advantages of queue data structure

Data Structure

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The linear table data structure, corresponding to the Collection of the List interface. In this section, we will do the following three things First. Let's take a look at the characteristics of the linear form Second, their implementation with JA

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Google's engineers to facilitate the use of internal staff MapReduce, Sawzall developed called the DSL, while Hadoop also introduced a similar Sawzall's Pig language, but in the syntax above is quite different. Today, we posted about Sawall gave a

Massive Data Analysis: Sawzall parallel processing (Chinese Paper II)

In some cases, re-initialization is not required. For example, we may create a large array or a mapping table for each record for analysis. Each record in order to avoid making such initialization, Sawzall has a reserved word static to ensure that the var

Summary information on massive data sorting

Reprinted from http://jgzhen125.blog.163.com/blog/static/44508644201091254658679/?fromdm&fromSearch&isFromSearchEngine=yes Question: Suppose a file has 900 million of non-repetition of 9-bit integer, it requires the file to be sorted. General prob

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B / S model's shortcomings (1), the response rate of less than C / S, with the AJAX technology, compared to traditional B / S structure software to double the speed. (2), the user experience are not always effective, B / S require a separate interface

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To see someone else write a large-scale web site design experience, want to have access to such sites. Baidu author from the collection will be referred to as load balancing "is a large-scale Web site to resolve the high-load access and a large numbe

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How to improve website efficiency of a large amount of data query Taken from: http://clglctm.blog.hexun.com/26073206_d.html Abstract : At present, information technology companies are carried out in full swing among companies in the rapidly expanding amou

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Transfer: http://www.cnblogs.com/OnlyXP/archive/2009/10/14/1583450.html System based on hadoop personal summary of the massive data mining of open source solutions. BI system: Pentaho pentaho open source BI systems do count as the best. The core func

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This e-mail system by analyzing the composition of the various parts selection, system architecture analysis and system security settings, a more complete coverage of the entire mail system design process, select or develop the enterprise mail system of r

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Transfer from: http://easthome51905758.blog.163.com/blog/static/3824148320114421112268/ Based on Oracle database technology, data synchronization can be divided into two categories: Oracle to provide their own data synchronization technology and thir

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1. Foreword Linux market is broad, from desktop workstations to low-end server, it is no viable competitor to commercial operating systems. Currently, Linux is fully embedded into the field and high-end server systems, but its technical shortcomings limit

Software development summary

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1. Java language talking about basic study of the basic Java language books, I am sure you will recommend Bruce Eckel's "Thinking in Java". It is written in a very profound technical books, Java language is not some of the basic foundation o

Some companies test pen

Some companies test pen Sony T test 1. Complete the following procedures * *.*. *..*..*.. *...*...*...*... *....*....*....*....*.... *.....*.....*.....*.....*.....*..... *......*......*......*......*......*......*...... *.......*.......*.......*.......*..

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Lucene in Action (Simplified Chinese)

A total of 10 part of the first part of the Lucene core 1. Contact Lucene 2. Index 3. To add a search procedure 4. Analysis of 5. High-pole search technology 6. Extended Search application of the second part of the Lucene 7. Analysis of commonly used docu

Java array with the container class analysis

When reading a problem thinking for java in the array and list what kind of difference? An article on the Internet is to share the next. http://tech.e800.com.cn/articles/2009/98/1252373217457_1.html Array is a Java-built-in types, In addition, Java has a

Lucene: full-text search engine based on Java Introduction

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Java ™ 5.0 for the first time to develop nonblocking algorithms using the Java language is possible, java.util.concurrent bag full advantage of this feature. Nonblocking algorithms are concurrent algorithms, they can safely derive their thread, not derive

Java Common Questions 1

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Reprinted java collections

Help and differences between collections Collection ├ List │ ├ LinkedList │ ├ ArrayList │ └ Vector │ └ Stack └ Set Map ├ Hashtable ├ HashMap └ WeakHashMap Collection Interface Collection is the most basic set of interfaces, a Collection on behalf of a gro

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1, Collection and Map of the structure chart Collection ├-List │ ├ LinkedList │ ├ ArrayList │ └ Vector │ └ Stack │ ├-Queue │ ├ ... ... │ ├ LinkedBlockingQueue │ └ ... ... │ └-Set ├ HashSet ├ TreeSet └ LinkedHashSet Map ├-Hashtable ├-HashMap └-WeakHas ...

Multi-core programming article summary

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Sinatra in the cache is so simple

Ryan Tomayko → Page cache sinatra and the rails of a difference is sinatra default multi-threaded mode. (However, when used in non-thread-safe libraries may also need to open the mutex option, with the single-threaded manner) Engage in multi-threaded mode

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Understanding I / O Completion Port

Welcome to Cipian IOCP tutorial. I will first give a definition and then give it IOCP implementation methods, we analyze an Echo program to uncover the IOCP of the mystery of your cloud, except for the trouble your mind on the IOCP. OK, but I can not guar

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The first set of <br /> 1. Choice 1. The following is a description of the correct ______. A, the efficiency of the algorithm implementation has nothing to do with the data storage structure B, the algorithm is the space complexity algorithm program

Select ARM processor, ARM7 or Cortex-M3?

To use the low-cost 32-bit processors, developers face two choices, based on Cortex-M3 processor core or the ARM7TDMI core. How to choose? What is the selection criteria? This paper introduces the ARM Cortex-M3 ARM7 core microcontroller is different ...

Java rules engine and its API (JSR-94)

Java rules engine and its API (JSR-94) Levels: July 1, 2005 In this paper, Java rules engine and its API (JSR-94) and related implementation to do a more detailed description of its architecture and API applications are more detailed descriptions, an ...

Own some of the problems encountered (random clutter)

create table suntan ( id number (22) not null, name varchar2 (10) not null, num number (6), inseDate timestamp (6) ) Create and delete indexes two methods alter table test add primary key (id); alter table test drop primary key alter table test add constr

JavaScript Array order to use an array

Array The use of 1. Declare the Array of methods (1) var arr = new Array(); //var arr = new Array(20); // By constructor specifies the size of the array : Disadvantages : If the array cannot fill, wasting memory Advantages : If you know the array size ena

ArrayList Vector LinkedList difference and usage

ArrayList and Vector data is stored using an array, the array element number is greater than the actual stored data in order to increase and the insertion element, all elements of the index allows direct number, but to insert the data to design an array o

Basic knowledge of programming languages

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When the difference between Hash and Btree record number is not the primary key for data access, you should use the Hash and Btree algorithm. (If the record number is used for data access in a secondary keyword, or you can choose Btree algorithm, bec ...

Baidu face questions a.zz

Baidu face questions. 1. * Talk about your understanding of the database index R1. Use index for quick access to specific information in the database table. Index is a database table or a column to sort the column values of a structure, such as employee t

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list and linkedlist, arrylist, Vector, Map difference List is an array list with LinkedListList LinkedList is a pointer to the list Select List or LinkedList use depends on your feature. Quick access to an array of linked lists, the complexity of O (1), b

Google Search Engine Principle (change)

This paper, we introduce the google, it is a major search engine (of a large-scale search engine) prototype, the search engine is widely used in the hypertext. Google is designed to efficiently grasp and index page, its search results than other existing

Lucene: Java-based full-text search engine Introduction

Lucene is a Java-based full-text indexing tool kit. Based on Java full-text indexing engine, Lucene Description: About the Author and Lucene history of full-text search of realization: Luene full-text index and database index of more Chinese segmentation

[Change] Design Pattern Notes

Gof Design Patterns Source: http://www.cnblogs.com/furenjun/archive/2010/03/01/designPatterns.html There are 23 commonly used. 1. Design Principles 1.1 OCP rule. Opening and closing law (Open-Closed Principle) A software system should expand opening up of

[Reprinted] Java collection Collection List Set Map difference

Java code package com.suypower.chengyu.collection; import java.util.ArrayList; import java.util.Arrays; import java.util.HashMap; import java.util.HashSet; import java.util.Iterator; import java.util.LinkedHashSet; import java.util.LinkedList; import java

Reprinted-Java-collection.set.list.map

1. Package com.suypower.chengyu.collection; 2. 3. Import java.util.ArrayList; 4. Import java.util.Arrays; 5. Import java.util.HashMap; 6. Import java.util.HashSet; 7. Import java.util.Iterator; 8. Import java.util.LinkedHashSet; 9. Import java.util.Linked

Dijkstra shortest path algorithm to achieve a high efficiency

Dijkstra shortest path algorithm to achieve a high efficiency [Date :2005-02-07] Source: Journal of Wuhan University of Surveying and Mapping: Lok Yang The bi [font: large, medium] Abstract The existing test summary of some shortest path algorithm ba

java Recommended Reading

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Network socket programming guide

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Design model coupled with high cohesion low

1. Concept note This first understanding of a project, a project by a number of subprograms (functions of class to complete) form, while a subroutine is again more modules (various methods) form. This low coupling can be understood the link between the pr

Vector.ArrayList and List the similarities and differences (change)

Linear table, linked list, hash table is a common data structure, making Java development time, JDK has provided us with a series of corresponding classes to implement basic data structures. These classes are in the java.util package. This paper attempts
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