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@cops.police4: Dashcam recorded a manhunt. The initial problem may be that this person is driving in the wrong lane and encroaching #cops #copsoftiktok #copstiktok #fyp #foryou

cops.police4
cops.police4
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Saturday 04 November 2023 12:31:52 GMT
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Ha g 🫀💯✌️@이사 🚩 #1millionaudition #aesthetic #foryou #forupage #poetrystatus
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NOS QUIERE VENDER.😡
NOS QUIERE VENDER.😡


#code #programming #computer #job #fyp
#code #programming #computer #job #fyp
One post. Eighteen moving parts. This is what actually happens when you tap
One post. Eighteen moving parts. This is what actually happens when you tap "Share." 🌐 GETTING IN Client hits DNS to find the nearest edge. Static content — photos, JS, video — comes straight off the CDN and never touches your servers. Everything else goes to a load balancer, then through API gateways. Then a SECOND load balancer, and this one matters: it splits traffic into APP READ servers and APP WRITE servers. Different machines. Different scaling. Reads outnumber writes 100 to 1, so they cannot share a box. ✍️ THE WRITE SIDE Write server drops jobs onto queues instead of doing them inline. Video goes to the video queue → processing service → a pool of workers. The post goes to the feed gen queue → Feed Generation Service. Nothing slow happens while the user is waiting. That's the whole reason queues exist here. 👀 THE READ SIDE Read server hits CACHE first, always. Cache miss → Metadata/User DB, which is sharded: a Shard Manager and directory-based partitioning decide which box holds which user. Master takes writes, slaves serve reads. Search is its own path entirely — aggregator → search index with its own caches. You do not run text search against your primary database. 🔔 THE LOOPS Feed Generation writes back to the DB and fires the notification queue. Those two red lines wrapping the diagram are the async tails — the work that finishes after you've already seen "Posted." THE RULE: split reads from writes. Then shard. The failure mode: one app server doing both. It works at 10k users and falls over at 10 million, because your read traffic and your write traffic need opposite things — caching versus consistency. 📸 Screenshot this before your next system design interview. Follow @hackproduct ⚡ . . #systemdesign #systemdesigninterview #softwareengineering #facebook #backenddevelopment

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