Core conceptsStrangler fig
Rewriting the monolith from scratch fails. What grows around it instead?
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More questions.
Networking and APIsThe idea
The band says 100 notes. The machine counts 99. What does the branch do?
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Data and storageQuorums
Why does Elasticsearch need three masters but only two copies of your data?
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Running in productionBad push
How did one regular expression take down Cloudflare for 27 minutes?
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Key technologiesPrefix caching
Every chat shares one system prompt. Why is the prefix-cache hit rate zero?
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Networking and APIsAnatomy of a call
The payments API answered 201 Created. So why hasn’t any money moved?
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Data and storageFan-out
Your search fans out to thousands of index shards. Why isn’t it slow?
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Running in productionDetection time
Why can ALB defaults send 6,500 requests to a dead server?
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Networking and APIsErrors in a 200
The Delivery service is down. Why is your 5xx graph still flat?
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Data and storageRanking funnel
One search for “red kurta”. How do 50 million products become 20?
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Running in productionCells vs shards
Isn’t a cell just a database shard with a fancier name?
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Networking and APIsReconnect storms
Assume a gateway holding 100,000 sockets dies. What happens when they all reconnect?
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Data and storageBuild or buy
GitHub left Elasticsearch; Yelp moved onto it. How can both be right?
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Running in productionSampling
125,000 spans a second, nearly all boring. Which ones do you keep?
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Networking and APIsOne lane each
One shop’s server hangs. Why are everyone else’s webhooks late?
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Data and storageAccess patterns
“Who follows Ravi?” Why does one database scan every document to answer?
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Running in productionFlapping
Scale out at 60%, in at 45%. Why does it never settle?
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Networking and APIsDeep pages
Why does page 5,000 read 100,000 rows to show you 20?
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Data and storagePrimary keys
Why does a random UUID key hurt MySQL far more than PostgreSQL?
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Running in productionFeature flags
Can you ship code to production without releasing it?
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Networking and APIsProtobuf
Someone reused field 4. How did a ₹50 discount become 5,000 points?
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Data and storageCloud-native
Aurora never writes a data page. How does it store anything?
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Running in productionCut-over
How do you move live orders to a new database without stopping checkout?
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Networking and APIsRetries
The booking request timed out. Is it safe to tap Book again?
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Data and storageRow vs column
Same query, same data: why 800 GB in one database, 16 GB in another?
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Running in productionServerless
When does pay-per-request start costing more than two always-on servers?
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