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At-least-once delivery

At-least-once delivery ek messaging / distributed-systems guarantee (concept) hai jiska simple…

Overview
🌟

At-least-once delivery — Quick Facts

📌

Field: Value

🎯

Topic type: Distributed systems / messaging…

Primary guarantee: message will be delivered 1+ times…

🔑

Typical mechanism: retries + acknowledgements (acks)…

Topic 1
📚

Infobox

📚 | Field | Value | |---|---| | Topic type | Distributed systems / messaging semantics…
Topic 2
💡

Overview

💡 At-least-once delivery ka goal reliability hota hai: agar network glitch ho, consumer…
Topic 3
🎯

What does "delivery" mean? (concept)

💡

Delivered: message consumer side…

🔑

Processed: consumer ne message ka…

Topic 4

At-most-once vs at-least-once vs exactly-once (concept)

💡

At-most-once: duplicate nahi…

🔑

At-least-once: message drop hone…

Exactly-once: na drop, na…

Topic 5
📥 ⚙️ 🔬 💡

Why duplicates happen (concept)

🔑 Duplicates usually retries ki wajah se aate hain: 1) Consumer ne message receive kiya 2)…
Topic 6
📥 ⚙️ 🔬 💡

Acknowledgements and retries (concept)

💡

broker message deliver karta

🔑

consumer process karta

consumer ack bhejta

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broker ack ke baad message ko…

Topic 7
🌟

Idempotency and deduplication (concept)

💡

Idempotency: same message ko 2…

🔑

Deduplication: consumer messageId…

payment capture: idempotency key…

🎯

email sending: "sent" log + unique…

Topic 8

Ordering, offsets, and checkpoints (concept)

💡

At-least-once ka focus duplicates…

🔑

Ordering ka focus: messages kis…

Topic 9
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Failure scenarios (concept)

💡

Network partition: ack broker tak…

🔑

Consumer crash: processing mid-way…

Broker restart: in-flight state…

🎯

Slow consumer: timeouts trigger,…

Topic 10
💡

Operational practices (concept)

💡

DLQ (dead-letter queue): poison…

🔑

Retry policy: exponential backoff…

Observability: duplicate rate,…

🎯

Idempotency coverage: critical…

Topic 11

Comparison tables (table)

🎯 | Semantics | Guarantee (concept) | Typical tradeoff | Best for (concept) |…
Topic 12
📥 ⚙️ 🔬 💡

Glossary

💡

Message: data packet/event sent…

🔑

Producer: message publish karne…

Broker/Queue: message…

🎯

Consumer: message receive/process…

Comparison

Comparison tables (table)

⚖️

At-most-once: 0 or 1 delivery

⚖️

At-least-once: 1+ delivery

⚖️

Exactly-once: 1 delivery (ideal)

Diagram
📥 ⚙️ 🔬 💡

Visual Flow

📊 Diagram visualization — details in narration
Related Topics

See Also

📖

At-most-once delivery

🔗

Exactly-once delivery

💡

Message queue

📚

Acknowledgement

🔑

Retry

🌐

Exponential backoff

Quick Quiz
🧠 QUIZ TIME

Quiz — Question 1

At-least-once delivery ka sabse sahi definition kya hai?

Quick Quiz
🧠 QUIZ TIME

Quiz — Question 2

At-least-once delivery ka 'Topic type' kya hai?

Complete! 🎉
COMPLETE

At-least-once delivery Complete!

Aliens Wiki · HIEN · Cinematic Knowledge

At-least-once delivery Complete

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At-most-once delivery

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