Docs(Scheduler Architecture): update documentation of overview of scheduler

docs/2024/scheduler/index.md

@@ -1,31 +1,111 @@
----
-sidebar_position: 1
-title: Introduction
-slug: /2024/scheduler/
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-<!--
-SPDX-License-Identifier: CC-BY-SA-4.0
-
-SPDX-FileCopyrightText: 2024 Aditya Singh <email.here>
--->
-
-## Author
-
-[Aaditya Singh](https://github.com/aadsingh)
-
-## Contact info
-
-- [Email](mailto:email.here)
-- [LinkedIn](https://linkedin.com/in/my-user)
-
-## Project title
-
-Scheduler overhaul
-
-## What's the project about?
-
-Insert Text Here
-
-## What should be done?
-
-What are the plans for the project?
+---
+sidebar_position: 1
+title: Introduction
+slug: /2024/scheduler/
+---
+<!--
+SPDX-License-Identifier: CC-BY-SA-4.0
+
+SPDX-FileCopyrightText: 2024 Aditya Singh <email.here>
+-->
+
+## Author
+
+[Aaditya Singh](https://github.com/Aaditya-Singh78)
+
+## Contact info
+
+- [Email](mailto:singh.aaditya889@gmail.com)
+- [LinkedIn](https://linkedin.com/in/aadi-singh)
+- [Twitter](https://twitter.com/__Aadityasingh)
+
+## Project title
+
+Scheduler overhaul
+
+## What's the project about?
+
+This project aims to enhance the job scheduling capabilities of [FOSSology](https://github.com/fossology/fossology) by transitioning from a C-based implementation to a Go-based system. The overhaul focuses on leveraging Go's modern language features to improve concurrency, performance, and maintainability. This transition addresses the scalability and system *throughput* challenges in the current scheduler.
+
+
+### Architecture Overview
+![C-architecture](./asset/c_arch.jpg)
+
+**The Current architecture** utilises the a multi-threaded approach to manage job scheduling & execution.It is structured around several key *components*:
+
+1. **Main Thread**: Acts as the scheduler's control unit, managing worker threads and overseeing system operations like resource allocation and health monitoring.
+
+2. **Job Execution Queue**: Holds and manages incoming job requests, facilitating efficient job processing and priority control.
+
+3. **Worker Threads**: Executes jobs from the queue under the main thread’s management, optimizing resource use and performance.
+
+4. **Scheduler Logic**: Determines the execution order of jobs based on priority and resource availability, ensuring systematic and efficient processing.
+
+5. **Database Interaction**: Handles storage of job logs and results, supporting tracking, auditing, and data persistence.
+
+6. **Error Handling Mechanism**: Manages job execution errors to ensure stability and prevent system-wide impacts from failures.
+
+7. **Resource Allocation**: Distributes resources across jobs and threads to avoid contention and ensure efficient execution.
+
+**Key Challenges**:
+
+1. *Concurrency and Synchronization*: Ensuring that multiple worker threads operate without interfering with each other requires meticulous management of resources and synchronization.
+
+2. *Efficiency and Throughput*: The system must optimize the processing of jobs to minimize wait times and maximize the throughput of the scheduler.
+
+3. *Scalability*: As the number of jobs increases, the system must scale appropriately to handle the increased load without degradation in performance.
+
+4. *Flexibility*: Adapting to varied job types and changing operational conditions while maintaining performance and reliability.
+
+## What should be done?
+
+What are the plans for the project?
+
+1. **Refactor Existing Code**: Transitioning the existing C codebase to Go, restructuring components to fit the Go idiom.
+
+   > **Why Go?**
+
+    - *Concurrency and Performance*: Go's native goroutine and channel-based concurrency model is highly efficient for processes that require concurrent execution, which is critical for job scheduling.
+
+    - *Memory Safety*: Automatic memory management and garbage collection in Go reduce the risk of memory-related errors, a common challenge in C due to its manual memory handling.
+
+    - *Simplicity and Productivity*: Go's clean and concise syntax, along with its powerful standard library, enables rapid development and easier maintenance compared to the verbose and complex C code.
+
+    - *Robust Tooling*: The Go toolchain provides out-of-the-box support for testing, formatting, and documentation, enhancing development workflow and product quality.
+
+    - *Cross-Platform Compatibility*: Go simplifies the build process with its strong support for cross-platform compilation, making it easier to manage and deploy on various systems without code changes.
+
+2. **Optimize Concurrency Handling**: Implementing a robust concurrency model using goroutines and channels to handle multiple jobs efficiently.
+
+    > **How it would be achieved ?**
+
+    - The *new scheduler architecture* will utilise:
+
+        ![architecture](./asset/golang_arch.png)
+
+        - **Go Routines for Task Management**: Efficiently handling multiple jobs in parallel to optimize resource usage.
+
+        - **Channels for Communication**: Using channels to manage job queues and worker communication, ensuring thread-safe operations.
+
+        - **Modular Design**: Structuring the scheduler with clear separation of concerns, allowing for easier updates and maintenance.
+
+    - To ensure consistency and maintainability of the codebase, the following *coding standards* will be applied:
+
+        - *Format and Style*: using `gofmt` and `golint` for formatting and linting the code.
+
+        - *Error Handling*: Follow Go's idiomatic way of error handling. Always check for errors where they can occur and handle them gracefully.
+
+        - *Commenting and Documentation*: Write clear comments for all public functions and methods, using Godoc conventions. Document all packages and provide examples where necessary.
+
+        - *Concurrency Practices*: Use goroutines and channels appropriately. Avoid common pitfalls like race conditions by using synchronization primitives from the `sync` package when needed.
+
+        - *Testing*: Write comprehensive unit tests for all components using Go's built-in `testing` package. Aim for a high level of test coverage to ensure reliability and facilitate future changes.
+
+3. **Enhance Error Handling**: Utilizing Go's built-in error handling to create a more reliable and fault-tolerant scheduler.
+
+4. **Integrate with Existing Systems**: Ensuring the new Go-based scheduler integrates seamlessly with the current FOSSology ecosystem.
+
+5. **Test and Deploy**: Thoroughly test the new system for performance and reliability before full deployment.
+
+6. **Document the System**: Provide comprehensive documentation to support future development and use of the scheduler.
+