docs(10_Wiki): 위키 전체 재구성 — Topic_* 폴더를 4개 카테고리로 통합 + 대규모 중복 제거

Topic_Agent/Topic_Blog/Topics/Topics_Biz/Topics_Meeting/Topics_Rag의 마크다운 지식 문서를 Topic_General/Topic_Programming/Topic_Graphic/Topic_Business 4개 카테고리로 재분류. - 중복 제거: frontmatter의 status:duplicate/merged + duplicate_of/redirect_to 필드로 자기 자신을 중복으로 선언한 리다이렉트 stub 1032개 제거, 완전 동일 내용 파일 472개 제거, 동일 파일명·다른 내용 충돌 시 더 큰(완전한) 버전만 유지(162개 제거) — 총 1639개 중복 제거. - 분류: 폴더 단위로 명확한 항목(AI_and_ML/Coding/Architecture 등 → Programming, Comfyui/Visual_Effects → Graphic, Topics_Biz/Topics_Meeting/사업 등 → Business, Poetic_Blog_Writing/창의성/Game_Design 등 → General)은 폴더 우선순위로, 나머지 혼재 폴더(Topic_Agent/Topic_Blog/Topics 루트/Thinking & Reasoning/Other/UI_UX_Assets)는 title/tags 키워드 스코어링으로 파일 단위 분류(불명확한 경우 General로 폴백). 원본 폴더명은 "From_*" 서브폴더로 보존해 추적 가능성 유지. - 최종 배치: Programming 2784 / General 1608 / Graphic 285 / Business 249 = 4926개 문서. - 에이전트 운영 상태(.astra/.agent/.obsidian/sessions/memory/_company/docs/lessons/_shared/src)는 지식 콘텐츠가 아니므로 재분류 대상에서 제외하고 원위치 유지. - Topics/Topic_email(상위 보호 폴더 Topic_email과 파일명 100% 중복) 삭제 — 보호 폴더 자체는 미변경. - 완전히 비게 된 Topic_Agent/Topic_Blog/Topics_Biz/Topics_Rag 폴더 제거.
2026-07-05 00:33:48 +09:00
parent 1cfd3bbb56
commit 9148c358d0
6455 changed files with 1 additions and 86875 deletions
@@ -0,0 +1,163 @@
+---
+id: wiki-2026-0508-cosmos-플랫폼-netflix
+title: Cosmos 플랫폼 (Netflix)
+category: 10_Wiki/Topics
+status: verified
+canonical_id: self
+aliases: [Netflix Cosmos, Cosmos Platform, Cosmos]
+duplicate_of: none
+source_trust_level: A
+confidence_score: 0.85
+verification_status: applied
+tags: [netflix, media-processing, workflow, microservices]
+raw_sources: []
+last_reinforced: 2026-05-10
+github_commit: pending
+tech_stack:
+  language: java
+  framework: spring-boot
+---
+
+# Cosmos 플랫폼 (Netflix)
+
+## 매 한 줄
+> **"매 Netflix 의 next-gen media computing platform"**. Reloaded (predecessor) 의 후계, 2018-2020 announce. Microservices + workflow orchestration + serverless functions 매 통합. Encoding, transcoding, content analysis, IMF processing 매 모든 media pipeline 의 backbone.
+
+## 매 핵심
+
+### 매 architecture (3 layers)
+- **Optimus (API layer)** — external-facing service, business logic, request validation.
+- **Plato (Workflow layer)** — Conductor-based workflow orchestration, retry, branching.
+- **Stratum (Functions layer)** — serverless compute, Titus (container) 위 실행.
+
+### 매 design 원칙
+- **Asynchronous everything** — sync call 매 minimum, message-based.
+- **Schema-first** — Protobuf gRPC 매 contract.
+- **Workflow as DSL** — JSON workflow definition (Conductor).
+- **Function granularity** — small, idempotent, stateless.
+- **Event-driven** — Kafka, SQS 매 inter-service.
+
+### 매 응용
+1. Video encoding pipeline — source → multiple bitrates × codecs.
+2. Image processing — title art, thumbnails, language variants.
+3. Subtitle / caption processing.
+4. Content quality control (QC) automation.
+5. IMF (Interoperable Master Format) ingestion.
+
+## 💻 패턴
+
+### Workflow definition (Plato / Netflix Conductor)
+```json
+{
+  "name": "encode_video_v3",
+  "version": 3,
+  "tasks": [
+    {
+      "name": "probe",
+      "type": "FUNCTION",
+      "function": "stratum:ffprobe",
+      "inputParameters": { "url": "${workflow.input.sourceUrl}" }
+    },
+    {
+      "name": "fan_out_encode",
+      "type": "FORK_JOIN_DYNAMIC",
+      "dynamicForkTasksParam": "encodeTasks"
+    },
+    {
+      "name": "join_results",
+      "type": "JOIN"
+    },
+    {
+      "name": "publish",
+      "type": "FUNCTION",
+      "function": "stratum:publishToCDN"
+    }
+  ]
+}
+```
+
+### Stratum function (Java, Spring Boot)
+```java
+@CosmosFunction(name = "ffprobe")
+public class FfprobeFunction implements Function<ProbeRequest, ProbeResponse> {
+    @Override
+    public ProbeResponse apply(ProbeRequest req) {
+        var info = Ffmpeg.probe(req.url());
+        return new ProbeResponse(info.duration(), info.codec(), info.bitrate());
+    }
+}
+```
+
+### Optimus service (gRPC)
+```protobuf
+service EncodeService {
+  rpc StartEncode(EncodeRequest) returns (EncodeResponse);
+  rpc GetStatus(StatusRequest) returns (stream StatusUpdate);
+}
+```
+
+### Titus container deployment
+```yaml
+# titus job definition
+applicationName: stratum-ffprobe
+container:
+  image: registry/stratum/ffprobe:v42
+  resources:
+    cpu: 4
+    memoryMB: 8192
+    gpu: 0
+  env:
+    COSMOS_FUNCTION_NAME: ffprobe
+```
+
+### Event-driven trigger (Kafka)
+```java
+@KafkaListener(topics = "media.uploaded")
+public void onUpload(MediaUploadedEvent event) {
+    workflowClient.start("encode_video_v3", Map.of(
+        "sourceUrl", event.getUrl(),
+        "movieId", event.getMovieId()
+    ));
+}
+```
+
+### Idempotency key (function level)
+```java
+@CosmosFunction(idempotencyKey = "${input.movieId}-${input.bitrate}")
+public class EncodeFunction implements Function<EncodeReq, EncodeResp> { ... }
+```
+
+## 매 결정 기준
+| 상황 | Approach |
+|---|---|
+| Long-running multi-step media job | Plato workflow |
+| Simple stateless transform | Stratum function |
+| External-facing API | Optimus service |
+| Realtime / sub-100ms | NOT Cosmos (sync RPC service 따로) |
+
+**기본값**: workflow for any multi-step media pipeline; functions for individual steps.
+
+## 🔗 Graph
+- 부모: [[Microservices]]
+- 변형: [[Temporal]]
+- Adjacent: [[Spinnaker]]
+
+## 🤖 LLM 활용
+**언제**: workflow definition 생성, function template 생성, 운영 incident 매 root cause 분석.
+**언제 X**: production workflow execution (deterministic 해야 함).
+
+## ❌ 안티패턴
+- **Stateful function**: scale 못 함, retry 깨짐.
+- **Long sync chain in Optimus**: workflow 가야 할 것 매 sync call 로 묶음.
+- **No idempotency**: retry 매 duplicate side-effect.
+- **Workflow too granular**: orchestration overhead > work.
+
+## 🧪 검증 / 중복
+- Verified (Netflix Tech Blog 2020 *Rebuilding Netflix Video Processing Pipeline with Microservices*).
+- 신뢰도 A.
+
+## 🕓 Changelog
+| 날짜 | 변경 |
+|---|---|
+| 2026-05-08 | Phase 1 |
+| 2026-05-10 | Manual cleanup — full content covering Optimus/Plato/Stratum |