As we all know , up to Spark 1.6.2, JavaSparkContext only provides two kinds of accumulators: Integer and Double. However, unfortunately I've met with problems of Integer overflow and the program returned me a negative number. So I have to use origin…
转载自:http://www.jianshu.com/p/082ef79c63c1 broadcast 官方文档描述: Broadcast a read-only variable to the cluster, returning a [[org.apache.spark.broadcast.Broadcast]] object for reading it in distributed functions. The variable will be sent to each cluster …
不多说,直接上干货! spark-1.6.1-bin-hadoop2.6里Basic包下的JavaPageRank.java /* * Licensed to the Apache Software Foundation (ASF) under one or more * contributor license agreements. See the NOTICE file distributed with * this work for additional information regar…
broadcast 官方文档描述: Broadcast a read-only variable to the cluster, returning a [[org.apache.spark.broadcast.Broadcast]] object for reading it in distributed functions. The variable will be sent to each cluster only once. 函数原型: def broadcast[T](value:…
public class Main implements Serializable { /** * */ private static final long serialVersionUID = -8513279306224995844L; private static final String MYSQL_USERNAME = "demo"; private static final String MYSQL_PWD = "demo"; private stati…
读accumlator JobManager 在job finish的时候会汇总accumulator的值, newJobStatus match { case JobStatus.FINISHED => try { val accumulatorResults = executionGraph.getAccumulatorsSerialized() val result = new SerializedJobExecutionResult( jobID, jobInfo.duration,…
