Limitations

This topic describes some of the limitations of using Exchange 3.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_2.4-3.8.0.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
  Oracle	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
  NebulaGraph	N	Y	N

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

• Migrate HDFS data
• Generate SST files

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Last update: October 24, 2023