大数据Hadoop旗舰公司Cloudera：在中国已有200家代理
Cloudera 云计算工程副总裁 Vikram Makhija 来华的行程之一是拜访中国的电信运营商。 “我们观察到，互联网金融、电信、制造行业都在大规模应用大数据分析平台。” Vikram Makhija 说，“以前这些企业使用传统系统，像 Teradata 和 Oracle 。现在，他们陆续迁移到 Hadoop 大数据平台上。” Hadoop 这种开源大数据技术已经在中国变得非常流行。...
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Scraping a web page in Node with Cheerio
In yet another example of “I will build the most stupid crap ever if bored”, this week I worked on a Node script for the sole purpose of gathering data about SiriusXM. I’m a huge fan of the radio...
View ArticleLogging Queries from MongoDB C# Driver
I searched all over and found only a few out of date examples for setting up the MongoDB driver to log queries and only found small hints in the comments of StackOverflow questions or references to...
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ToroDB's Stampede is now in beta
A few days ago we published a blog post, “The conundrum of BI/aggregate queries on MongoDB” , where we analyzed and measured some performance issues that happen on MongoDB withaggregate/OLAP/DW type...
View ArticleNew Gartner Magic Quadrant for Operational Database Management Systems....
“It is too soon to call the operational DBMS market a commodity market, but it’s easy to see a future where that is the case.” Nick Heudecker. I have interviewed Nick Heudecker , Research Director on...
View ArticleChris Fregly的PANCAKE STACK研讨会及数据流水线
关键点 这种完全密集型、沉浸式的研讨会让参与者可以只用一个全功能的Docker镜像就可以很快地兴奋起来并投入其中了。在研讨会中，参与者在沙盘上就可以直接体验很多整合内容的细节。 Apache...
View ArticleRedis学习笔记四【Redis命令(一)】
本章以及下面几章将介绍一些第一章没有出现过的常用命令，学习这些命令有助于构建更为复杂的应用。 字符串(STRING) 在Redis中字符串可以存储以下三种类型的值： 字节串(byte string) 整数 浮点数 可以通过给定一个任意的数值，对存储这整数或者浮点数的字符串执行自增或者自减操作，下面列举一下相关命令并测试： 命令 描述 INCR 将键存储的值加上1 DECR 将键存储的值减去1...
View ArticleUpdating Inside a Nested Array with the MongoDB Positional Operator in C#
Sometimes you have a document in MongoDB with a property that is an array of nested objects. You’d like to update one of those objects. What’s the best way to go about that in C#? Let’s say you have a...
View ArticleRedis+Node.js缓存使用简介
理解和运用缓存是编写代码一个非常重要的方面，因此 本文将解释什么是缓存，会帮助你如何开始使用Redis的+ Node.js 什么是缓存？ 数据输入输出作为 一个简单的概念，已经存在了相当一段时间，但根据本 Node.js的调查显示 ，许多开发者并不好好利用这个优势。 开发人员认为缓存会使他们的应用程序更复杂 有些事情在开始就没有规划实现 通过本文介绍，我们将看到：...
View ArticleMySQL操作总结（一） MySQL怎么操作 MySQL怎么使用 MySQL 数据库
mysql 操作总结（一）DatabaseCREATE DATABASE databasename; 创建数据库SHOW DATABASES; 显示所有数据库DROP DATABASE databasename; 删除数据库TableCREATE TABLE table-name(Line-nameline-type,…); 新建表DESCRIBE table-name; 查看表定义DROP...
View ArticleMongo DB增删改查命令概要
1 列出并选用 1.1 列出所有数据库 > show dbs local 0.000GB myblog 0.000GB 1.2 使用某个数据库 > use myblog switched to db myblog 1.3 列出所有集合 > show collections articles replicationColletion sessions users...
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Associative Data Modeling Demystified - Part1
Guest blog post by Athanassios Hatzis Relation, Relationship and Association While most players in the IT sector adopted Graph or Document databases and Hadoop based solutions, Hadoop is an enabler of...
View ArticleRedis Users Rejoice! The JCache API Is Here
The JCache API implementation for Redis has been expected by Java community since its publication. Finally, the day has come. TheRedisson team now proudly presents to you our JCache API (JSR-107)...
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Pig Tutorial: Apache Pig Architecture & Twitter Case Study
APACHE PIG TUTORIAL As we mentioned in our Hadoop Ecosytem blog, Apache Pigis an essential part of our Hadoop ecosystem. So now, I would like to take you through the Apache Pig tutorial, which is a...
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We’re Releasing It Live: Neo4j 3.1 GA Launch Event
ByCorie Brickman, Community Programs Manager | December 1, 2016 You already know aboutNeo4j 3.1 from its beta launch at GraphConnect last October. Now the general availability release of Neo4j is less...
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Building The Buffer Link Counting Service
On the surface the Buffer link counting service is pretty simple. It’s job is to keep track of the number of times someone has created a Buffer post with a given url embedded into it. An Example Link...
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Introducing ArangoDB snapcraft.io Packages
ArangoDB Packaging With ArangoDB 3.0 we reworked the build process to be based completely on cmake . The packaging was partly done using cpack (windows, Mac), for the rest regular packaging scripts on...
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Announcing AWS X-Ray See Inside Your Distributed Application
From what I can tell, Presidential Medal of Freedom recipient Grace Hopper was the first person to apply the term debugging to the process of identifying and removing errors from programs. While I...
View ArticleHow long does FileSystem.exists() take against S3?
One thing I've been working on with my colleagues is improving performance of Hadoop, Hive and Spark against S3, one exists() or getFileStatus() call at a time. Why? This is a log of a test run...
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一文掌握云数据库现状与前沿技术
文 | 黄东旭 「一切都会运行在云端」。现在越来越多的业务从自己维护基础设施转移到公有(或者私有)云上， 带来的好处也是无需赘述的，极大降低了 IaaS 层的运维成本，对于数据库层面来说的，以往需要很强的 DBA 背景才能搞定弹性扩容高可用什么的高级动作，现在大多数云服务基本都或多或少提供了类似的服务。...
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