stage | 易学教程

Spark RDD 概念以及核心原理

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2、依赖关系下的数据流视图　　　　　　在spark中，会根据RDD之间的依赖关系将DAG图划分为不同的阶段，对于窄依赖，由于partition依赖关系的确定性，partition的转换处理就可以在同一个线程里完成，窄依赖就被spark划分到同一个stage中，而对于宽依赖，只能等父RDD shuffle处理完成后，下一个stage才能开始接下来的计算。　　因此spark划分stage的整体思路是：从后往前推，遇到宽依赖就断开，划分为一个stage；遇到窄依赖就将这个RDD加入该stage中。因此在图2中RDD C,RDD D,RDD E,RDDF被构建在一个stage中,RDD A被构建在一个单独的Stage中,而RDD B和RDD G又被构建在同一个stage中。　　在spark中，Task的类型分为2种：ShuffleMapTask和ResultTask；　　简单来说，DAG的最后一个阶段会为每个结果的partition生成一个ResultTask，即每个Stage里面的Task的数量是由该Stage中最后一个RDD的Partition的数量所决定的！而其余所有阶段都会生成ShuffleMapTask；已经为大家精心准备了大数据的系统学习资料，从Linux-Hadoop-spark-......，需要的小伙伴可以点击

Putting an object on a stage when mouse clicked

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问题 package javafxapplication36; /** * Copyright (c) 2008, 2012 Oracle and/or its affiliates. * All rights reserved. Use is subject to license terms. */ import javafx.application.Application; import javafx.scene.Group; import javafx.scene.Scene; import javafx.stage.Stage; import javafx.animation.KeyFrame; import javafx.animation.KeyValue; import javafx.animation.Timeline; import javafx.beans.InvalidationListener; import javafx.beans.Observable; import javafx.event.ActionEvent; import javafx.event

AS3 Modify stage Objects from a class

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问题 In an external class i'm trying to modify a property of a stage object, Apple. I want to set it visible so i put in my code: Apple.visible =true; but it says that Apple is not defined, probably because it doesn't refeers to the stage one... how can I "import" it in my class? 回答1: Try something like: DisplayObjectContainer(stage.getChildAt(0)).getChildByName("Apple").visible = true; where stage.getChildAt(0) is "Main Timeline" movie, that contains all inner objects. 来源： https://stackoverflow

How to access stage in a class that is not a DisplayObject?

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问题 How do I access the stage in Actionscript 3 in a class which is not my main class and not a displayobject? 回答1: the easiest way is to use a global object http://github.com/inruntime/AS3-Global-Object this page has examples of how to set and retrieve objects from any class. 回答2: The easy way, you can keep it in a static var for example: public class MyMain extends Sprite { public static var STAGE:Stage; public function MyMain() { if (stage) init(); else addEventListener(Event.ADDED_TO_STAGE,

AS3 Cannot access stage from custom class

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问题 How can I access the stage and especially the width and mouse position of the flash Movie from a custom class? package classes { import flash.events.*; import flash.display.*; public class TableManager extends Sprite { public function TableManager() { sayStage(); } public function sayStage():void { trace(stage); } } } This will only return nill. I know that DisplayObjects don't have any stage until they have been initiated so you can't access the stage in your constructor but even if I call

shaking Stage in javaFX

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问题 is it possible to shake primary stage with Timeline and so Use XTimeline and YTimeLine? final Timeline Xtimeline = new Timeline();//for Animate On X'-Stage Xtimeline.setCycleCount(Timeline.INDEFINITE); Xtimeline.setAutoReverse(true); final Timeline Ytimeline = new Timeline();//for Animate On Y'-Stage Ytimeline.setCycleCount(Timeline.INDEFINITE); Ytimeline.setAutoReverse(true); 回答1: Try This.. int x = 0; int y = 0; public void shakeStage() { Timeline timelineX = new Timeline(new KeyFrame

mybatis级联

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web项目开发中目前很多企业都是在SSM框架基础上开发。其中的M指的的mybatis(ibatis).mybatis里指的一说的是规避了传统的jdbc等的繁琐。在mybatis中我们可以只用关注sql本身。而不用太在意之个执行过程。大大简化了我们平时的开发。mybatis深究的话会有很多要说的。今天我们只来看看mybatis中提供了映射中的关联标签。  数据准备数据结构下表stage_order中的stage_list是有stage表中ID组成的一个字符串，之间由逗号相隔。比如stage_list=1,2,3表示该stage_order中关联着ID为1或2或3的stage。我们得分别取查询stageID=1或2或3的stage进行实体映射展示。下一节我们看看实体的构造实体准备基本实体(对应stage_order单表) 在下面的实体中出现的注解我们不需要在意，这是swagger框架的注解，在本章节中不需要理解。换句话说我们可以吧注解删掉。不会影响我们的功能的。 @ApiModel(description = "阶段顺序表") @Table(name = "STAGE_ORDER") public class StageOrder { @Id @ApiModelProperty("阶段顺序ID") @NotNull(message =

Can you write two different Java FX scenes as two separate classes?

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问题 I'm a beginning Java programmer, finishing up the "Java 101" class at my local university. I'm also pushing myself to learn some extra topics on the side, including Java FX. I've worked through the Java FX tutorials on Oracle's website, plus sat through some YouTube videos, plus read "Java FX for Dummies" (which was the best book I could find for a beginner.) All of this material has taught me a lot of the basics, but some stuff that (should be) relatively simple escapes me. For example: Let

Why disabling of stage resizable dont work in javafx?

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问题 When I try to setResizable for my scene in javaFX application it doesn't work. I still can change window size. Here's the code for my test application: @Override public void start(Stage stage) throws Exception { // TODO Auto-generated method stub stage.setTitle("Test window"); stage.setWidth(300); stage.setHeight(200); stage.setResizable(false); stage.show(); } public static void main(String[] args) { // TODO Auto-generated method stub Application.launch(args); } Perhaps I missed something

Stage resizing and getting the right variable

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问题 In my Flash Application (AS3), I want to get the stage size and use that so my objects (which the user controls) can't go outside of the screen. However, when I use: stage.stageWidth; stage.stageHeight; The values I get aren't actually what I want. They give me the stage size, but if I resize the window, the numbers change as well. Now, in a html page, I don't think that will matter, because the user can't resize it... however, I'd like for it to be more solid than relying on the window size.