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Jon Chew, once a reporter with The Star, is currently performing in 'The King And I' at London Palladium until September 2018.
Chew Jon Kin, otherwise known as Jon Chew, owner and co-recipe developer of Soul Kitchen KL, tells of his journey in becoming a restaurateur.
A Taste of Home: West End Actor Jon Chew Shares His Malaysian Food Memories | Tatler Asia. The actor, whose theatre credits include The King and I and Anything Goes, misses the mamak stalls.
View Jon Chew’s profile on LinkedIn, a professional community of 1 billion members. Student at National University of Singapore · Experience: NUS Asset & Wealth Management Club ·...
- NUS Asset & Wealth Management Club
- Background
- What Is Idempotency?
- The Problem Statement
- Solution Explained
- Keep Database Commits to A Minimum
- Java Lambdas to The Rescue
- Handling Exceptions — to Retry Or Not to Retry?
- Clients Play A Vital Role
- How to Choose An Idempotency Key?
- Each API Request Has An Expiring Lease
Airbnb has been migrating its infrastructure to a Service Oriented Architecture(“SOA”). SOA offers many upsides, such as enabling developer specialization and the ability to iterate faster. However, it also poses challenges for billing and payments applications because it makes it more difficult to maintain data integrity. An API call to a service ...
For an API request to be idempotent, clients can make the same call repeatedly and the result will be the same. In other words, making multiple identical requests should have the same effect as making a single request. This technique is commonly used in billing and payment systems involving money movement — it is crucial a payments request gets pro...
Guaranteeing eventual consistency for our payments system is of the utmost importance. Idempotency is a desirable mechanism to achieve this in a distributed system. In an SOA world, we will inevitably run into problems. For example, how would clients recover if it failed to consume the response? What if the response was lost or the client timed out...
We wanted to be able to identify each incoming request uniquely. Additionally, we needed to accurately track and manage where a specific request was in its lifecycle. We implemented and utilized “Orpheus”, a general-purpose idempotency library,across multiple payments services. Orpheusis the legendary Greek mythological hero who was able to orchest...
One of the key requirements in an idempotent system is to produce only two outcomes, success or failure, with consistency. Otherwise, deviations in data can lead to hours of investigation and incorrect payments. Because databases offer ACID properties, database transactions can be effectively used to atomically write data while ensuring consistency...
Thankfully, Java lambda expressionscan be used to combine multiple sentences into a single database transaction seamlessly, with no impact to testability and code readability. Here is an example, simplified usage of Orpheus, with Java lambdas in action: At a deeper level, here is a simplified excerpt from the source code: The separation of these co...
With a framework like Orpheus, the server should know when a request is safe to retry and when it isn’t. For this to happen, exceptions should be handled with meticulous intention — they should be categorized as either “retryable” or “non-retryable”. This undoubtedly adds a layer of complexity for developers and could create bad side-effects if the...
As alluded to at the beginning of this post, the client must be smarter in a write repair system. It must own several key responsibilities when interacting with a service that uses an idempotency library like Orpheus: 1. Pass in a unique idempotency key for every new request; reuse the same idempotency key for retries. 2. Persist these idempotency ...
Choosing an idempotency key is crucial — the client can choose either to have request-level idempotency or entity-levelidempotency based on what key to use. This decision to use one over the other would depend on different business use-cases, but request-level idempotency is the most straightforward and common. For request-level idempotency, a rand...
Multiple identical requests can be fired due to multiple user-clicks or if the client has an aggressive retry policy. This could potentially create race conditions on the server or double payments for our community. To avoid these, API calls, with the help of the framework, each need to acquire a database row-level lock on an idempotency key. This ...
- Jon Chew
Apr 16, 2019 · Read writing from Jon Chew on Medium. Engineer @ Airbnb. Every day, Jon Chew and thousands of other voices read, write, and share important stories on Medium.
2,735 Followers, 1,410 Following, 1,117 Posts - Jon Chew (@jonpchew) on Instagram: "Banff, AB @rudeboysshop @banffavebrewing @nixon @capitasupercorp @unionbindingco @coalheadwear @airblaster @spysnowboarding @dc_snowboarding".
