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Ambari――大数据平台的搭建利器
虽然大数据越来越流行，但其学习的门槛却一直阻碍着很多的分布式应用初学者或者大数据的业务应用开发者。多个产品之间的不兼容问题，快速集成和维护也显得比较困难。不管是Hadoop V1 或者 V2 的安装，又或者 Spark/YARN 等的集成，都不是几行简单的命令可以完成的，而是需要手工修改很多的集群配置，这进一步增加了业务开发者的学习和使用难度。有了 Ambari，这些都不再是难题。 Ambari...
View ArticleIntroduction to Couchbase Mobile (Video)
Last week we hosted the first gathering of the Bay Area Android Meetup group to take place on the Peninsula in a while. We had two great speakers, Martin Bonnin and Tony Constantinides. Martin talked...
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MongoDB学习笔记~对集合属性的操作
回到目录 $unset清除元素 请注意在单个数组元素上使用$unset的结果可能与你设想的不一样。其结果只是将元素的值设置为null,而非删除整个元素。要想彻底删除某个数组元素，可以用$pull 和$pop操作符。 $addToSet和$push的区别 该两者的功能都是给数组添加一个值。但是两者之间有区别，$addToSet要添加的值如果不存在才进行添加操作，但是push只添加一个值；例如:...
View ArticleRedis学习笔记十一【使用Redis构建支持程序】
之前学习了如何将Redis用作整个系统的一部分，这一章将来学习写如何使用Redis来构建辅助程序。代码示例位于 redis-sample项目 的support模块中。 日志 使用列表存储最新的日志记录： publicvoidlogRecent(String name, String message, String severity){ final byte[] destination =...
View ArticleHbase葱岭探秘--JavaApi实践
HBase Hadoop Database，是一个高可靠性、高性能、面向列、可伸缩的分布式存储系统，利用HBase技术可在廉价PC Server上搭建起大规模结构化存储集群。 HBase是Google Bigtable的开源实现，类似Google Bigtable利用GFS作为其文件存储系统，HBase利用Hadoop...
View ArticleHadoop Weekly Issue #196
11 December 2016 Lots of great content this week, including two articles showing off the newly released Amazon Athena. Slack has also written about their AWS-based data infrastructure and some of the...
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Introduction to Cascading Style Sheets (CSS)
Open an online editor with direct preview, e.g. http://htmledit.squarefree.com/ . What is CSS? Says who? The W3C maintains the CSS specification and browsers individually choose to comply to the...
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Getting Comfortable with Couchbase Mobile: Installing Couchbase Server
Introduction TheCouchbase Mobilestack comprises three components,Couchbase Server,Sync Gateway, andCouchbase Lite. To get comfortable with the whole stack, it’s great to install and run everything on...
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[Infographic] Comparing Cassandra vs. MongoDB
Our Cassandra vs. MongoDB blog post has been so popular over the last few months we thought we’d make it even easier to consider the pros and cons of choosing one database over another. Below is a...
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Percona Live Featured Tutorial with Giuseppe Maxia ― MySQL Document Store:...
Welcome to a new series of blogs:Percona Live featured tutorial speakers!In these blogs, we’ll highlight some of the tutorial speakersthat will beat this year’s Percona Live conference. We’ll also...
View ArticlePouchdb 6.1.0 发布，最便携的 CouchDB
Pouchdb 6.1.0 发布了，PouchDB 可以让你在浏览器里存储你的本地信息，然后通过 CouchDB 的同步协议将数据与远端服务器的数据进行同步。其目标是构建一个最便携的 CouchDB。 更新内容： 新功能 添加 latest：true 错误修正和性能提升 在复制期间使用 latest：true 更实用的错误提醒插件 content_type 附件缺失提醒 删除...
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Vertex Ventures led a US$4.1 million investment into US-based data analytics...
The platform helps data analysts leave their ‘silo’ by facilitating collaboration across various big data engines Vertex Ventures, a Singaporean Series A-focussed investment firm under Temasek...
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Modeling a Replicated Storage System in TLA+, Project 2
Two weeks ago, I had described phase 1 of the TLA+ project I assigned in my distributed systems class. I promised to give you the solution soon. I put the solution for phase1 on github. In this post,...
View Articleoutfits
./outfits \ data/productMeta.txt.gz \ data/duplicate_list.txt.gz \ data/image_features_Baby.b \ models/Baby-also_viewed-10-0.000000.txt \ data/urlPath_Baby.txt 1. 5 input params: categoryPath,...
View ArticleA simple Perl alternative to storing data in Redis
I continue to be a big user of Perl, and for many of my sites I avoid the use of mysql which means that I largely store data in flat files, SQLite databases, or in memory via Redis . One of my servers...
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RavenDB 4.0 Alpha is out!
For the past two years or so, we have been working very hard on RavenDB 4.0. You have seen some of the posts in this blog detailing some of the work we have been doing. In RavenDB 4.0 we have put a...
View ArticleRedis Highlights (2) Redis中的事件处理
Redis中的事件处理 和mysql不同，Redis是一个 单线程 数据库。所有的读写操作都在主线程里完成。(当然，会有一些操作，例如rdb文件的写操作可以发生在后台线程里) 主线程的循环可以在 ae.c 里看到大致的流程： void aeMain(aeEventLoop *eventLoop) { eventLoop->stop = 0; while...
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5-Minute Interview: Doug Balog, General Manager at IBM Power Systems
ByBryce Merkl Sasaki, Aspiring Graphista | December 16, 2016 “Moore’s Law is dead,”says Doug Balog , General Manager at IBM Power Systems . Due to the constraints of physics, we can no longer expect...
View ArticleRedis module that provides a completely functional SQL database
RediSQL RediSQL is a redis module that embeded SQLite. With great powers comes great responsability (cit. Uncle Ben) Redis is born as a NoSQL database. This same module is already bordeline with the...
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Amadeus turns to NoSQL to answer complex travel questions
Amadeus is using MongoDB as the “Swiss army knife of NoSQL technology”, says Schnapauff. “It is a good fit for when many documents have to be processed to perform a query that is complex. We also use...
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