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我尝试执行代码,但出现以下错误: java.lang.OutOfMemoryError: Java heap space org.apache.spark.shuffle.MetadataFetchFailedException: Missing an output location for shuffle 4

该代码可以在小文件(一些 kb)上执行,但在“大”文件(5mb)上我得到错误。我尝试增加 VM 内存和 spark.driver.memory 但我再次遇到相同的错误。

parkConf sparkConf = new SparkConf().setAppName("aName");
        JavaSparkContext sc = new JavaSparkContext(sparkConf);
        
        JavaRDD<String> lines = sc.textFile(args[0]);
        
        JavaPairRDD<String, String> edges = lines.flatMapToPair(t -> {
            List<Tuple2<String,String>> result = new ArrayList<>();
            if(!t.contains("#")) {
                String [] nodes = SPACE.split(t);
                if(Long.parseLong(nodes[0])<Long.parseLong(nodes[1])) {
                    result.add(new Tuple2<>(nodes[0], nodes[1]));
                } else {
                    result.add(new Tuple2<>(nodes[1], nodes[0]));
                }
            }
            return result.iterator();
        });
        
        JavaPairRDD<String, String> edgesReverse = edges.mapToPair(t -> {
            return new Tuple2<>(t._2(), t._1());
        });
        JavaPairRDD<String, Tuple2<String, String>> rdd1 = edges.join(edgesReverse);
        JavaPairRDD<String, Tuple2<String, String>> rdd2 = edges.join(edges);
        JavaPairRDD<String, Tuple2<String, String>> allRDD = rdd1.union(rdd2).distinct();
        
        JavaPairRDD<Tuple2<String, String>,Double> commonNeighbors = allRDD.mapToPair(t -> {
            if(Long.parseLong(t._2()._1())<Long.parseLong(t._2()._2())) {
                return new Tuple2<>(t._2()._1(),t._2()._2());
            } else {
                return new Tuple2<>(t._2()._2(),t._2()._1());
            }
        }).subtract(edges).mapToPair(t->{
            return new Tuple2<>(t,Double.parseDouble("1"));
        }).reduceByKey((a,b)->a+b).mapToPair(t -> {           
            return new Tuple2<>(t._2(),t._1());
        }).sortByKey(false).mapToPair(t -> {
            return new Tuple2<>(t._2(),t._1());
        });
        
        commonNeighbors.saveAsTextFile(args[1]);
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1 回答 1

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我建议重新分区并增加分区大小。

于 2021-02-01T07:29:02.850 回答