Introducing Java Driver 4
The Java driver team is pleased to announce the general availability of two new major versions: OSS driver 4.0.0 and DSE driver 2.0.0.
These are long-awaited versions that address longstanding issues with the 3.x line:
- drop the dependency to Guava, and update the API to use Java 8 futures;
- make the driver more pluggable and better expose the internals;
- clean up the codebase and make it more modular.
This required a major redesign of the architecture, which results in API changes that are not backward-compatible with previous versions.
These releases also come with many improvements and new features:
- Generalized use of interfaces in the public API, backed by immutable implementations;
- New configuration mechanism that doesn't require rebuilding your application to change parameters;
- Support for execution profiles, to capture common set of options for different categories of requests;
- Unified top-level session component, that can be initialized in one step (no more Cluster), with improved protocol negotiation in mixed clusters, reconnection at startup, and built-in request throttling;
- Simplified load balancing: a single policy out of the box, that implements the best practices;
- True global request timeout;
- Driver-side cache of prepared statements, that gracefully handles preparing the same query multiple times;
- Improved ResultSet API, removing the dangerous methods that could accidentally trigger a blocking background fetch during asynchronous iteration;
- Improved metrics, that can be enabled or disabled individually, and expose per-node information;
- Improved metadata, with atomic updates and filtering features to limit CPU usage;
- Better handling of case-sensitivity in CQL identifiers;
- New pluggable request execution model that makes the driver even more extensible.
In addition, the DSE driver provides additional features to address the needs of our enterprise customer deployments:
- Brand-new reactive-style query execution model;
- Improved load balancing policy with a highly efficient "slow node avoidance" algorithm.
All these topics are covered in detail in our upgrade guide, where you'll also find links to the rest of our online manual for a deep dive on specific topics.
Note that the object mapper is not ported yet; we are actively working on it and plan to release it with OSS 4.1.0 / DSE 2.1.0 (see JAVA-2078).
The drivers are available from Maven Central as usual, but note that the OSS driver has new coordinates, and the Query Builder now resides in a separate artifact.
You can also download the drivers from our download servers here.