A cookbook to deal with throttling issues in Amazon DynamoDB

According to Amazon DynamoDB documentation, it is a fully managed NoSQL database service that provides fast and predictable performance with seamless scalability. DynamoDB lets us offload the administrative burdens of operating and scaling a distributed database so that we don’t have to worry about hardware provisioning, setup and configuration, replication, software patching, or cluster scaling.

DynamoDB also offers encryption at rest, which eliminates the operational burden and complexity involved in protecting sensitive data.

In a DynamoDB table, items are stored across many partitions according to each item’s partition key. Each partition has a share of the table’s provisioned RCU (read capacity units) and WCU (write capacity units).

When a request is made, it is routed to the correct partition for its data, and that partition’s capacity is used to determine if the request is allowed, or will be throttled (rejected). Some amount of throttling should be expected and handled by the application.

Excessive throttling is caused by:

_Hot partitions: throttles are caused by a few partitions in the table that receive more requests than the average partition_

_Not enough capacity: throttles are caused by the table itself not having enough capacity to service requests on many partitions._

Impact of write throttle — We might end-up missing out events which could lead to cascading failure in downstream systems.

Impact of read throttle — We might end-up processing double/duplicate events if the previously processed record could not be retrieved.

Amazon DynamoDB is a NoSQL cloud database service that is designed to provide low-latency and high-throughput performance for applications and services running at scale. Example use cases include:

• Massively multiplayer online games (MMOGs)
• Virtual and augmented reality
• Checkout and order processing in e-commerce
• Real-time stock pricing and trading

#aws #dynamodb #nosql #throttling #technology #amazon

What is GEEK

Buddha Community

A cookbook to deal with throttling issues in Amazon DynamoDB

According to Amazon DynamoDB documentation, it is a fully managed NoSQL database service that provides fast and predictable performance with seamless scalability. DynamoDB lets us offload the administrative burdens of operating and scaling a distributed database so that we don’t have to worry about hardware provisioning, setup and configuration, replication, software patching, or cluster scaling.

DynamoDB also offers encryption at rest, which eliminates the operational burden and complexity involved in protecting sensitive data.

In a DynamoDB table, items are stored across many partitions according to each item’s partition key. Each partition has a share of the table’s provisioned RCU (read capacity units) and WCU (write capacity units).

When a request is made, it is routed to the correct partition for its data, and that partition’s capacity is used to determine if the request is allowed, or will be throttled (rejected). Some amount of throttling should be expected and handled by the application.

Excessive throttling is caused by:

_Hot partitions: throttles are caused by a few partitions in the table that receive more requests than the average partition_

_Not enough capacity: throttles are caused by the table itself not having enough capacity to service requests on many partitions._

Impact of write throttle — We might end-up missing out events which could lead to cascading failure in downstream systems.

Impact of read throttle — We might end-up processing double/duplicate events if the previously processed record could not be retrieved.

Amazon DynamoDB is a NoSQL cloud database service that is designed to provide low-latency and high-throughput performance for applications and services running at scale. Example use cases include:

• Massively multiplayer online games (MMOGs)
• Virtual and augmented reality
• Checkout and order processing in e-commerce
• Real-time stock pricing and trading

#aws #dynamodb #nosql #throttling #technology #amazon

Spring: A Static Web Site Generator Written By GitHub Issues

Spring

Spring is a blog engine written by GitHub Issues, or is a simple, static web site generator. No more server and database, you can setup it in free hosting with GitHub Pages as a repository, then post the blogs in the repository Issues.

You can add some labels in your repository Issues as the blog category, and create Issues for writing blog content through Markdown.

Spring has responsive templates, looking good on mobile, tablet, and desktop.Gracefully degrading in older browsers. Compatible with Internet Explorer 10+ and all modern browsers.

Get up and running in seconds.

中文介绍

Quick start guide

For the impatient, here's how to get a Spring blog site up and running.

First of all

• Fork the Spring repository as yours.
• Goto your repository settings page to rename Repository Name.
• Hosted directly on GitHub Pages from your project repository, you can take it as User or organization site or Project site(create a gh-pages branch).
• Also, you can set up a custom domain with Pages.

Secondly

• Open the index.html file to edit the config variables with yours below.

$.extend(spring.config, {
  // my blog title
  title: 'Spring',
  // my blog description
  desc: "A blog engine written by github issues [Fork me on GitHub](https://github.com/zhaoda/spring)",
  // my github username
  owner: 'zhaoda',
  // creator's username
  creator: 'zhaoda',
  // the repository name on github for writting issues
  repo: 'spring',
  // custom page
  pages: [
  ]
})

• Put your domain into the CNAME file if you have.
• Commit your change and push it.

And then

• Goto your repository settings page to turn on the Issues feature.
• Browser this repository's issues page, like this https://github.com/your-username/your-repo-name/issues?state=open.
• Click the New Issue button to just write some content as a new one blog.

Finally

• Browser this repository's GitHub Pages url, like this http://your-username.github.io/your-repo-name, you will see your Spring blog, have a test.
• And you're done!

Custom development

Installation

• You will need a web server installed on your system, for example, Nginx, Apache etc.
• Configure your spring project to your local web server directory.
• Run and browser it, like http://localhost/spring/dev.html .
• dev.html is used to develop, index.html is used to runtime.

Folder Structure

spring/
├── css/
|    ├── boot.less  #import other less files
|    ├── github.less  #github highlight style
|    ├── home.less  #home page style
|    ├── issuelist.less #issue list widget style
|    ├── issues.less #issues page style
|    ├── labels.less #labels page style
|    ├── main.less #commo style
|    ├── markdown.less #markdown format style
|    ├── menu.less #menu panel style
|    ├── normalize.less #normalize style
|    ├── pull2refresh.less #pull2refresh widget style
|    └── side.html  #side panel style
├── dist/
|    ├── main.min.css  #css for runtime
|    └── main.min.js  #js for runtime
├── img/  #some icon, startup images
├── js/
|    ├── lib/  #some js librarys need to use
|    ├── boot.js  #boot
|    ├── home.js  #home page
|    ├── issuelist.js #issue list widget
|    ├── issues.js #issues page
|    ├── labels.js #labels page
|    ├── menu.js #menu panel
|    ├── pull2refresh.less #pull2refresh widget
|    └── side.html  #side panel
├── css/
|    ├── boot.less  #import other less files
|    ├── github.less  #github highlight style
|    ├── home.less  #home page style
|    ├── issuelist.less #issue list widget style
|    ├── issues.less #issues page style
|    ├── labels.less #labels page style
|    ├── main.less #commo style
|    ├── markdown.less #markdown format style
|    ├── menu.less #menu panel style
|    ├── normalize.less #normalize style
|    ├── pull2refresh.less #pull2refresh widget style
|    └── side.html  #side panel style
├── dev.html #used to develop
├── favicon.ico #website icon
├── Gruntfile.js #Grunt task config
├── index.html #used to runtime
└── package.json  #nodejs install config

Customization

• Browser http://localhost/spring/dev.html, enter the development mode.
• Changes you want to modify the source code, like css, js etc.
• Refresh dev.html view change.

Building

• You will need Node.js installed on your system.
• Installation package.

bash

$ npm install

*   Run grunt task.

    ```bash
$ grunt

• Browser http://localhost/spring/index.html, enter the runtime mode.
• If there is no problem, commit and push the code.
• Don't forget to merge master branch into gh-pages branch if you have.
• And you're done! Good luck!

Report a bug

• Check if the bug is already fixed in the master branch since the last release.
• Check existing issues.
• Open a new one, including exact browser & platform information.

Who used

• http://zhaoda.net/spring
• http://zhaoda.net/blog

If you are using, please tell me.

Download Details:
Author: zhaoda
Source Code: https://github.com/zhaoda/spring
License: MIT License

#spring #spring-framework #spring-boot #java 

Batch Processing Example using Amazon Data Pipeline | S3 to DynamoDB using Amazon EMR

This video covers a hands-on example in setting up Batch Processing example using Amazon Data Pipeline which leverages S3 and DynamoDB along with Amazon EMR.
The following is the agenda for the video:

⏱ Chapter Timestamps

0:00 - Introduction
00:28 - Architecture Flow
2:31 - Pre-requisite: Amazon S3 Buckets Creation
3:44 - Pre-requisite: Amazon DynamoDB Table Creation
5:15 - Pre-requisite: Amazon S3 file format Creation
8:20 - Pre-requisite: Amazon Data Pipeline Creation
12:40 - Data Format Configuration in Data Pipeline
14:14 - Activate Data Pipeline
17:52 - Data Loaded into DynamoDB
19:03 - Serverless Data Pipeline Trigger using EventBridge and Lambda
20:06 - Summary

📌 Links

🔗 Amazon Data Pipeline: https://aws.amazon.com/datapipeline/

📌 Related Videos

🔗AWS Primer: https://www.youtube.com/playlist?list=PLTyWtrsGknYdyi0JR7c1wsuv-Plrwrzqj
🔗 System Design Primer: https://www.youtube.com/playlist?list=PLTyWtrsGknYeX_wV9ysDuuAxvxfSBfVSI
🔗 Containers Primer: https://www.youtube.com/watch?v=yo2g_CZZWL4&list=PLTyWtrsGknYf_Oee7YOvom5Ev0F3-E2zB
🔗 Kubernetes Primer: https://www.youtube.com/playlist?list=PLTyWtrsGknYfanKF33E12LdJvl5q5PZGp

💥 Join TechPrimers Slack Community: https://bit.ly/JoinTechPrimers
💥 Telegram: https://t.me/TechPrimers
💥 TechPrimer HindSight (Blog): https://medium.com/TechPrimers
💥 Website: http://techprimers.com
💥 Slack Community: https://techprimers.slack.com
💥 Twitter: https://twitter.com/TechPrimers
💥 Facebook: http://fb.me/TechPrimers
💥 GitHub: https://github.com/TechPrimers or https://techprimers.github.io/

🎬Video Editing: FCP

---

🔥 Disclaimer/Policy:
The content/views/opinions posted here are solely mine and the code samples created by me are open sourced.
You are free to use the code samples in Github after forking and you can modify it for your own use.
All the videos posted here are copyrighted. You cannot re-distribute videos on this channel in other channels or platforms.
#AmazonDataPipeline #AmazonEMR #TechPrimers

#amazon data pipeline #batch processing example #amazon #dynamodb #amazon emr

Amazon Pay Clone, Amazon Pay Clone Script, Recharge & Wallet App Solution

Mobile wallet applications have become the new trend in today’s world. Apps like Amazon Pay, Paytm, PayPal are some of the leading apps that are owned and used by millions. Be it paying bills, recharging, or money transactions, everything has turned easier because of these apps. There were days when people used to travel for hours to do these tasks have been totally transformed. Moreover, consumers can use these e-wallet apps while paying in a store, either for shopping or while eating out. Thus, as far as mobile wallets are concerned, they are a convenient way for handling all the tasks involving finance.

As an aspiring entrepreneur, if you wish to succeed in your business, without second thoughts, go for Amazon Pay clone app development. Let’s narrow down your thinking processes for a quicker stride forward by analyzing the types of apps first.

Types of e-wallet apps you could develop:

Retail application: An app like Amazon is considered the retail app because it has a mobile wallet in it. It has all the basic functionalities, which helps users to redeem coupons and reward points. All the payment modes are accessible through the app, including net banking.

Dedicated app: The app allows P2P money transactions by storing a variety of cards. You could also make international money transfers using this app. Example: PayPal, Apple Pay, and Amazon Pay.

PoS payments: The PoS payment wallet apps are found at the stores. It is exclusively used by the users to make contactless payments without having to stand in a long queue.

Wrapping up,
Choose the best type of e-wallet app you want to develop and join forces with our Appdupe. Grab the cutting-edge Amazon Pay Clone script and launch an app in a week!

##amazon pay clone ##amazon pay clone script ##amazon pay clone app ##amazon pay clone app development ##amazon pay app clone ##amazon pay app clone development

Empower your e-commerce business by building an app like Amazon

We at Appdupe incorporate the app with the latest techniques to meet the customer market trend. The app is enriched with the highly-advanced and innovative features that help you deliver the best Amazon clone script that helps turn your e-commerce business ideas into reality. We offer a top-notch Amazon clone app development and a ready-made clone application perfect for any business sector. Every feature in it is set to expand your business, which can also be altered with your brand name. By developing an app like Amazon, you can easily reach your customer anytime anywhere that eventually helps increase the business revenue.

Read More, https://www.appdupe.com/amazon-clone

#amazon clone #amazon clone app #amazon clone app development #amazon clone script #amazon app clone #amazon like app development