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Limitations

This topic describes some of the limitations of using Exchange 3.x.

Version compatibility

The correspondence between the Nebula Exchange release (the JAR version) and the Nebula Graph core release is as follows.

Exchange client Nebula Graph
3.0-SNAPSHOT nightly
3.0.0 3.2.0
2.6.x 2.6.x
2.5.x 2.5.x
2.1.0 2.0.0, 2.0.1
2.0.1 2.0.0, 2.0.1
2.0.0 2.0.0, 2.0.1

JAR packages are available in two ways: compile them yourself or download them from the Maven repository.

If you are using Nebula Graph 1.x, use Nebula Exchange 1.x.

Environment

Exchange 3.x supports the following operating systems:

  • CentOS 7
  • macOS

Software dependencies

To ensure the healthy operation of Exchange, ensure that the following software has been installed on the machine:

  • Java version 1.8
  • Scala version 2.10.7, 2.11.12, or 2.12.10
  • Apache Spark. The requirements for Spark versions when using Exchange to export data from data sources are as follows. In the following table, Y means that the corresponding Spark version is supported, and N means not supported.

    Note

    Use the correct Exchange JAR file based on the Spark version. For example, for Spark version 2.4, use nebula-exchange_spark_2.4-3.0.0.jar.

    Data source Spark 2.2 Spark 2.4 Spark 3
    CSV file Y N Y
    JSON file Y Y Y
    ORC file Y Y Y
    Parquet file Y Y Y
    HBase Y Y Y
    MySQL Y Y Y
    PostgreSQL Y Y Y
    ClickHouse Y Y Y
    Neo4j N Y N
    Hive Y Y Y
    MaxCompute N Y N
    Pulsar N Y Untested
    Kafka N Y Untested
    Nebula Graph N Y N

Hadoop Distributed File System (HDFS) needs to be deployed in the following scenarios:

  • Migrate HDFS data
  • Generate SST files

Last update: August 12, 2022