--- title: "Dynamically Splitting Wide Partitions in Cassandra for Time Series Workloads" url: https://daily.dev/posts/dynamically-splitting-wide-partitions-in-cassandra-for-time-series-workloads-eklydxjkb source_url: https://netflixtechblog.com/dynamically-splitting-wide-partitions-in-cassandra-for-time-series-workloads-0eded064f456 type: article source: "Netflix TechBlog" published: 2026-06-03T07:13:18.737Z updated: 2026-06-07T17:51:26.689Z tags: ["data-science", "distributed-systems", "apache-cassandra"] reading_time: 11 upvotes: 17 comments: 1 language: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # Dynamically Splitting Wide Partitions in Cassandra for Time Series Workloads **[Netflix TechBlog](https://daily.dev/sources/netflix)** · 11 min read · 17 upvotes · 1 comments ## Summary Netflix's TimeSeries Abstraction team shares how they tackled wide partition problems in Apache Cassandra for petabyte-scale time series workloads. Two solutions are detailed: (1) Time Slice Re-Partitioning, a background worker that monitors partition histograms and automatically adjusts future time slice configurations; and (2) Dynamic Partitioning per ID, an asynchronous pipeline that detects wide partitions during reads, plans and executes splits at the individual TimeSeries ID level, and transparently re-routes reads to split partitions using in-memory Bloom filters. The dynamic partitioning approach reduced average read latency from seconds to low double-digit milliseconds, dropped tail latencies to ~200ms, and eliminated most read timeouts, resulting in a more stable cluster with lower CPU utilization. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Similar posts on daily.dev - [Netflix Cuts Cassandra Read Latency from Seconds to Milliseconds with Dynamic Partition Splitting](https://daily.dev/posts/netflix-cuts-cassandra-read-latency-from-seconds-to-milliseconds-with-dynamic-partition-splitting-fon4jrhm4) · InfoQ · 10 upvotes · 0 comments --- Tags: [#data-science](https://daily.dev/tags/data-science), [#distributed-systems](https://daily.dev/tags/distributed-systems), [#apache-cassandra](https://daily.dev/tags/apache-cassandra) [View this post on daily.dev](https://daily.dev/posts/dynamically-splitting-wide-partitions-in-cassandra-for-time-series-workloads-eklydxjkb)