October 19, 2026 · RapidMindLabs
Most Cassandra write-path incidents we audit start with a BATCH that was never supposed to be one. What logged, unlogged, and counter batches actually cost, the thresholds worth alerting on, and the rewrites that fix them.
Read moreSeptember 21, 2026
Telemetry and event data are the workload Cassandra was built for — and the one teams most often model into a corner. Time bucketing math, TTL rules, and the TWCS settings that decide whether expired data actually leaves disk.
Read moreSeptember 21, 2026 · RapidMindLabs
Sooner or later something downstream needs every change your cluster accepts — a search index, a warehouse, a Kafka topic. Cassandra's CDC is real but narrow. What the commit-log feed actually gives you, where the dedup and ordering work lands, and when to stop and pick a different pattern.
Read moreSeptember 17, 2026
IF NOT EXISTS is one line of CQL and four round trips of coordination. What an LWT actually does on the wire, the latency and contention numbers to expect, the modeling patterns that avoid them, and how Accord's transactions in the 5.x line change the calculus.
Read moreSeptember 10, 2026 · RapidMindLabs
Cassandra 5 added a vector type, ANN search, and Storage-Attached Indexing. Both are genuinely useful and both are easy to misuse. What changed, how the indexes behave under load, and when to keep your embeddings somewhere else.
Read moreAugust 11, 2026
We make our living on Cassandra, so believe us when we say: plenty of systems shouldn't use it. The workload shapes that fight the architecture, and what to reach for instead.
Read moreApril 14, 2026
Every Cassandra performance problem worth its name traces back to a partition key. Here is how to choose one that stays bounded, spreads load, and answers your queries — before the data arrives.
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