question: there are two actions for a user to invest and refund (for example, if An invests 100000 yuan, then he will get a rebate of 10 yuan after maturity). When the user does not make any investment within 6 months, the next investment will be regard...
execute two programs in spark-shell: first paragraph sortBy: val list1: List[(String, Int)] = List(("the", 12), ("they", 2), ("do", 4), ("wild", 1), ("and", 5), ("into", 4)) val listRDD1: RDD...
problem description because the temporary table created by DF needs to be queried many times, so the temporary table is cached, but it doesn t work? the amount of data is relatively large, about 10 billion, so it is necessary to optimize the efficie...
problem description regular expression memory overflow, JVM can t check memory, accumulate all the time, and then the program hangs the environmental background of the problems and what methods you have tried delete the second set of parentheses ...
val a = Array a (1) where a (1) should be called the apply method of class Array I don t see where the specific implementation is in the source code. How to get the data here? ** The element at given index. * * Indices start at `0`; `xs.a...
how does intellij modify the source code of maven jar packages, what plug-ins or other ways do you use ...
I want to use the multi-field join function of dataframe in java spark-sql. Take a look at this interface. If you want to have multiple fields join, you need to pass in a usingColumns. . public org.apache.spark.sql.DataFrame join(org.apache.spark.sql.Da...
problem description sparksql project, the sql script is placed in the resource sql file below (different businesses, there are a lot of scripts); Local write code to load the sql script using this.getClass.getResource (). GetPath method, get the pa...
topic description Why does the first gender print out null sources of topics and their own ideas I ve tried val gender: String = "male " , but the results don t seem to be right. related codes constructor zhu null derived constructor zhu zz...
1. Json data is now available as follows { "id ": 11, "data ": [{ "package ": "com.browser1 ", "activetime ": 60000}, { "package ": "com.browser6 ", "activetime ": 1205000}, { "package ": "com.browser7 ", "activetime ": 1205000}]} { "id ": 12...
this is the article I refer to. The program that runs according to this article https: blog.csdn.net wangato., as shown in the picture, always reports the error in the first sentence. I Baidu has the reason, but has not been able to solve it. 1. Py...
used sparkSQL to write a UDF, to calculate commission based on performance, but now the demand has changed. The percentage of commission is determined according to position and department. Here s an example spark.udf.register("mmyjtc", (yj: ...
Today, I was working on a machine learning project and encountered a small problem. I want to extract a column of data using the regular expression and then run it and find that there is no name1 data. This symbol is very puzzling for the Great God s ...
use a simple java client to send a message after simulating the configuration of a kafka server, but without message storage, you can only see the error log all the time (the message is really not stored) kafka.common.KafkaException: Wrong request type...
trait Base object A extends Base object B extends Base object C extends Base class D extents Base object Base { TODO trait Base object TODO akka actor event Base } when using akka to throw a Event event, I want to in...
val lines: Dataset[String] = session.read.textFile("") val words: Dataset[String] = lines.flatMap(_.split(" ")) linesdataSetflatMapdataSetIDEAflatMap: def flatMap[U : Encoder](func: T => Traversabl...
override def generateJob(time: Time): Option[Job] = { parent.getOrCompute(time) match { case Some(rdd) => val jobFunc = () => createRDDWithLocalProperties(time, displayInnerRDDOps) { foreachFunc(rdd, time) } ...
how to understand the content of the green part? Why does it feel so awkward? the feeling in the book is also very vague. ...
: class Test{} object Driver extends Test{ } : abstract Fruit{ val name :String val color :String } object Fruit{ object Apple extends Fruit("apple","red") val menu=List(Apple) } question: (1) Why object in scala can al...
when I enable https, to establish a connection for the first time, there must be a tls handshake, so if I open a keep-alive, multiplex connection, do I still need to do a tls handshake every time I reuse a connection? ...
< H2 > description < H2 > first of all, I would like to introduce myself. I am an amateur self-taught front-end and back-end beginner. I have learned some basic knowledge. I want to do something like a front-end gadget. I was baffled by the constructi...
class A { x() { } y() { Object.getPrototypeOf(Object.getPrototypeOf(this)).x.call(this) } } class B extends A { x() { } y() { super.x() } } const b = new B() b.y() I know that the method of the parent class can be ...
first introduce my project logic: 1: there is a button button,open-type on the home page to get the information for getuserinfo, using bindgetuserinfo. Then I save the user s nickname and avatar in setStorage, and get the user s nickname and avatar ...
in some system tools, how does (NotepadPP) use an expression to match the first three strings containing the unordered "I ", "love " and "you " in the following strings: Q I love you b, love 666,777, you 888, you 9991 love 123111l, I am great, you ...