Paano ganawar mataki-mataki da sake-sake tare da backoff suna aiki a cikin tsarin rarraba?

Question

IT Interview Practice · Accepted Answer

A cikin tsarin rarraba, kira na iya gazawa. **Sake-sake tare da backoff** sun karbo daga kurakurai na *waje*; **mataki-mataki mataki** yana tokare ka tuka hankalin da gaske *ƙasa*. Suna daidai: sake-sake damje, katse akan laifi.

## Sake-sake tare da backoff na exponential + jitter

Gaban kuskure na waje (timeouts, gajeriyar jituwa ta sadarwa, 503s), sake-sake — amma **sake-sake exponential da kara jitter** saboda sake-sake ta baje maimakon shiryar horo.

```text
attempt 1 → wait ~1s   (+ random jitter)
attempt 2 → wait ~2s   (+ random jitter)
attempt 3 → wait ~4s   (+ random jitter)
→ cap at maxRetries (e.g. 3) and a max delay → don't retry forever
```

Garkawa makili:

- **Sarrafa sake-sake** — sake-sake marasa iyaka ya haifar **arziki na sake-sake** da ke bugi hutun da aka dawo.
- **Idempotency** — gaba kawai aiki da amfani don sake (sake-sake bayarwa dole ba zai jajazzaa sau biyu ba).
- **Jitter** — ba shi, duk abokan iska za su sake a lokaci gida da sake-sake jiya.

## Mataki-mataki mataki

Mataki-mataki mataki yana sattara gazawa zuwa haƙori da, bayan iyaka, **buɗe** — gazawa da sauri (ko kawo da fallback) maimakon kira ga aiki da kufa. Bayan lokaci yana zuwa **rabin-buɗe** don bincika dawo.

```text
CLOSED   → calls pass through; count failures
  too many failures → trip → OPEN
OPEN     → fail fast immediately (no call); start cooldown timer
  cooldown elapsed → HALF-OPEN
HALF-OPEN → allow a few probe calls
  success → CLOSED (recovered) ; failure → back to OPEN
```

## Lokacin kowane aiki

```text
Retry           → transient, likely-to-succeed-soon errors (1 slow call)
Circuit breaker → repeated/sustained failures (the dependency is down)
→ use together: breaker prevents retries from piling onto a dead service
```

## Me yasa yake mahimmi

Ba tare da waɗannan ba, haƙori da kufa yana daukar kira tare dashi: buƙatun suka ƙaru akan timeouts, sake-sake ta ƙaru jiya, da gazawa ta baje akan aiki. Backoff na exponential tare da jitter sun dawo daga damje ba tare da arziki na sake-sake ba; sarrafa da idempotency suka kasance mai amfani; da mataki-mataki mataki yana tsayar da bude albarkatun akan haƙori da kufa da ba shi baidua don dawo. Juna, suna jujjuye kuskure na haƙori zuwa jigar sakandare da aiki.

Sake-sake tare da backoff na exponential + jitter

Mataki-mataki mataki

Lokacin kowane aiki

Me yasa yake mahimmi

Tambayoyi masu alaƙa