搭建Spark环境后,调测Spark样例时,出现下面的错误:WARN scheduler.TaskSchedulerImpl: Initial job has not accepted any resources; check your cluster UI to ensure that workers are registered and have sufficient resources [hadoop@gpmaster bin]$ ./run-example org.apache.spar…
1. Install junit a) Download “junit.jar” b) In eclipse, Windows->Preferences->Java->Build Path->Classpath variables->New, add "junit.jar" file. 2. Install hamcrest a) Download “hamcrest.jar” b) In eclipse, Win…
LCOW containers can now be run next to Windows containers.Use '--platform=linux' in Windows container mode to run Linux images.This is an experimental feature; If you want to disable Daemon 'experimental' option and had pull lcow images, you must res…
At first, I'd like to say thank you to MIT open courses which give me the privilege to enjoy the most outstanding education resources. Okay, come to the point. When I was learning the second-order homogeneous differential equation, the professor quot…
Well, to begin with, I'd like to say thank you to MIT open courses twice. It's their generosity that gives me the priviledge to enjoy the most outstanding education resources. Okay, come to the point -- The Frequency in Oscillation System. In general…
日期:2018.10.18 星期四 博客期:020 小试验任务: 我就发一下代码好了!!! package test1; import java.util.Scanner; public class Aobj { public static int num = 0; public static void setOff(){ System.out.println(num); } public void Run(){ } //构造方法 public Aobj(){ num++; } //主方法 pu…
Golang How To Install Go and Set Up a Local Programming Environment on macOS Build A Go API 40+ practical string tips [cheat sheet] Using Go Modules Practical Go: Real world advice for writing maintainable Go programs Why are my Go executable files s…
1.在spark SQL的一个test中 无论是registerAsTable还是registerTempTable 都会有问题,经过查找各种资料,采用如下的方式: val sqlCon=new org.apache.spark.sql.SQLContext(sc) import sqlContext. val data=sc.textFile("hdfs://spark-master.dragon.org:8020/user/a.csv") case class Person(cna…