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How Uber Manages a Million Writes Per Second Using Mesos and Cassandra Across...
If you are Uber and you need to store the location data that is sent out every 30 seconds by both driver and rider apps, what do you do? That’s a lot of real-time data that needs to be used in...
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Delivering a Graph Based Search solution to slightly wrong data
When it comes to databases, having good clean data is always important. More so with Graphs which deal with concepts as nodes and their relationships between them. Inevitably, you will run into messy...
View Article常用MongoDB命令
MongoDB与javascript天然的兼容性使得在Node.js下使用MongoDB及其舒服。 我们通常会使用类似 mongoose 的ORM工具来操作MongoDB。 然而手动查看数据库在很多场景下仍然很有用，例如Debug模型间关系，清空用户表，重置数据库。 本文列举了这些常用的 MongoDB 命令。MongoDB文档： https://docs.mongodb.com/ 数据库操作 #...
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What investors need to know about the shift in data science
This coming week, the largest big data conference, O’Reilly Strata event, will gather close to 10,000 attendees in one of NYC’s largest conference hall the Javits Center. I had the pleasure of...
View ArticlexHttpCache 0.1 发布，HTTP高速数据缓存服务
xhttpcache是什么？ xhttpcache 是一个HTTP高速数据缓存服务，也可以做为K-V存储的NOSQL数据库 支持redis协议接口,支持HTTP协议的REST接口; xhttpcache有哪些功能？ 提供HTTP数据缓存服务，支持存储二进制数据; 完整的K-V存储实现, 支持数据持久化存储(ROCKSDB); 支持数据超时机制，提供毫秒级精度。...
View ArticlePart [3/3]: Publish Minio events via Redis
Introduction Minio server supports Amazon S3 compatible bucket event notification for following targets AMQP , Elasticsearch and Redi s. Part 3 of this blog series covers sending bucket notifications...
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Hadoop 集群搭建
目标 在3台服务器上搭建 Hadoop2.7.3 集群，然后测试验证，要能够向 HDFS 上传文件，并成功运行 mapreduce 示例程序 搭建思路 （1）准备基础设施 准备3台服务器，分别命名为 master、slave1、slave2 互相配置为 SSH 免密码登录，并都安装好 JAVA 环境 （2）安装配置 hadoop 在 master 上下载解压 hadoop，修改相应配置文件，包括：...
View ArticleGetting Started with Kubernetes 1.4 using Spring Boot and Couchbase
Kubernetes 1.4 was released earlier this week. Read the blog announcement and CHANGELOG . There are quite a fewnew features in this release but the key ones that I'm excited about are: Install...
View ArticleRiak TS for time series analysis at scale
Until recently,doing time series analysis at scale was expensive and almost exclusively the domain of large enterprises. What made time series a hard andexpensive problem to tackle? Until the advent of...
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Using Merklix tree to checkpoint an UTXO set
In a previous article, I introducedMerklix trees as a way to cryptographically describe an unordered set or map. It is possible to produce proof that an element is contained or absent of the...
View ArticleRedis基数统计――HyperLogLog小内存大用处
我们一直都知道， redis 几大常用数据结构，字符串、散列、列表、集合、有序集合。其实后来Redis做了很多补充，其中之一就是HyperLogLog，另外的还有GEO（地理位置），是3.2版本加的。 这里我们就来简单介绍下HyperLogLog结构。 先说用处：这个结构可以非常省内存的去统计各种计数，比如注册ip数、每日访问IP数、页面实时UV（PV肯定字符串就搞定了）、在线用户数等。...
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anynines ships MongoDB services for Pivotal Cloud Foundry
We are very proud to announce our release of a Pivotal Cloud Foundry data service tile based on open source MongoDB. As Joshua McKenty , senior director of Global Ecosystem Engineering at Pivotal,...
View ArticleMySql存储引擎MyISAM和InnoDB的区别
1、mysql默认采用的是MyISAM。 2、MyISAM不支持事务，而InnoDB支持。InnoDB的AUTOCOMMIT默认是打开的，即每条SQL语句会默认被封装成一个事务，自动提交，这样会影响速度，所以最好是把多条SQL语句显示放在begin和commit之间，组成一个事务去提交。...
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Structr: We Finally Made the Step to Cypher and Neo4j 3.0!
ByChristian Morgner, CTO, Structr | September 29, 2016 Structr is a Silver sponsor of GraphConnect San Francisco . Meet their team on October 13-14th at the Hyatt Regency SF. After months of...
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Cassandra 3.x High Availability, 2nd Edition
出版时间：2016.8 官网链接： Packt 下载地址： 百度网盘(PDF+EPUB+MOBI) 内容简介： Book Description Apache Cassandra is a massively scalable, peer-to-peer database designed for 100 percent uptime, with deployments in the tens of...
View ArticleLog Buffer #489: A Carnival of the Vanities for DBAs
This Log Buffer Edition collects blog posts fromOracle, SQL Server and mysql. Oracle : Over the past 12 months there has been an increase in the number of Machine Learning notebooks becoming available....
View ArticleCouchDB Weekly News, September 29, 2016
Major Discussions CouchDB Next (see thread ) Jan Lehnardt lays out the direction of moving CouchDB forward with specific requests on areas like API, storage, query, etc. CouchDB 2.0 as Snap (see thread...
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redis可视化数据查看工具
Redis是一个超精简的基于内存的键值对数据库(key-value)，一般对并发有一定要求的应用都用其储存session，乃至整个数据库。不过它公自带一个最小化的命令行式的数据库管理 工具 ，有时侯使用起来并不方便。不过Github上面已经有了很多图形化的管理 工具 ，而且都针对REDIS做了一些优化，如自动折叠带schema的key等。 Redis Desktop Manager...
View ArticleOpvizor Performance Analyzer: Part 8 Performance in real time for MongoDB
“Tens of thousands of organizations use MongoDB to build high-performance systems at scale, including over 30 of the world’s 100 largest organizations and many of the world’s most successful and...
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redis配置文件参数说明及命令操作
redis下载地址： https://github.com/MSOpenTech/redis/releases 。 Redis 的配置文件位于 Redis 安装目录下，文件名为redis.windows.conf，以前好像是 redis.conf，不过我下载的版本是 redis.windows.conf，当然你也可以自己创建自己的配置文件，启动redis服务的时候后面跟上配置文件名称就可以了，比如...
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