AWS Lambda VS RxJava

• Scalability
  AWS Lambda automatically scales your application by running your code in response to each trigger. This means no manual intervention is required to handle varying levels of traffic.
• Cost-effectiveness
  You only pay for the compute time you consume. Billing is metered in increments of 100 milliseconds and you are not charged when your code is not running.
• Reduced Operations Overhead
  AWS Lambda abstracts the infrastructure management layer, so there is no need to manage or provision servers. This allows you to focus more on writing code for your applications.
• Flexibility
  Supports multiple programming languages such as Python, Node.js, Ruby, Java, Go, and .NET, which allows you to use the language you are most comfortable with.
• Integration with Other AWS Services
  Seamlessly integrates with many other AWS services such as S3, DynamoDB, RDS, SNS, and more, making it versatile and highly functional.
• Automatic Scaling and Load Balancing
  Handles thousands of concurrent requests without managing the scaling yourself, making it suitable for applications requiring high availability and reliability.

Possible disadvantages

• Cold Start Latency
  The first request to a Lambda function after it has been idle for a certain period can take longer to execute. This is referred to as a 'cold start' and can impact performance.
• Resource Limits
  Lambda has defined limits, such as a maximum execution timeout of 15 minutes, memory allocation ranging from 128 MB to 10,240 MB, and temporary storage up to 512 MB.
• Vendor Lock-in
  Using AWS Lambda ties you into the AWS ecosystem, making it difficult to migrate to another cloud provider or an on-premises solution without significant modifications to your application.
• Complexity of Debugging
  Debugging and monitoring distributed, serverless applications can be more complex compared to traditional applications due to the lack of direct access to the underlying infrastructure.
• Cold Start Issues with VPC
  When Lambda functions are configured to access resources within a Virtual Private Cloud (VPC), the cold start latency can be exacerbated due to additional VPC networking overhead.
• Limited Execution Control
  AWS Lambda is designed for stateless, short-running tasks and may not be suitable for long-running processes or tasks requiring complex orchestration.

• Asynchronous Programming
  RxJava provides tools for composing asynchronous and event-based programs using observable sequences, making it easier to manage concurrent tasks.
• Composability
  With RxJava, complex asynchronous workflows can be composed of simpler observable sequences, allowing for modular and reusable code.
• Error Handling
  RxJava offers a wide range of operators and try-catch constructs to manage and respond to errors in a resilient manner.
• Rich Operator Set
  RxJava comes with an extensive set of operators that can be used to filter, transform, and combine observable sequences for powerful data manipulation.
• Backpressure Support
  The library provides the ability to handle backpressure, which helps manage situations where producers of data are faster than consumers.

Possible disadvantages

• Steep Learning Curve
  RxJava introduces a reactive programming paradigm that can be difficult for developers new to this approach to grasp immediately.
• Complexity in Debugging
  The abstract nature of observables and operators can make it challenging to debug ReactiveX code compared to traditional imperative code.
• Verbose Syntax
  Using RxJava often leads to more verbose code with chains of operators, which can decrease code readability if not well-documented.
• Performance Overhead
  RxJava can introduce some performance overhead due to abstraction layers, which might not be suitable for all performance-critical applications.
• Library Size
  For mobile applications, the size of the RxJava library can be a drawback if minimizing application size is a priority.

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Tracking RxJava since Mar 2021.