# Long-Context Dataset Engineering: NIAH, RULER ve 128K Context FT İçin Veri Hazırlama

> Source: https://sukruyusufkaya.com/learn/fine-tuning-cookbook/ftc-long-context-niah-ruler-128k
> Updated: 2026-08-23T23:25:08.354Z
> Category: Fine-Tuning Cookbook (Model-by-Model)
> Module: Part II — Tokenizer & Data Engineering
**TLDR:** Llama 3.1'in 128K context'ini gerçekten kullanmak: long-context SFT data nasıl üretilir? NIAH (Needle-in-Haystack) synthetic, RULER benchmark üretim reçeteleri, long-form QA dataset, code-repo concatenation, repository-level context. RTX 4090'da long-context QLoRA (128K seq) — packing dahil 22GB peak.