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redis数据类型
Redis 数据类型 Redis支持五种数据类型：string（字符串），hash（哈希），list（列表），set（集合）及zset(sorted set：有序集合)。 String（字符串） string是redis最基本的类型，一个key对应一个value。 string类型是二进制安全的。意思是redis的string可以包含任何数据。比如jpg图片或者序列化的对象 。...
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Aggregated Feeds Demystified
Our team has been hard at work to make aggregated feeds easier to use. This blog post will dive into more detail and help you get your aggregated feeds up and running. If you’re looking for something...
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Vulnerability Spotlight: Redis CONFIG SET client-output-buffer-limit Code...
Vulnerability Discovered by Cory Duplantis of Talos Overview Talos is disclosing TALOS-2016-0206 /CVE-2016-8339, an out-of-bounds write vulnerability in Redis . Redis is a simple in-memory data...
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Using JOINs in MongoDB NoSQL Databases
Thanks toJulian Motz for kindly helping topeer review this article. One of the biggest differences between SQL and NoSQL databases is JOIN. In relational databases, the SQL JOIN clause allows you to...
View ArticleAttivio Adds Value to the Hadoop Ecosystem
As many of our customers move their entire compute environment―including analytics and storage―into the Hortonworks distribution of Hadoop, Attivio has focused on gaining greater integration with...
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[原]大数据道场(HDP SandBox) 初探
这里的大数据道场是以HDP sandbox 为基础的，安装好了virtual box，导入了sandbox镜像之后，启动虚拟机，来看看我们的大数据道场吧。 访问方式 通过SSH的终端访问是不二之选 ssh root@127.0.0.1 -p 2222 输入用户名／密码后就可以进入我们的道场主机了，命令交互与在一台ubantu linux 主机上没什么不同。...
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Introduction To Hadoop Map Reduce
In this Blog we will be reading about Hadoop Map Reduce. As we all know to perform faster processing we needs to process the data in parallel. Thats Hadoop MapReduce Provides us. MapReduce :- MapReduce...
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Lua 与 Redis
Lua 与 Redis 标签: Java与NoSQL 从 2.6版本 起, Redis 开始支持 Lua 脚本 让开发者自己扩展 Redis … 案例-实现访问频率限制: 实现访问者 $ip 在一定的时间 $time 内只能访问 $limit 次. 非脚本实现 private boolean accessLimit(String ip, int limit, int time, Jedis...
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Exploring WikiVoyage data with Neo4j and Cypher: Part 2
Part 2: Intro This is part two of a three part series. In part 1 of this series I wrote about using Elixir to parse Wikivoyage data dumps and push them into Neo4j. If you want to follow along at home...
View Article学习Redis
REmote DIctionary Server(Redis) 是一个由Salvatore Sanfilippo写的key-value存储系统。 Redis是一个开源的使用ANSI C语言编写、遵守BSD协议、支持网络、可基于内存亦可持久化的日志型、Key-Value数据库，并提供多种语言的API。 它通常被称为数据结构服务器，因为值（value）可以是 字符串(String), 哈希(Map),...
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Antirez/neural-redis: Neural networks module for Redis
Neural Redis Machine learning is like highschool sex. Everyone says they do it, nobody really does, and no one knows what it actually is. -- @Mikettownsend . Neural Redis is a Redis loadable module...
View ArticleSleepless nights with MongoDB WiredTiger and our return to MMAPv1
We have been using MongoDB 2.6 with MMAPv1 as the storage engine for the past two years. It’s been a stable component in our system until we upgraded to 3.0 and promoted secondaries configured with...
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Redis学习笔记
Redis是一个key-value存储系统。和Memcached类似，它支持存储的value类型相对更多，包括string(字符串)、list(链表)、set(集合)、zset(sorted set...
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Getting started with Apache Hadoop: The Need
In this Blog we will read about the Hadoop fundamentals. After reading this blog we will be able to understand why we need Apache Hadoop, So lets starts with the problem. Whats the Problem :- The...
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Bitfury支付路由系统Flare经测试成功整合闪电网络，大大减少交易处理时间
Bitfury研发的全新支付路由算法（即 Flare ）已经成功在闪电网络（Lightning Network）中实施，测试阶段由法国初创公司ACINQ负责，目前已经确认完成。 今年7月，Bitfury就这一全新算法发布了一篇白皮书（全文下载），并解释了其运作原理。不久，ACINQ就开始在约2500个AWS节点上测试这一算法。结果表明，在多次测试中，80%的情况下，Flare算法能在 5秒内...
View Articleredis使用场景
不要放冷数据 首先，对于冷数据，无论大小，都不建议放在 Redis 中。Redis 数据要全部放在内存中，资源宝贵，把冷数据放在其中实在是一种浪费，冷数据放在普通的存储比如关系数据库中就好了。 冷数据的例子 1.网站的文章 2.几万年不变的数据 放热数据 尤其是写频繁的热数据，如果量比较小，是最适合放到 Redis 中的。 热数据的例子 1.用户注册数 2.文章阅读量 3.热度排行榜 4.用户订阅量...
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Apache Drill 1.8连接HBASE上的问题处理
使用Apache Drill 1.8版本连接HBASE上的问题，碰到了一个，还是花了一定时间去处理，这里记录一些。 问题描述： Apache Drill 1.8 默认配置下连接HBASE，连接成功，但是执行SQL语句报错。 配置信息 --hbase { "type": "hbase", "config": { "hbase.zookeeper.quorum": "master",...
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Top 10 Books For Mastering NoSQL Databases
The majority of databases rely on relation structures but there are many powerful non-SQL database engines gaining traction. NoSQL is a catch-all term for modern non-relational database models. MongoDB...
View ArticleMark Needham: Neo4j: Procedure call inside a query does not support passing...
A couple of days I was trying to write a Cypher query to filter the labels in my database. I started with the following procedure call to get the list of all the labels: CALL db.labels...
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RocksDB vs InnoDB via Linkbench : performance and efficiency
MyRocks can reduce by half the hardware, or at least the storage hardware, required to run Linkbench compared to InnoDB. That is kind of a big deal. A significant performance problem was recently fixed...
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