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ScyllaDB Open Source 5.0

ScyllaDb Open Source 5.0

ScyllaDB Open Source has a rich set of new production-ready features, including Lightweight Transactions (LWT), DynamoDB API compatibility, Change Data Capture, offline installers and more. Already the best high-performance NoSQL database for big data workloads, ScyllaDB was built to replace Apache Cassandra and Amazon DynamoDB by taking their best attributes and improving on performance, scalability, and cost-efficiency.

What’s New in ScyllaDB Open Source 5.0

Production Ready Features

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Support for AWS EC2 I4i Series Instances

ScyllaDB now supports the new AWS EC2 I4i series instances. The I4i series provides superior performance over the I3 series due to a number of factors: the Intel Xeon Ice Lake processors, the AWS Nitro System and low-latency Nitro NVMe SSDs. ScyllaDB can achieve 2x throughput and lower latencies on I4i instances over comparable i3 servers.

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I/O Scheduler Improvements

A new I/O scheduler was integrated via a Seastar update. The new scheduler is better at restricting disk I/O in order to keep latency low.

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Improved Reverse Queries

Reverse queries are SELECT statements that use reverse order from the table schema. If no order was defined, the default order is ascending (ASC). For example, imagine rows in a partition sorted by time in ascending order. A reverse query would sort rows in descending order, with the newest rows first. Reverse queries were improved in ScyllaDB Open Source 4.6, and are further improved in 5.0, first, to return short pages to limit memory consumption, and secondly, for reverse queries to leverage ScyllaDB’s row-based cache (before 5.0 they bypassed the cache).

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New Virtual Tables for Configuration and Nodetool Information

A new system.config virtual table allows querying and updating a subset of configuration parameters over CQL. These updates are not persistent, and will return to the scylla.yaml update after restart. Nodetool command information can also be accessed via virtual tables, including snapshots, protocol servers, runtime info, and a virtual table replacement for nodetool versions. Virtual tables allow remote access over CQL, including for Scylla Cloud users.

Experimental Features

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Schema Changes using Raft (5.0+)

Unstable schema management has been a problem in all Apache Cassandra and ScyllaDB versions so far. Using the new Raft consensus protocol support in ScyllaDB, you can now perform immediate and safe schema management for DDL operations like CREATE, ALTER, DROP for KEYSPACE, TABLE, INDEX, UDT, MV etc.

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More Robust Tombstone Garbage Collection

Tombstones (markers that indicate deleted records) that are older than the most recent repair can now be automatically purged, and newer ones will be kept. This drops tombstones more frequently if repairs are made in a timely manner, and prevents data resurrection if repairs are delayed beyond gc_grace_seconds.

Other ScyllaDB Open Source Features

See what we introduced in ScyllaDB 4.0 Read More
See what we introduced prior to ScyllaDB 4.0. Read More


ScyllaDB is the monstrously fast and scalable NoSQL database perfect for industry gamechangers. Discover the latest features of our distributed database.

Join our co-founders, CEO Dor Laor and CTO Avi Kivity for an overview of ScyllaDB 4.0.

Our open source Amazon DynamoDB-compatible API allows you to run your database on any cloud or on premises.

Read details on ScyllaDB’s newest capabilities, and see all of the software quality fixes that went into the latest major release.

Discover how ScyllaDB Open Source 5.0 uses a custom IO scheduler and algorithms to keep disk load perfectly balanced.

ScyllaDB adopted Raft as a consensus protocol to provide immediately consistent schema changes. Learn more how we did it.

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