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Git branch: https://github.com/apache/ozone/tree/HDDS-3630

For a quick intro to the S3 multi-tenancy feature, here is an excerpt from the documentation:

Before Ozone multi-tenancy, all S3 access to Ozone (via S3 Gateway) are
confined to a single designated S3 volume (that is volume `s3v`, by default).

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Currently there will be one RocksDB for each Container on datanode, which leads to hundreds of thousands of RocksDB instances on one datanode. It's very challenge to manage this amount of RocksDB instances in one JVM. Please refer to the "problem statement" section of the design document[1] for detail challenges. Different than current approach, Datanode RocksDB merge feature will use only one RocksDB for each data volume. With far less RocksDB instance to manage, the write path performance and DN stability is improvement, Refer to the Micro Benchmark Data section of design document[1]. 

For more, please check out the full documentation. The doc has feature overview, setup guide, CLI guide and access control guide (best viewed locally rendered using hugo serve command under ./hadoop-hdds/docs/ , as it is not published to the website yet).

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