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Josh Rosen commented on SPARK-1834: ----------------------------------- Note that SPARK-3266 has now been fixed for 1.3.1 / 1.4.0. > 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); > } > }); -- This message was sent by Atlassian JIRA (v6.3.4#6332) --------------------------------------------------------------------- To unsubscribe, e-mail: issues-unsubscr...@spark.apache.org For additional commands, e-mail: issues-h...@spark.apache.org