BigTable

Choosing a database type [closed]

由 瘦欲@ 提交于 2020-01-11 06:07:09
问题 Closed . This question needs to be more focused. It is not currently accepting answers. Want to improve this question? Update the question so it focuses on one problem only by editing this post. Closed 5 months ago . When would you use a bigtabe/simpledb database vs a Relational database? 回答1: Relational databases give you a lot more layout and query flexibility, and are easier to use, but you also end up with more pain if you later need to partition your data if it won't fit on a single

揭秘“撩”大数据的正确姿势：生动示例解说大数据“三驾马车”

由 安稳与你 提交于 2020-01-06 15:25:00
【推荐】2019 Java 开发者跳槽指南.pdf(吐血整理) >>> 我是我：“缘起于美丽，相识于邂逅，厮守到白头！” 众听众：“呃，难道今天是要分享如何作诗？！” 我是我：“大家不要误会，今天主要的分享不是如何作诗，而是《揭秘：‘撩’大数据的正确姿势》，下面进入正题。” 话说当下技术圈的朋友，一起聚个会聊个天，如果不会点大数据的知识，感觉都融入不了圈子，为了以后聚会时让你有聊有料，接下来就跟随我的讲述，一起与大数据混个脸熟吧，不过在“撩”大数据之前，还是先揭秘一下研发这些年我们都经历了啥？ 缘起：应用系统架构的从 0 到 1 揭秘：研发这些年我们都经历了啥？ 大道至简。生活在技术圈里，大家静下来想想，无论一个应用系统多庞大、多复杂，无非也就是由一个漂亮的网站门面 + 一个丑陋的管理模块 + 一个闷头干活的定时任务三大板块组成。 我们负责的应用系统当然也不例外，起初设计的时候三大模块绑在一起（All in one），线上跑一个 Tomcat 轻松就搞定，可谓是像极了一个大泥球。 衍化至繁。由于网站模块、管理平台、定时任务三大模块绑定在一起，开发协作会比较麻烦，时不时会有代码合并冲突出现；线上应用升级时，也会导致其它模块暂时不能使用，例如如果修改了一个定时任务的配置，可能会导致网站、管理平台的服务暂时不能用。面对诸多的不便，就不得不对 All in one 的大泥球系统进行拆解。

parent->child relationships in appengine python (bigtable)

由 左心房为你撑大大i 提交于 2020-01-01 02:44:15
问题 I'm still learning my lessons about data modeling in bigtable/nosql and would appreciate some feedback. Would it be fair to say that I should avoid parent->child relationships in my data modeling if I frequently need to deal with the children in aggregate across parents? As an example, let's say I'm building a blog that will be contributed to by a number of authors, and each other has posts, and each post has tags. So I could potentially set up something like this: class Author(db.Model):

is it possible to share a datastore between multiple GAE applications

由 纵饮孤独 提交于 2019-12-31 01:57:05
问题 I like to work with data saved in one GAE application in other GAE applications. Basically share the datastore between multiple web applications in Google App Engine (Python) Development and Production. Also if possible with: http://localhost:####/_ah/admin/datastore I like to view data in other applications not runnings and/or running on one screen? Thanks for the help! 回答1: Nope, datastores are totally contained within the application. There is no direct sharing of data from one app to

Is BigTable slow or am I dumb?

由 谁都会走 提交于 2019-12-29 11:47:11
问题 I basically have the classic many to many model. A user, an award, and a "many-to-many" table mapping between users and awards. Each user has on the order of 400 awards and each award is given to about 1/2 the users. I want to iterate over all of the user's awards and sum up their points. In SQL it would be a table join between the many-to-many and then walk through each of the rows. On a decent machine with a MySQL instance, 400 rows should not be a big deal at all. On app engine I'm seeing

Join operation with NOSQL

由 梦想的初衷 提交于 2019-12-29 10:28:13
问题 I have gone through some articles regarding Bigtable and NOSQL. It is very interesting that they avoid JOIN operations. As a basic example, let's take Employee and Department table and assume the data is spread across multiple tables / servers. Just want to know, if data is spread across multiple servers, how do we do JOIN or UNION operations? 回答1: When you have extremely large data, you probably want to avoid joins. This is because the overhead of an individual key lookup is relatively large

How to set a future insert date in Google Cloud Bigtable? Trying to calculate it using TTL

由 ＊爱你＆永不变心＊ 提交于 2019-12-25 00:47:06
问题 I have a table with only one column family, this column has a TTL of 172800 SECONDS (2 DAYS), I need some data to be deleted before the deadline. If I want the value to expire in 5mins, I calculate the expiry time and set the insert date to be 5 mins before expiry time. I am using the HBase Client for Java to do this. But the value doesn't seem to expire. Any suggestions on the same? I used cbt to create the table: cbt createtable my_table families=cf1:maxage=2d HColumnDescriptor: {NAME =>

Why does BigTable have column families?

由 邮差的信 提交于 2019-12-21 21:18:25
问题 Why is BigTable structured as a two-level hierarchy of "family:qualifier"? Specifically, why is this enforced rather than just having columns and, say, recommending that users name their qualifiers "vertical:column"? I am interested in whether or not enforcing this enables some engineering optimizations or if this is strictly a design thing. 回答1: There are a couple of advantages to family groups: queries become easier by getting a group of column qualifiers in a single column family Bigtable

bigtable vs cassandra vs simpledb vs dynamo vs couchdb vs hypertable vs riak vs hbase, what do they have in common?

由 我们两清 提交于 2019-12-20 08:43:39
问题 Sorry if this question is somewhat subjective. I am new to 'could store', 'distributed store' or some concepts like this. I really wonder what do they have in common and want to get an overview on all of them. What do I need to prepare if I want to write a product similar to this? 回答1: The NoSQL Database site summarizes the concept like this: Next Generation Databases mostly address some of the points: being non-relational, distributed, open-source and horizontal scalable. The original

bigtable vs cassandra vs simpledb vs dynamo vs couchdb vs hypertable vs riak vs hbase, what do they have in common?

由 被刻印的时光 ゝ 提交于 2019-12-20 08:43:14
问题 Sorry if this question is somewhat subjective. I am new to 'could store', 'distributed store' or some concepts like this. I really wonder what do they have in common and want to get an overview on all of them. What do I need to prepare if I want to write a product similar to this? 回答1: The NoSQL Database site summarizes the concept like this: Next Generation Databases mostly address some of the points: being non-relational, distributed, open-source and horizontal scalable. The original
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