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NebulaGraph RC3 Release Note

Release note

Main features and fixes for this release include dump_tools to export data by specific filters, graph data exploring tool NebulaGraph Studio, and vertex/edge scan interface for OLAP scenarios.  

Below is a list of details.

Query engine

  • Support fetching all props of a given vertex #1486
  • Support DELETE EDGE to delete the given edge #1063
  • Add IF EXISTS to conditionally drop a tag/edgetype only if it exists. #1505
  • Add IF NOT EXISTS to conditionally create a space/tag/edge only if it not exists #1379
  • Export graphd metrics #1451

Storage

  • Add scan edge/vertex interface to retrieve data from storage for OLAP, #1381
  • Support heartbeat_interval_secs option to config heartbeat interval between storage/graph and meta #1540
  • Pushdown filter to minimize data transfer and improve query performance #947
  • Support local conf mode, using local conf rather than config in meta server #1411
  • Add timeout for storage/meta clients, the default value is 60s and configured by meta_client_timeout_ms option #1399
  • Support creating a snapshot for the whole cluster #1199 #1372
  • Both support reading from leader/follow and support only read from the leader #1363
  • Add check step for each balance task during balancing process. #1378

Build

  • Simplify the build process, support most of Linux Kernel 2.6.32+ system #1332

Index

  • Support create an index,get a list of all indexes in the space and drop an index #1459  #1360

Tools

  • dump_tools , an off-line data dumping tool that can be used to dump or count data with specified conditions. #1479  #1554
  • Spark Writer adopts async client,add hash and uuid support,support load data into the same schema from different data source #1405 #1512.
  • Spark Writer supports configuring Spark partition,more numerous partitions allow work to be distributed among more workers, however, fewer partitions allow work to be done in larger chunks (and often quicker). #1412

UI

  • NebulaGraph Studio is the graphical user interface for working with Nebula. Query, visualize nebula and import CSV data to Nebula. Visualize and explore graph data via the interface; an editor with syntax highlighting feature enables users to design queries fast and view query results in a structured manner; support data import via GUI. Here's the repo of this tool (including documentation and deployment files): https://github.com/vesoft-inc/nebula-web-docker

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