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Design Job Scheduler[ OK ] 81 — full content available
[ INFO ] category: System Design  difficulty: hard  freq: medium  first seen: 2026-01-12
[HARD][SYSTEM DESIGN][MEDIUM]SchedulingDistributed Systemswebbackendinfrastructuremachine_learningSystem Design
$ cat problem.md
Design a distributed job scheduler that can schedule and execute tasks at specific times.
Requirements:
Schedule one-time and recurring jobs
Guarantee at-least-once execution
Support job priorities
Handle failures and retries
Scale to millions of jobs
Key Components:
Job Submission Service
Job Storage (database)
Scheduler Service (timer)
Worker Pool
Dead Letter Queue
Discussion Points:
Database polling vs message queue
Handling missed jobs (scheduler downtime)
Distributed locking for job assignment
Exactly-once vs at-least-once semantics
Job dependencies (DAG execution)
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