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Everything about Various Big Data Cloudera Certifications
Objective This is comprehensive guide about various Big Data cloudera certifications. In this cloudera certification tutorial we will discuss all the aspects like different certifications offered by...
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Feature wise Comparison between Apache Hadoop vs Spark vs Flink
Objective This Apache Hadoop vs Spark vs Flink comparison tutorialis most comprehensive guide covering feature-wise comparison between Apache Hadoop, Apache Spark and Apache Flink. Learn what is...
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Distributed cache using Redis and ASP.NET Core
What is Redis ? Redis is a super fast non-relational database that uses keys to map to different data types. It is a key value data store (NoSQL) allowing to solve efficiently many different problem...
View ArticleSpring Boot 揭秘与实战（二） 数据存储篇 - MongoDB
本文讲解Spring Boot基础下，如何使用MongoDB，编写数据访问。 环境依赖 修改 POM 文件，添加spring-boot-starter-data-mongodb依赖。 <dependency> <groupId>org.springframework.boot</groupId>...
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Chief Data Officers and the Challenges of Big Data
Writing on the O’Reilly.com site back in August, CEO Jessie Anderson of Smoking Hand, a training company for Big Data technologies, commented on the overall complexity of Big Data, NoSQL technologies,...
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Big data software company Databricks raises $60 million
Databricks , a startup that has pushed the commercialization of the Apache Spark open-source big data software, today is announcing a $60 million funding round. Databricks offers cloud service based...
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Serverles AWS Lambda Retrieve data from AWS DynamoDB
In this pastarticle , we learned how to create our 1st AWS Lambda service through using Serverless framework. Our current Function in the project, currently exposing GET HTTP verb and when it is...
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How-to: Automating Your sparklyr Environment with Cloudera Director
Since the launch of sparklyr , working with Apache Spark in Apache Hadoop has become much easier for R users. sparklyr contains a dplyr interface into Spark and allows users to leverage crucial...
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Retrying Bulk Updates In PouchDB Using A Recursive Promise Chain
Over the weekend, I posted a PouchDB plugin that performs a bulk update operation in PouchDB . This plugin was meant to encapsulate the Get-Modify-Put workflow for updating multiple documents in this...
View ArticleMongodb3.0.5 副本集搭建及spring和java连接副本集配置详细介绍
Mongodb3.0.5 副本集搭建及spring和java连接副本集配置详细介绍一、基本环境：mongdb3.0.5数据库spring-data-MongoDB-1.7.2.jarmongo-Java-driver-3.0.2.jarlinux-redhat6.3tomcat7二、搭建mongodb副本集：1、...
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【MongoDB for Java】Java操作MongoDB数据库
本篇文章主要介绍Java操作MongoDB。开发环境：System：windowsIDE：eclipse、MyEclipse 8Database：mongoDB开发依赖库：JavaEE5、mongo-2.5.3.jar、junit-4.8.2.jar 一、准备工作1、...
View ArticleMongo DB增删改查命令
1 列出并选用1.1 列出所有数据库> show dbs local 0.000GBmyblog 0.000GB1.2 使用某个数据库> use myblogswitched to db myblog1.3 列出所有集合> show collectionsarticlesreplicationColletionsessionsuserswangduanduan2 插入数据...
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MongoDB Windows安装服务方法与注意事项
MongoDB windows安装服务MongoDB作为一个基于分布式文件存储的数据库，近两年大受追捧。数据灵活的存取方式和高效的处理使得它广泛用于互联网应用。最近本人开始在Windows...
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Redis源码剖析--快速列表quicklist
在RedisObject这一篇博客中，有介绍到list结构的底层编码类型有OBJ_ENCODING_QUICKLIST，当时就发现这个底层数据结构被我遗漏了。昨天花了点时间补了补这个知识，看完发现这货就跟STL中的deque的思想一样，顿时觉得又是一个实现超级繁琐但很实用的数据结构。今天就带大家一起来看看这个“二合一”的数据结构。...
View ArticleRedis源码剖析--列表list
上一篇博客 Redis源码剖析 快速列表 带大家一起剖析了quicklist这个底层数据结构的实现原理。Redis对外开放的列表list结构就是采用quicklist作为底层实现（在新版本的Redis源码中，不再采用ziplist和sdlist两种结构，而是统一采用quicklist）。有关列表键的实现源码在t_list.c文件中，大家可以边看源码边看这篇博客，一起来理解。 List概述...
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Siphon: a data extraction library built for scale
Siphon Siphonjs is an easy-to-use data extraction library for Node.js designed to work at scale. Features Intuitive chainable API Fault tolerant with retries and advanced error handling Proxies...
View ArticleSimple Ways to Improve your Health Endpoints
Most of our applications today have a pretty simple health endpoint: That actually just tell if your app is running or not. But if your app is ok, but your databases connections are in a bad shape,...
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Authenticating Node-RED using JSONWebToken - Part 2
In Part 1 of this series , we got a first look at using JSONWebToken in Node-RED by learning how to encrypt and decrypt tokens with the node-red-contrib-auth package. In this article, we'll connect...
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HBase原理－数据读取流程解析
和写流程相比，HBase读数据是一个更加复杂的操作流程，这主要基于两个方面的原因：其一是因为整个HBase存储引擎基于LSM-Like树实现，因此一次范围查询可能会涉及多个分片、多块缓存甚至多个数据存储文件；其二是因为HBase中更新操作以及删除操作实现都很简单，更新操作并没有更新原有数据，而是使用时间戳属性实现了多版本。删除操作也并没有真正删除原有数据，只是插入了一条打上”deleted”标签的数...
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