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Hortonworks DataFlow 2.0 Gets a Fresh Face
Hortonworks DataFlow (HDF) 2.0 is now available! HDF is powered by Apache NiFi 1.0.0, which recently underwent a major redesign. Whether you’re a current user or just now planning to try it out, this...
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多机房数万台服务器管理实践
背景 360私有云平台(HULK平台)管理着360公司90%以上的业务线，面对如此众多的服务器，如何进行管理?当然需要一套完善的工具来自动化。HULK 平台的命令系统可以对批量机器执行脚本，命令系统的底层是基于 SaltStack 开发。 当然最大的问题在于机器部署的机房多，机器数量多，部署 SaltStack 的 Master 就会遇到问题，我们使用的是多级多机房 Master 的架构。 多级...
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Hadoop Introduction A Comprehensive Guide for beginners
Objective This tutorial provides thorough introduction of Hadoop. The tutorial covers what is Hadoop, what is the need of Hadoop, why hadoop is most popular, Hadoop Architecture, data flow, Hadoop...
View ArticleConfluent at Strata + Hadoop World NYC 2016
Strata + Hadoop World kicks off in NYC from September 26-29, 2016 and will feature sessions and tutorials on the future of data. Naturally, Confluent will be there with speaking sessions, tutorials,...
View Article理解Go import
Go 的源代码是按 package 方式组织，再通过 import 引入使用。在理解 improt 前有必要来罗嗦下 Go 的代码组织结构 和理解 package。 工作目录 在 Go 中代码保持在称之为 workspace 的系统文件夹中。这个工作目录下有三个根目录： bin 包含可执行文件 。 pkg 包含不同操作系统架构的包二进制文件。相当于编译后的库文件。 src 包含按包方式组织的源代码。...
View ArticleScyllaDB's come to Compose
ScyllaDB hasarrived on Compose and it already looks like it's set to be a favorite with polyglot persistent developers. The wide-column-store is directly compatible with the Java based Apache...
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Check your query and index performance with the Query Targeting Chart
We’re excited to announce a new feature for Monitoring in both Cloud Manager and Atlas: The Query Targeting Chart. This chart tracks two variables, the first is “scanned/returned” and the second is...
View ArticleOwnLocal (YC W10) Is Hiring a Senior DBA in Austin, TX
BECOME OWNLOCAL'S FIRST Senior database administrator About Us OwnLocal is a fun-loving and hardworking Austin-area startup with a crazy plan to help local media companies survive by providing digital...
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Monitoring with InfluxData’s TICK stack
Chronograf’sUI Monitoring with InfluxData’s TICKstack I recently setup InfluxData’s TICK stack to store metrics, visualize, and alert on them. It’s worked pretty swell for the past few months so in...
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BoltDB之Bucket(二)
我们在前面的博客中详细描述了BoltDB的Bucket存储格式以及针对Bucket的一些关键动作。但在前讲我们关注的重点是Inline Bucket，也即Bucket内所有的KV记录都紧随Bucket的记录而存放，这样可以提高Bucket的搜寻效率。 但随着数据量的增长，一个Bucket无法永远保存Inline的特性，总会在某个点的时候，Inline Bucket终究还是要成为非Inline...
View ArticleTwo elephants: Hortonworks and IBM
I have a two-year-old son at home. Wait, no ― he’s almost three. Wow, that happened FAST. Anyway, I have a young son, and one of the rituals we both look forward to every night is story time. We have...
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《数据库系统概论》---第二章关系数据库
一、概述 1.关系模型的组成 数据结构：二维表(关系)，数据库中全部数据以及数据间的联系都以关系来表示。 数据操作：增、删、改、查 数据的约束条件：实体完整性，参照完整性，用户自定义的完整性。 2.关系的数据结构 域 ·是一组既有相同数据类的值的集合，又称值域。 ·域中所包含值的个数称为域的基数。 笛卡尔积 ·所有域的所有取值的一个组合;不能重复 ·笛卡尔积的表示方法 笛卡尔积可表示为一个二维表...
View ArticleQL之-建库、建表、建约束、关系SQL基本语句
SQL之-建库、建表、建约束、关系SQL基本语句大全.txt举得起放得下叫举重，举得起放不下叫负重。头要有勇气，抬头要有底气。学习要加，骄傲要减，机会要乘，懒惰要除。人生三难题：思，相思，单相思。 SQL之-建库、建表、建约束、关系、部分T-sql语句 --建库 if exists(select * from sys.sysdatabases where name='wf') begin use...
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explain详解
explain显示了mysql如何使用索引来处理select语句以及连接表。可以帮助选择更好的索引和写出更优化的查询语句。 先解析一条sql语句，看出现什么内容 EXPLAINSELECTs.uid,s.username,s.name,f.email,f.mobile,f.phone,f.postalcode,f.address FROM uchome_space...
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数据库知识体系+sql语句实现存储过程和函数+应用程序接口
按存储模型分为：关系次数据库、网络次数据库、层次数据库。不同的数据库的是按不同的数据结构组织和联系的 数据结构：数据的组织形式与数据之间的联系 用ds=(D, R)其中D表示数据，R表示数据间的联系。 数据结构类型：数据结构类型分为数据的逻辑结构和数据的物理结构 逻辑结构：以数据的组织形式和联系方式，来观察数据与分析数据，不考虑存储位置 物理结构：数据在计算机存储结构 管理技术发展历程： 顺序存取...
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Operational nightmare fun: dealing with misconfigured Riak Clusters
2016-09-21 by Viktoria Fordos and Csaba Hoch Everyone has a strong opinion about DevOps. Either you love it, or you hate it. Personally, we believe in DevOps. In the Erlang world, we were doing DevOps...
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How to store data locally in an Android app
Virtually every non-trivial application will have to store data in one way or another. This data can be of different forms, such as user settings, application settings, user data, images, or a cache of...
View ArticleMongoDB 3 array query operations
MongoDB 3 array query operations are very helpful and simplify digging in nested structures. In this post we’ll show how to create queries that match array elements in various ways. Test collection...
View ArticleBig Data Sandbox aims to kick off Hadoop testing
For businesses struggling to find a big data use case that they feel they should invest in Talend has an answer, a Big Data Sandbox. The cloud and big data integration software company wants to provide...
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