Programmer Help

Catalog 1, Theoretical basis 2, Code test wordCount 1, code 2. Test data 3. Results display 1, Theoretical basis 1. In flow computing, there is usually a need for state computing, that is, the current computing results not only depend on the current received data, but also need to merge the p ...

This article mainly introduces a simple example of using map function to complete Python parallel tasks. Multithreading and multiprocess programming are always hot and difficult issues in Python. Please refer to As we all know, Python's parallel processing ability is not ideal. I think if we don't consi ...

At the last Scala meetup of the lunar year, Liu Ying was inspired to share her professional software development experience. I suddenly realized that I haven't completely followed any standard development specifications. It is true that there will be no strict requirements for standardized operation in the process of technical research and lear ...

I use Java's java.util.Date class in Scala and want to compare the date object with the current time. I know that I can use getTime() to calculate the increment: (new java.util.Date()).getTime() - oldDate.getTime() But that only gave me long milliseconds. Is there a simpler and better way to get time increments? #1 building Simple ...

1, Dependent package configuration The related dependency packages of scala and spark. The number of versions underlined after spark package should be consistent with the first two digits of scala version, that is, 2.11 pom.xml <?xml version="1.0" encoding="UTF-8"?> <project xmlns="http: ...

Catalog Inner class extends override and super override field isInstanceOf and asInstanceOf getClass and classOf Inner class Minnie https://www.amini.net import scala.collection.mutable.ArrayBuffer class Class { class Studen ...

Background introduction Spark is a lightning fast unified analysis engine (Computing Framework) for large-scale data set processing. Spark is doing batch computing of data, and its computing performance is about 10-100 times that of Hadoop MapReduce. Because spark uses advanced DAG based task scheduli ...

11.1 mapping map operation of set elements 11.1.1 look at a real demand Requirement: Please * 2 all elements in List(3,5,7), and return the result in a new collection, that is, return a new List(6,10,14). Please write a program to implement it 11.1.2 using traditional methods to solve //Traditional wri ...

3, Classification and expression Spark.mllib package provides a variety of support tools for binary, multiclassification and regression analysis linear models 1) Mathematical formula Many standard machine learning methods can be expressed as convex optimization problems. For example, the task of fin ...

1, About Kafka manager The project address is: https://github.com/yahoo/kafka-manager In order to simplify the maintenance of Kafka cluster by developers and service engineers, yahoo has built a Web-based tool called Kafka Manager, which is called Kafka Manager. This management tool can easily find out which topics are unevenly distributed in t ...