oximedia-distributed

Production-grade distributed video encoding coordinator for OxiMedia, providing horizontally scalable job distribution across worker nodes with fault tolerance and load balancing.

Part of the oximedia workspace — a comprehensive pure-Rust media processing framework.

Version: 0.1.9 — 2026-07-08 — extensively tested

Overview

oximedia-distributed implements a horizontally scalable distributed encoding coordinator capable of managing tens to hundreds of worker nodes with fault tolerance, Raft-based consensus, and low coordination overhead.

Architecture

┌─────────────────┐
│   Coordinator   │ ◄─── gRPC ───┐
│  (Central Hub)  │              │
└────────┬────────┘              │
         │                       │
    ┌────┴────┐            ┌─────┴──────┐
    │         │            │            │
┌───▼───┐ ┌──▼────┐   ┌───▼───┐   ┌───▼───┐
│Worker │ │Worker │   │Worker │   │Worker │
│  #1   │ │  #2   │   │  #3   │   │  #N   │
└───────┘ └───────┘   └───────┘   └───────┘

Features

Distributed Coordination — Central coordinator managing the worker pool with Raft consensus
Job Scheduling — Priority-based, FIFO, EDF, Fair Share, and SJF policies
Load Balancing — Least-loaded, round-robin, fastest-first, and capability-based strategies
Fault Tolerance — Automatic job rescheduling, heartbeat monitoring, circuit breakers, checkpointing
Worker Discovery — Static, mDNS, etcd, and Consul registration methods
Segmentation — Time-based, tile-based, and GOP-aligned video splitting
Back-pressure — Flow control to prevent coordinator overload
Work Stealing — Idle workers steal tasks from overloaded peers
Leader Election — Raft-based leader election for coordinator HA
Metrics — Real-time throughput, latency, and utilization tracking

Usage

Add to your Cargo.toml:

[dependencies]
oximedia-distributed = "0.1.9"

use oximedia_distributed::{
    DistributedEncoder, DistributedConfig, DistributedJob,
    EncodingParams, SplitStrategy, JobPriority,
};
use std::time::Duration;
use uuid::Uuid;

#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
    let config = DistributedConfig {
        coordinator_addr: "http://127.0.0.1:50051".to_string(),
        max_retries: 3,
        heartbeat_interval: Duration::from_secs(30),
        job_timeout: Duration::from_secs(3600),
        max_concurrent_jobs: 4,
        fault_tolerance: true,
        ..Default::default()
    };

    let encoder = DistributedEncoder::new(config);

    let job = DistributedJob {
        id: Uuid::new_v4(),
        task_id: Uuid::new_v4(),
        source_url: "s3://videos/input.mp4".to_string(),
        codec: "av1".to_string(),
        strategy: SplitStrategy::SegmentBased,
        priority: JobPriority::Normal,
        params: EncodingParams {
            bitrate: Some(5_000_000),
            width: Some(1920),
            height: Some(1080),
            ..Default::default()
        },
        output_url: "s3://videos/output.mp4".to_string(),
        deadline: None,
    };

    let job_id = encoder.submit_job(job).await?;
    println!("Job submitted: {}", job_id);
    Ok(())
}

API Overview

Core types:

DistributedEncoder — Main distributed encoding interface
DistributedConfig — Configuration (coordinator address, timeouts, retries)
DistributedJob — Job definition with source, codec, strategy, and output
EncodingParams — Encoding parameters (bitrate, resolution, preset)
SplitStrategy — SegmentBased / TileBased / GopBased
JobPriority — Low / Normal / High / Critical

Modules:

coordinator — Central coordinator service
worker — Worker node implementation
scheduler — Advanced job scheduling
segment — Video segmentation and reassembly
discovery — Worker discovery (static, mDNS, etcd, Consul)
cluster — Cluster membership management
consensus — Raft-based consensus primitives
raft_primitives — Raft log and state machine
leader_election — Leader election protocol
load_balancer — Load balancing strategies
fault_tolerance — Fault detection and recovery
heartbeat — Worker heartbeat tracking
backpressure — Flow control and back-pressure
work_stealing — Work-stealing scheduler
checkpointing — State checkpointing
replication — State replication
circuit_breaker — Circuit breaker pattern
message_bus, message_queue — Inter-node messaging
node_registry, node_health, node_topology — Node management
task_distribution, task_queue, task_retry — Task lifecycle
task_priority_queue — Priority-ordered task queue
job_tracker — Job progress tracking
resource_quota — Per-job resource limits
partition, shard, shard_map — Data partitioning
snapshot_store — Cluster snapshot persistence
metrics_aggregator — Metrics collection and aggregation
pb — Protocol buffer generated types