Sourced from com.arcadedb:arcadedb-network's releases.

26.2.1

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ArcadeDB 26.2.1 Release Notes

We're excited to announce ArcadeDB 26.2.1, a massive release that brings 484 commits and 200+ closed issues with significant advancements across the platform. This release focuses on hardening the native OpenCypher engine with official TCK compliance, introducing the Bolt protocol for Neo4j driver compatibility, a new plugin architecture, a powerful backup scheduler, a new SQL parser (ANTLR) and major performance optimizations.

🎯 Major New Features

Bolt Protocol (Neo4j Driver Compatibility)

ArcadeDB now supports the Neo4j Bolt wire protocol (#3250), allowing applications to connect using standard Neo4j drivers. This opens ArcadeDB to the vast ecosystem of Neo4j-compatible tools and libraries:

• First version of the Bolt wire protocol implementation
• Compatible with the official Neo4j Java driver
• Correct protocol version encoding and handshake negotiation (#3413)
• Proper field name preservation for single-element Cypher RETURN over Bolt (#3286)

Cypher LOAD CSV

Implemented the OpenCypher LOAD CSV clause (#3450), enabling bulk data import from CSV files directly in Cypher queries, including context functions file() and linenumber().

New SQL Parser (ANTLR4)

Replaced the legacy JavaCC-based SQL parser with a modern ANTLR4 implementation (#3195), providing:

• More robust and maintainable parsing infrastructure
• Better error messages and diagnostics
• Foundation for future SQL language extensions

Plugin Architecture with Isolated Class Loaders

Introduced a new modular plugin architecture (#3260) that supports isolated class loaders, enabling clean separation of plugin code from the core engine, dynamic loading/unloading at runtime, and reduced risk of dependency conflicts.

Backup Scheduler Plugin

A new backup scheduler plugin (#3263) allows automated, scheduled database backups with security validation — a highly requested feature for production deployments.

SQL Triggers

Added support for SQL triggers (#3222) that can execute SQL, JavaScript, and Java code, enabling powerful event-driven automation within the database.

HTTP Session Management

Introduced HTTP session support with token-based authentication, including configurable session expiration, new /login and /logout APIs, and a list of active connections in Studio.

Database Transient Variables via Redis

Added support for transient database global variables accessible through the Redis wire protocol (#3248), and Redis can now be used as a query language.

🔐 OpenCypher Engine Hardening

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Sourced from com.arcadedb:arcadedb-network's changelog.

ArcadeDB v26.2.1 Release Notes

New Features

Gremlin Multi-Database Support with ArcadeGraphManager

ArcadeDB now includes ArcadeGraphManager, a custom implementation of TinkerPop's GraphManager interface that provides dynamic, on-demand registration of databases as Gremlin graphs.

Key Features:

• Automatic Registration: When a Gremlin client requests a graph/traversal source by database name, it is automatically registered if the database exists
• Multi-Database Access: Access any database on the server through Gremlin without static configuration
• The g Alias: The standard g alias automatically maps to the default database ("graph" if it exists, otherwise the first available database)
• Transaction Support: Gremlin transactions now work correctly via the remote driver (fixes issue #1446)

Example - Accessing Multiple Databases:

var cluster = Cluster.build()
    .port(8182)
    .addContactPoint("localhost")
    .credentials("root", "password")
    .create();
// Access any database by name - registered automatically on first access
var customers = traversal().withRemote(DriverRemoteConnection.using(cluster, "customers"));
var products = traversal().withRemote(DriverRemoteConnection.using(cluster, "products"));
// Or use "g" for the default database
var g = traversal().withRemote(DriverRemoteConnection.using(cluster, "g"));

---

Migration

Gremlin Server Configuration Changes

Starting with v26.2.1, the Gremlin Server uses ArcadeGraphManager for dynamic database registration. This simplifies configuration and enables multi-database support.

What Changed

1. Graph Registration: Graphs are now registered dynamically by ArcadeGraphManager instead of statically in configuration files
2. Configuration Files: The graphs: section in gremlin-server.yaml is no longer required
3. The graph Binding: The internal graph variable is now managed by ArcadeGraphManager to properly support TinkerPop sessions and transactions

Backward Compatibility

• Existing Gremlin queries continue to work without modification
• The g alias still works and maps to the default database

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• ced6531 Set release version to 26.2.1
• 02cf473 Fix test failing because of locale (#3451)
• bf2587e fix: index remove edge for not unique indexes
• 9037185 Cypher load csv (#3450)
• 58da446 fix: OpenCypher functions
• 7503e30 fix: OpenCypher -> collflatten function
• c99c653 test: fixed broken OpenCypher TCK tests
• fa52063 chore: mega refactor of functions to be all under com.arcadedb.function + r...
• 071ad19 feat: added new functions for OpenCypher
• 17e0a71 Merge branch 'main' of https://github.com/ArcadeData/arcadedb
• Additional commits viewable in compare view

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