NebulaGraph 1.0 Release Notes

Basic Features

• Online DDL & DML. Support updating schemas and data without stopping or affecting your ongoing operations.
• Graph traversal. GO statement supports forward/reverse and bidirectional graph traversal. GO minHops TO maxHops is supported to get variable hops relationships.
• Aggregate. Support aggregation functions such as GROUP BY, ORDER BY, and LIMIT.
• Composite query. Support composite clauses: UNION, UNION DISTINCT, INTERSECT, and MINUS.
• PIPE statements. The result yielded from the previous statement could be piped to the next statement as input.
• Use defined variables. Support user-defined variables to pass the result of a query to another.
• Index. Both the single-property index and composite index are supported to make searches of related data more efficient. LOOKUP ON statement is to query on the index.

Advanced Features

• Privilege Management. Support user authentication and role-based access control. NebulaGraph can easily integrate with third-party authentication systems. There are five built-in roles in NebulaGraph: GOD, ADMIN, DBA, USER, and GUEST. Each role has its corresponding privileges.
• Support Reservoir Sampling, which will retrieve k elements randomly for the sampling of the supernode at the complexity of O(n).
• Cluster snapshot. Support creating snapshots for the cluster as an online backup strategy.
• TTL. Support  TTL to expire items after a certain amount of time automatically.
• Operation & Maintenance
  • Scale in/out. Support online scale in/out and load balance for storage
  • HOSTS clause to manage storage hosts
  • CONFIGS clause to manage configuration options
• Job Manager & Scheduler. A tool for job managing and scheduling. Currently, COMPACT and FLUSH jobs are supported.
• Graph Algorithms. Support finding the full path and the shortest path between vertices.
• Provide OLAP interfaces to integrate with third-party graph analytics platforms.
• Support multiple character sets and collations. The default CHARSET and COLLATE are utf8 and utf8_bin.

Clients

• Java Client. Support source code building and downloading from the MVN repository, see Java Client for more details.
• Python Client. Support source code building and installation with pip, see Python Client for more details.
• Golang Client. Install the client with the command go get -u -v github.com/vesoft-inc/nebula-go，see Go Client for more details.

NebulaGraph Studio

A graphical user interface for working with Nebula. Support querying, designing schema, data loading, and graph exploring. See NebulaGraph Studio  for more details.

Tools

• Data Import  
  • Nebula-Importer is used to import data from the CSV file.
  • Spark Writer, a Spark-based distributed data import tool that converts data from multiple data resources into the NebulaGraph.
• Data Export   
  • Dump Tool. A single-machine off-line data dumping tool to dump or count data with specified conditions.
• Monitoring 
  • Nebula Stats Exporter (for Prometheus), is to collect database metrics and expose metrics to Prometheus. And Grafana has integrated for metrics Visualization and Alerting.