stage

Spark数据倾斜解决方案及shuffle原理

由 99封情书 提交于 2019-12-09 21:30:03
数据倾斜调优与shuffle调优 数据倾斜发生时的现象 1）个别task的执行速度明显慢于绝大多数task(常见情况) 2）spark作业突然报OOM异常(少见情况) 数据倾斜发生的原理 在进行shuffle的时候，必须将各个节点上相同的key拉取到某个节点上的一个task来进行处理。此时如果某个key对应的数据量特别大的话，就会发生数据倾斜。以至于大部分task只需几分钟，而个别task需要几小时，导致整个task作业需要几个小时才能运行完成。而且如果某个task数据量特别大的时候，甚至会导致内存溢出的情况。 定位数据倾斜发生的位置 数据倾斜只会发生在shuffle过程中，因此我们要先确定数据倾斜发生在第几个stage中，我们可以通过Web UI来查看当前运行到了第一个stage，以及该stage中各个task分配的数据量，来确定是不是由数据分配不均导致的数据倾斜。 一旦确定数据倾斜是由数据分配不均导致，下一步就要确定数据倾斜发生在哪一个stage之后，根据代码中的shuffle算子，推算出stage与代码的对应关系，判定数据倾斜发生的位置。 数据倾斜的解决方案 1）使用Hive ETL预处理数据 适用场景 ：Hive里的源数据本身就不均匀，并且需要对Hive表频繁进行shuffle操作 解决方案 ：在Hive中预先对数据按照key进行聚合或是和其他表进行join

TypeWriting

由 十年热恋 提交于 2019-12-09 15:11:02
头文件getputch.h /* * getputch.c */ /* 用于getch/putch的通用头文件"getputch.h" */ #ifndef __GETPUTCH #define __GETPUTCH #if defined(_MSC_VER) || (__TURBOC__) || (LSI_C) /* MS-Windows／MS-DOS（Visual C++, Borland C++, LSI-C 86 etc ...）*/ #include <conio.h> static void init_getputch(void) { /* 空 */ } static void term_getputch(void) { /* 空 */ } #else /* 提供了Curses库的UNIX/Linux/OS X环境 */ #include <curses.h> #undef putchar #undef puts #undef printf static char __buf[4096]; /*--- _ _putchar：相当于putchar函数（用“换行符+回车符”代替换行符进行输出）---*/ static int __putchar(int ch) { if (ch == '\n') putchar('\r'); return putchar(ch); } /*

How to stop WebEngine after closing stage JavaFX?

由 你说的曾经没有我的故事 提交于 2019-12-09 01:04:03
问题 When i create new stage with WebEngine that playing video from YouTube, after i close it - Youtube keeps playing on backgroung. If i use "Platform.exit" - its close all my JavaFX App, but i want to close only stage that been created for YouTube. This is my class for YouTube player: public class YouTube_player { public YouTube_player(String url) { final Group root = new Group(); Scene scene = new Scene(root, 820, 480); final Stage stage = new Stage(); final WebView webView = new WebView();

Couldn't find preset \"es2015\" relative to directory

由 心已入冬 提交于 2019-12-08 09:43:29
在引入element-ui引发的问题，解决如下： 　　1.npm install babel-preset-es2015 --save-dev 　　2.修改.babelrc 　　　　 { "presets": [ ["es2015", { "modules": false }], ["env", { "modules": false, "targets": { "browsers": ["> 1%", "last 2 versions", "not ie <= 8"] } }], "stage-2" ], "plugins": [ "transform-vue-jsx", "transform-runtime", [ "component", { "libraryName": "element-ui", "styleLibraryName": "theme-chalk" } ] ], "env": { "test": { "presets": ["env", "stage-2"] } } } 　　3.在webpack.base.conf.js文件中加入如下代码： 　　 loaders: [ { test: /\.js$/, exclude: /(node_modules|bower_components)/, loader: 'babel', query: { presets: [

AS3: Hide elements outside the stage in loaded swf

由 只愿长相守 提交于 2019-12-08 08:21:26
问题 Myapp loads an external swf and adds it to MovieClip. External swf movie has elements that are placed outside the stage (they go on the stage during swf playing). But after loading that elements are visible in the main MovieClip. In other words, it looks like the whole space outside the stage is visible as well as the stage. How to hide elements outside the stage of loaded swf? 回答1: Adobe has a page about this, with the following code example showing you how to add a mask to the loaded clip

Call JavaFX application twice

由 旧城冷巷雨未停 提交于 2019-12-08 05:44:17
问题 I would need help with the following: I am implementing an application in javafx, this application Is called through a click on a button. The problem is that when I close the application then I can not call it again. I have read that you can not call the Application.launch() method more than once. But I found something on the service class. The examples in the documentation page are not very clear. Anyone have an idea of ​​how this could be done? Thank you. http://docs.oracle.com/javafx/2

how to fix - stageResult set to FAILURE but still get success in jenkins

由 落爺英雄遲暮 提交于 2019-12-08 03:36:57
问题 I'm trying to create a very simple pipeline, it has one stage and one step. it uses the job 'build' I created as freestyle (which works) but I added an error (the parameter project name has a wrong value - 'test3' instead of 'test') when I ran it, it stay green and send "success" although it failed - if I enter the log I'll see this: Running in Durability level: MAX_SURVIVABILITY [Pipeline] Start of Pipeline [Pipeline] node Running on Jenkins in C:\Program Files (x86)\Jenkins\workspace

spark val b = a.flatMap(x => 1 to x)详解

由 烈酒焚心 提交于 2019-12-07 20:13:41
flatMap 与map类似，区别是原RDD中的元素经map处理后只能生成一个元素，而原RDD中的元素经flatmap处理后可生成多个元素来构建新RDD。 举例：对原RDD中的每个元素x产生y个元素（从1到y，y为元素x的值） val b = a.flatMap(x => 1 to x) 根据a中的每个元素的值从1开始每次累加1，直到等于该元素值，生成列表。例如：元素是1，列表是1；元素是2，列表是1、2； 例如： scala> val a = sc.parallelize(1 to 4, 2) 1.生成4个列表： 1 1、2 1、2、3 1、2、3、4 2.合并4个列表 1、1、2、 1、2、3、 1、2、3、4 scala> val a = sc.parallelize(1 to 4, 2) scala> val b = a.flatMap(x => 1 to x) scala> b.collect res12: Array[Int] = Array(1, 1, 2, 1, 2, 3, 1, 2, 3, 4) scala> val a = sc.parallelize(1 to 4, 2) a: org.apache.spark.rdd.RDD[Int] = ParallelCollectionRDD[73] at parallelize at <console>:22

git 语法

由 走远了吗. 提交于 2019-12-07 18:01:17
git reset 用法 先用git log 表明日志，再用git reset –hard +添加日志后面的东西。 在这里版本库，.git文件夹就是版本库，其中stage就是暂存区 ，git add命令实际上就是把要提交的所有修改放到暂存区（Stage），然后，执行git commit就可以一次性把暂存区的所有修改提交到分支。 git commit以前理解错了，实际上git commit 保存快照。 git 3步 来源： CSDN 作者： wosiguwozai0133 链接： https://blog.csdn.net/wosiguwozai0133/article/details/52801981

Git: ability to stage a certain file content without touching the working tree

由 让人想犯罪 __ 提交于 2019-12-07 13:35:40
问题 I want to modify the index of one (text) file without having to change the working tree file state. Is this possible? 回答1: Another take on "changing file in index without altering working dir" is to apply a patch to index only. This is often the way GUI git clients stage only selected lines from a given file. You start out by (if you want) clearing out the changes from index for that file: git reset path/to/file Then extracting the full patch for it git diff path/to/file > /path/to/tmpfile
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