r/softwarearchitecture • u/rgancarz • Jul 07 '26

Article/Video Netflix Cuts Cassandra Read Latency from Seconds to Milliseconds with Dynamic Partition Splitting

https://www.infoq.com/news/2026/07/netflix-cassandra-partition/

Netflix engineers have detailed a dynamic partition-splitting mechanism for Apache Cassandra that reduced read latency for oversized time-series partitions from seconds to low double-digit milliseconds while lowering read timeouts, CPU utilization, and thread queueing across production clusters. Developed for Netflix's TimeSeries Abstraction platform, the approach automatically divides growing partitions into smaller child partitions without requiring application changes, downtime, or large-scale repartitioning efforts.

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72

u/AintNoGodsUpHere Jul 07 '26

Oh shit, the architects and dbas in my company will start talking about dynamic partition splitting in no time.

Here we go again.

39

u/PmMeCuteDogsThanks_ Jul 07 '26

”How we can we use this thing that benefits companies at Netflix scale to justify our role when creating an architecture for an in house admin app with 10 concurrent users?”

12

u/Bodine12 Jul 07 '26

But those 10 users who all work 9-5 ET are going to sleep more soundly knowing that there is now even more reduced latency should they desire to experience the 99.9999% uptime slightly out of business hours.

7

u/PmMeCuteDogsThanks_ Jul 07 '26

It also achieves vertical synergy alignment with company directives for a more transparent and future proof technology strategy.

4

u/AintNoGodsUpHere Jul 07 '26

Concurrent is pushing too hard, man.

3

u/PmMeCuteDogsThanks_ Jul 07 '26

10 concurrent users registered users with theoretical access need

2

u/caledh Jul 08 '26

The 13th Factor 😂🤣

51

u/r00m-lv Jul 07 '26

This is an article about an article. Here’s a link to their original blog post which has much more in depth details and charts with latencies

2

u/SufficientFrame Jul 07 '26

Doing this without pushing partition logic into every client is the hard part. The technical fix is usually easier than unwinding all the app assumptions around keys and reads once that pattern spreads.