Design a Distributed Job Scheduler

Functional Requirements

1. Job Submission:

   • Users should be able to submit jobs to the scheduler.
   • Support for different job types (e.g., one-time, recurring).
   • Ability to specify job execution time and frequency.

2. Job Management:

   • Users can view, update, or cancel scheduled jobs.
   • Support for job prioritization.
   • Ability to pause and resume jobs.

3. Job Execution:

   • Execute jobs at the specified time.
   • Support for distributed execution across multiple nodes.
   • Ensure job execution reliability and consistency.

4. Job Monitoring and Logging:

   • Provide real-time status updates for jobs.
   • Log job execution details and history.
   • Alert users on job failures or delays.

5. Scalability:

   • Handle a large number of concurrent job submissions and executions.
   • Support for horizontal scaling to accommodate increased load.

6. Security:

   • Authenticate and authorize users for job submission and management.
   • Ensure data privacy and integrity during job execution.

7. Fault Tolerance:

   • Automatically retry failed jobs.
   • Ensure system availability in case of node failures.

8. API Access:

   • Provide RESTful APIs for job submission, management, and monitoring.

Non-Functional Requirements

1. Performance:

   • Low latency in job scheduling and execution.
   • Efficient resource utilization to minimize execution time.

2. Reliability:

   • High availability with minimal downtime.
   • Ensure job execution even in the event of partial system failures.

3. Scalability:

   • Ability to scale horizontally to support increasing job loads.
   • Efficient load balancing across distributed nodes.

4. Consistency:

   • Ensure data consistency across distributed components.
   • Provide eventual consistency for job status updates.

5. Resilience:

   • System should recover gracefully from failures.
   • Implement redundancy to prevent data loss.

6. Security:

   • Secure communication channels (e.g., HTTPS).
   • Implement role-based access control for job management.

7. Observability:

   • Provide comprehensive logging and monitoring.
   • Enable easy tracking of job execution metrics and system health.

8. Extensibility:

   • Design the system to accommodate future feature additions.
   • Support for plugin-based architecture for custom job types.