Yaya za ka yanke shawarar lokacin da za a yi refactor da lokacin da za a sake rubuta tsarin daga farko?

Question

Accepted Answer

Default zuwa **refactoring**. Rewrite yana da hujja kawai lokacin da tsarin da ke nan ba zai iya ƙara haɓaka don biyan buƙatu a kan tsada mai karɓuwa ba, kuma za ka iya ci gaba da bayar da daraja yayin da kake yin sa. Yawancin "muna buƙatar rewrite" instincts da gaske matsalar tech-debt ce da ba a sarrafa ba da incremental refactoring ke warwarewa da ƙarancin haɗari sosai.

## Yadda nake tunani game da shi

- **Core architecture har yanzu yana da inganci?** Idan data model, boundaries, da runtime za su iya miƙewa zuwa sabbin buƙatu, refactor. Idan tushen zato ba daidai ba ne (wrong storage paradigm, babu hanyar scale, language/platform end-of-life), rewrite ya zama dan takara na gaske.
- **Menene change frequency?** Code da ba safai ke canzawa ba ba ya buƙatar zama kyakkyawa. Mai da hankali kan inda ƙungiya ke aiki yau da kullum.
- **Mun fahimci ɗabi'ar yanzu?** Rewrite yana jefar da shekaru na ilimin edge-case da aka encode. Idan babu tests da babu spec, rewrite zai sake kawo tsoffin bugs.

## Decision framework

| Sigina | Karkata refactor | Karkata rewrite |
| --- | --- | --- |
| Architecture ya dace da buƙatu | Eh | A'a |
| Test/spec coverage | Ƙarami ko babba | Babba isa don tabbatar da parity |
| Za a iya ship incrementally | Eh | Mai wahala, big-bang |
| Ƙungiya ta fahimci code | Eh | A'a, kuma asalin marubuta sun tafi |

## Trade-offs

- **Refactor:** ƙarancin haɗari, continuous delivery, amma jinkiri akan tushe da gaske ya ruɓe.
- **Rewrite:** clean slate, amma kana biyan **feature-freeze tax**, kana ɗaukar **dual-maintenance cost**, kuma kana haɗarin classic second-system over-engineering trap.
- Fifita **strangler-fig** hanyar tsakiya: tsayar da sabon tsarin kusa da tsohon, route traffic incrementally, share tsohon yanki-yanki. Yana ba da fa'idar rewrite da haɗarin matakin refactor.

## Kuskure

- Rewrite don **kyau ko resume-driven** dalilai, ba tsadar kasuwanci ba.
- Rashin kima da ɓoyayyiyar ɗabi'a; koyaushe characterize ɗabi'ar yanzu da tests da farko.
- Multi-quarter big-bang rewrite da ba ya ship komai — momentum da amana duka sun rushe.

## Me ya sa yake da muhimmanci

Shawarar refactor-vs-rewrite tana ɗaya daga cikin shawarwari mafi ƙarfin lever da Tech Lead ke yi. Ka yi kuskure zuwa rewrite kuma za ka iya daskare delivery na shekara kuma har yanzu ka gaza; ka yi kuskure zuwa refactor kuma za ka zubar da velocity a hankali. Tsara shi a matsayin shawarar tsada-da-haɗari, ba shawarar ɗanɗano ba, shi ne abin da ke raba senior judgment daga zaɓi.

Sigina	Karkata refactor	Karkata rewrite
Architecture ya dace da buƙatu	Eh	A'a
Test/spec coverage	Ƙarami ko babba	Babba isa don tabbatar da parity
Za a iya ship incrementally	Eh	Mai wahala, big-bang
Ƙungiya ta fahimci code	Eh	A'a, kuma asalin marubuta sun tafi