By Peter Corless

Mapped launched their service this year to enable businesses to control and manage their facilities via a unified AI-powered data infrastructure platform. Their modular and extensible platform brings together disparate data sets via various APIs related to the Industrial Internet of Things (IIoT). From your lobby, to your elevators, from your HVAC and power systems to your industrial devices and security systems, it provides an all-in-one-view.

Mapped has done precisely that — mapped over 30,000 different makes/models of devices across 900 different classes — using a GraphQL API and industry-standard ontology allowing developers and users to build…

by Peter Corless

Project Circe is ScyllaDB’s year-long initiative to make Scylla, already the best NoSQL database, even better. For the month of April we are going to take a look inside the organization and code base to see what it takes to bring major new features into a project as dynamic as Scylla. Currently there are nearly a half-million lines of code in the scylladb/scylla repository on Github (482.7k as of this writing). Of those thousands of source lines of code so far are dedicated to the library implementing the new Raft consensus protocol.

Raft and the Logical Clock

We’ve already covered what Raft…

By Piotr Dulikowski

In Scylla Open Source 4.3, we introduced a feature called shard-aware port. In addition to listening for CQL driver connections on the usual port (by default 9042), Scylla now also listens for connections on another port (by default 19042). The new port offers a more robust method of connecting to the cluster which decreases the number of connection attempts that the driver needs to make.

In this blogpost, we will describe problems that arise when using the old port and how the new port helps to overcome them.

Token-awareness, Shard-awareness

To understand the problem the shard-aware port solves, we…

By Nathan Pensack-Rinehart

In 2020, FullContact launched our Resolve product, backed by Cassandra. Initially, we were eager to move from our historical database HBase to Cassandra with its promises for scalability, high availability, and low latency on commodity hardware. However, we could never run our internal workloads as fast as we wanted — Cassandra didn’t seem to live up to expectations. Early on, we had a testing goal of hitting 1000 queries per second, and then soon after 10x-ing that to 10,000 queries per second through the API. …

by Nadav Har’El

In a previous post, Comparing CQL and the DynamoDB API, I introduced Scylla — an open-source distributed database which supports two popular NoSQL APIs: Cassandra’s query language (CQL) and Amazon’s DynamoDB API. The goal of that post was to outline some of the interesting differences between the two APIs.

In this post I want to look more closely at one of these differences: The fact that DynamoDB-API applications are not aware of the layout of the Scylla cluster and its individual nodes. This means that Scylla’s DynamoDB API implementation — Alternator - — needs a load balancing…

By Avishai Ish Shalom

Scylla Cloud now offers a new Scylla Cloud Calculator to help you estimate your costs based on your database needs. While it looks like a simple tool, anyone steeped in the art of database capacity planning knows that there is often far more to it than meets the eye. In this blog post we’ll show you how to use our handy new tool and then illustrate it with an example from a fictional company.

Considerations for the Cloud

One of the great things about using the cloud is that capacity planning mistakes can be cheaper: It is treated as an…

By Peter Corless

Springtime is here! It’s time for our monthly update on Project Circe, our initiative to make Scylla into an even more monstrous database. Monstrously more durable, stable, elastic, and performant. In March 2021 we released Scylla Open Source 4.4. This new software release provides a number of features and capabilities that fall under the key improvement goals we set out for Project Circe. Let’s hone in on the recent performance and manageability improvements we’ve delivered.

New Scheduler

The Seastar I/O scheduler is used to maximize the requests throughput from all shards to the storage. Until now, the scheduler was…

by Tzach Livyatan

The Scylla team is pleased to announce the release of Scylla Open Source 4.4, a production-ready release of our open source NoSQL database.

Scylla is an open source, NoSQL database with superior performance and consistently low latencies.

Scylla 4.4 includes performance, stability improvements and bug fixes (below).

Find the Scylla Open Source 4.4 repository for your Linux distribution here. Scylla 4.4 is also available as Docker, EC2 AMI and GCP image.

Please note that only the last two minor releases of the Scylla Open Source project are supported. Starting today, only Scylla Open Source 4.4 and Scylla…

by Peter Corless

Disasters can strike any business on any day. This particular disaster, a fire at the OVHcloud Strasbourg datacenter, struck recently and the investigation and recovery are still ongoing. This is an initial report of one company’s resiliency in the face of that disaster.

Overview of the Incident

Less than an hour after midnight on Wednesday, March 10, 2021, in the city of Strasbourg, at 0:47 CET, a fire began in a room at the SBG2 datacenter of OVHcloud, the popular French cloud provider. Within hours the fire had been contained, but not before wreaking havoc. The fire nearly entirely destroyed SBG2…

by Juliusz Stasiewicz

We are happy to announce the first release of a shard-aware C/C++ driver (connector library). It’s an API-compatible fork of Datastax cpp-driver 2.15.2, currently packaged for x86_64 CentOS 7 and Ubuntu 18.04 (with more to come!). It’s also easily compilable on most Linux distributions. The driver still works with Apache Cassandra and DataStax Enterprise (DSE), but when paired with Scylla enables shard-aware queries, delivering even greater performance than before.



Scylla C/C++ driver was forked from Datastax driver with the view to adding Scylla-specific features. It’s a rich, fast, async, battle-proven piece…


The monstrously-fast NoSQL database.

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