Key technologiesGuarantees
The vector store said OK. Why can’t search find your upload yet?
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More questions.
Core conceptsMetastable
The 15-second stall ended. Why is the database still serving nobody?
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Networking and APIsMTU black hole
The VPN is up and ssh works. Why does every upload hang?
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Data and storageWrite skew
Two supervisors both see “2 on shift” and sign off. Who’s left?
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Running in productionDeadlines
Why should a service refuse work while it still has 180 ms left?
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Key technologiesExactly-once
Kafka does exactly-once. Why did the customer get the same SMS twice?
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Core conceptsFallbacks
How did a cache failure take down a website and fulfilment centres?
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Networking and APIsHead-of-line
One packet goes missing. Why does every request behind it wait?
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Data and storageLookup vs search
Why can a unit test check order history but never “red cotton kurta”?
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Running in productionStampede
What happens when 300 servers retest a sick service in the same second?
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Key technologiesQuorums
Why is a four-server cluster no safer than three?
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Core conceptsHot keys
The IPL score gets 10% of all requests. Why can’t the ring spread it?
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Networking and APIsRetries
Your payment request timed out. Is it safe to just send it again?
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Data and storageTries
You type “ku” and “kurta” pops up. What did search just read?
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Running in productionThe price
Why pay for 120 slots when 70 would cover the peak?
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Key technologiesHot keys
One ad takes 30% of clicks in an IPL final. Why does everything slow?
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Core conceptsLabels
Is Cassandra AP or CP? Why is that a trick question?
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Networking and APIsBuffering
Why do 64 app workers stall at 40 requests a second on slow phones?
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Data and storageRefresh vs commit
Search already shows your new price. Why can a crash still wipe that segment?
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Running in productionGitLab 2017
GitLab had three kinds of backup. Why did it lose six hours of data?
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Key technologiesLimits
Workflows can sleep for years. Why is a polling loop killed near 8,500 iterations?
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Core conceptsExpect failure
Each server fails once in 30 years. Why does one die every day?
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Networking and APIsAlgorithms
One slow server. Why does round robin make a quarter of users wait?
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Data and storageLeaving Postgres
Postgres search was fine at 50,000 products. What breaks at 5 million?
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Running in productionCapacity
Why must each of three regions run at most two-thirds full?
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Key technologiesChunking
The policy says 45 days. Why did your RAG bot say it doesn’t?
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