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Posted to issues@spark.apache.org by "John Snodgrass (JIRA)" <ji...@apache.org> on 2014/05/14 21:41:15 UTC
[jira] [Created] (SPARK-1834) NoSuchMethodError when invoking
JavaPairRDD.reduce() in Java
John Snodgrass created SPARK-1834:
-------------------------------------
Summary: NoSuchMethodError when invoking JavaPairRDD.reduce() in Java
Key: SPARK-1834
URL: https://issues.apache.org/jira/browse/SPARK-1834
Project: Spark
Issue Type: Bug
Components: Spark Core
Affects Versions: 0.9.1
Environment: Redhat Linux, Java 7, Hadoop 2.2, Scala 2.10.4
Reporter: John Snodgrass
I get a java.lang.NoSuchMethod error when invoking JavaPairRDD.reduce(). Here is the partial stack trace:
Exception in thread "main" java.lang.reflect.InvocationTargetException
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:601)
at org.apache.spark.deploy.worker.DriverWrapper$.main(DriverWrapper.scala:39)
at org.apache.spark.deploy.worker.DriverWrapper.main(DriverWrapper.scala)
Caused by: java.lang.NoSuchMethodError: org.apache.spark.api.java.JavaPairRDD.reduce(Lorg/apache/spark/api/java/function/Function2;)Lscala/Tuple2;
at JavaPairRDDReduceTest.main(JavaPairRDDReduceTest.java:49) ...
I'm using Spark 0.9.1. I checked to ensure that I'm compiling with the same version of Spark as I am running on the cluster. The reduce() method works fine with JavaRDD, just not with JavaPairRDD. Here is a code snippet that exhibits the problem:
ArrayList<Integer> array = new ArrayList<>();
for (int i = 0; i < 10; ++i) {
array.add(i);
}
JavaRDD<Integer> rdd = javaSparkContext.parallelize(array);
JavaPairRDD<String, Integer> testRDD = rdd.map(new PairFunction<Integer, String, Integer>() {
@Override
public Tuple2<String, Integer> call(Integer t) throws Exception {
return new Tuple2<>("" + t, t);
}
}).cache();
testRDD.reduce(new Function2<Tuple2<String, Integer>, Tuple2<String, Integer>, Tuple2<String, Integer>>() {
@Override
public Tuple2<String, Integer> call(Tuple2<String, Integer> arg0, Tuple2<String, Integer> arg1) throws Exception {
return new Tuple2<>(arg0._1 + arg1._1, arg0._2 * 10 + arg0._2);
}
});
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