Hadoop 2.7.3 configures multiple namenodes (federation clusters) in the cluster

http://blog.csdn.net/wild46cat/article/details/53423472 Hadoop 2.7.3 configures multiple namenodes (federation clusters) in the cluster First of all, configuring multiple namenodes in a cluster and using secondary Namenode in a cluster are two completely different things. I will write an official translation of haoop later, explaining the ...

Added by Grunge on Tue, 21 May 2019 21:37:27 +0300

Summary of Common Problems in Java Programming (1)

String connection misuse Wrong Writing: String s = ""; for (Person p : persons) { s += ", " + p.getName(); } s = s.substring(2); //remove first comma Correct writing: StringBuilder sb = new StringBuilder(persons.size() * 16); // well estimated buffer for (Person p : persons) { if (sb.length() > 0) sb.append(", "); sb.app ...

Added by kazil on Mon, 20 May 2019 05:53:56 +0300

Some common methods of arrays and summary of operations during normal work

In normal work, it is necessary to use arrays. Sometimes the data returned from the back end will be re-rendered by the back end if it is not the data front end that conforms to the dom tree rendering or by itself.Say nothing more. Let's first look at the methods contained in the arrays. Perhaps they are not complete enough. Please add some ina ...

Added by robogenus on Mon, 20 May 2019 04:33:32 +0300

Chapter 2 of python Foundation

Chapter 2 of Python Foundation Binary system Character encoding Basic Data Type - Number Basic Data Type - String Basic Data Type - List Basic data type - tuples Variable, immutable data types and hash Basic Data Type - Dictionary Basic Data Type - Set Binary system Binary system is a kind of system used in computing technology. The binary ...

Added by Cornelia on Mon, 20 May 2019 04:30:59 +0300

Using Recycler View to Realize the Function of Discovering Brands

Exploratory Brand Turnover Modeled after Need foundation Basic use of RecyclerView Look at the gods of hong: Android RecyclerView uses fully analytical experiential art-like controls Customize Layout Manager You can see: Create your Layout Manager Use of ItemTouchHelper and Implementation of Callback You can see: ...

Added by sonoton345 on Mon, 20 May 2019 03:52:59 +0300

Orleans Initial Contact (1) Introduction Example

 [Return navigation] After a brief understanding of Orleans, we can use several examples to deepen our impression. I. An Introduction to Orleans This example follows Orleans Initial Examples. https://www.cnblogs.com/gaopang/articles/7379802.html) 1. Create First create a solution for four projects, as shown in the figure    The four projects ...

Added by PunkGo on Sun, 19 May 2019 13:59:18 +0300

Java Web Base Disk - Other Articles

XML Operation of XML Files Conversion between XML and JavaBean 1. File operation 1)Create an empty XmlDoc XmlDoc doc = new XmlDoc(); 2)Use the external input element as the root element Element element = ... XmlDoc doc = new XmlDoc(element); 3)With the specified external file or xml Text string c ...

Added by bben95 on Sun, 19 May 2019 10:57:29 +0300

Android Simple Application--Chatting Demo with Turing Robot

Turing Robot Chat Demo Based on the idea of exploring and sharing technology, and taking this opportunity to record their growth, this small Android Demo came into being. This is my first time to write a blog, let alone a technical blog. If there is anything wrong with it, welcome to point out, thank you. Here's a bri ...

Added by naitsir on Sat, 18 May 2019 19:58:10 +0300

java reads files in many ways

java reads files in many ways This paper introduces several ways of reading files from classpath, url and jar in java. Get ready We use only java classes to implement a set of test examples, in which we use the Hamcrest tool for matching validation. Test class sharing uses readFromInputStream method to transfer input stre ...

Added by dynamicallystatic on Sat, 18 May 2019 15:34:19 +0300

Android Custom ViewGroup Artifact-ViewDragHelper

1. Overview ViewDragHelper is a utility class for writing custom ViewGroups. It offers a number of useful operations and state tracking for allowing a user to drag and reposition views within their parent ViewGroup. This is the official explanation: ViewDragHelper can be used to drag and set the position of a child View (within the ViewGroup ...

Added by mw-dnb on Sat, 18 May 2019 07:59:49 +0300