With just Base SAS, you can use the FILENAME statement to access data in HDFS, PROC HADOOP to interact with Hadoop data by running Apache Hadoop code, and the SPD Engine to write data, retrieve data, perform administrative functions and even update data in HDFS.
The version of SAS 9.4 determines which Hadoop distributions are supported. This site lists the SAS 9.4 supported Hadoop distributions for several SAS products, offerings, and technologies, including the Base SAS FILENAME statement, PROC HADOOP, and the SPD Engine:
SAS 9.4 Supported Hadoop Distributions
If you would like overview information for SAS and Hadoop technologies, use this document. Each overview tells you what the product is, what's required, and where to go for more detailed documentation.
SAS and Hadoop Technology: Overview
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