tuple2<Integer,
String>(Integer.getInteger(tokens[3]),tokens[2]);
}
});
Function2<String, String, String> reduceSumFunc =
(accum, n) -> (accum.concat(n));
JavaPairRDD<Integer, String> yearCount =
data.reduceByKey(reduceSumFunc);
javaFunctions(yearCount).writerBuilder("movie_keyspace","movie_count",mapTupleToRow(Integer.class,String.class))
.withColumnSelector(someColumns("year","list_of_movies")).saveToCassandra();//
this is the error line
});
----------
error:
com.datastax.spark.connector.writer.NullKeyColumnException: Invalid
null value for key column year
at com.datastax.spark.connector.writer.RoutingKeyGenerator$$
anonfun$fillRoutingKey$1.apply$mcVI$sp(RoutingKeyGenerator.scala:49)
at scala.collection.immutable.Range.foreach$mVc$sp(Range.
scala:160)
at com.datastax.spark.connector.writer.RoutingKeyGenerator.
fillRoutingKey(RoutingKeyGenerator.scala:47)
at com.datastax.spark.connector.writer.RoutingKeyGenerator.
apply(RoutingKeyGenerator.scala:56)
at com.datastax.spark.connector.writer.TableWriter.
batchRoutingKey(TableWriter.scala:126)
at com.datastax.spark.connector.writer.TableWriter$$anonfun$
write$1$$anonfun$19.apply(TableWriter.scala:151)
at com.datastax.spark.connector.writer.TableWriter$$anonfun$
write$1$$anonfun$19.apply(TableWriter.scala:151)
at com.datastax.spark.connector.writer.GroupingBatchBuilder.
next(GroupingBatchBuilder.scala:107)
at com.datastax.spark.connector.writer.GroupingBatchBuilder.
next(GroupingBatchBuilder.scala:31)
at scala.collection.Iterator$class.foreach(Iterator.scala:
893)
at com.datastax.spark.connector.writer.GroupingBatchBuilder.
foreach(GroupingBatchBuilder.scala:31)
at com.datastax.spark.connector.writer.TableWriter$$anonfun$
write$1.apply(TableWriter.scala:158)
at com.datastax.spark.connector.writer.TableWriter$$anonfun$
write$1.apply(TableWriter.scala:135)
at com.datastax.spark.connector.cql.CassandraConnector$$
anonfun$withSessionDo$1.apply(CassandraConnector.scala:111)
at com.datastax.spark.connector.cql.CassandraConnector$$
anonfun$withSessionDo$1.apply(CassandraConnector.scala:110)
at com.datastax.spark.connector.cql.CassandraConnector.
closeResourceAfterUse(CassandraConnector.scala:140)
at com.datastax.spark.connector.cql.CassandraConnector.
withSessionDo(CassandraConnector.scala:110)
at com.datastax.spark.connector.writer.TableWriter.write(
TableWriter.scala:135)
at com.datastax.spark.connector.RDDFunctions$$anonfun$
saveToCassandra$1.apply(RDDFunctions.scala:37)
at com.datastax.spark.connector.RDDFunctions$$anonfun$
saveToCassandra$1.apply(RDDFunctions.scala:37)
at org.apache.spark.scheduler.ResultTask.runTask(ResultTask.
scala:70)
at org.apache.spark.scheduler.Task.run(Task.scala:86)
at org.apache.spark.executor.Executor$TaskRunner.run(
Executor.scala:274)
at java.util.concurrent.ThreadPoolExecutor.runWorker(
ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(
ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
----------
Trying to connect Kafka and cassandra using spark
Able to store a JavaRDD but not able to store a JavaPairRDD into
cassandra
I have given comment in the line where the error is
