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Ozone2 Storage Elements

Ozone, being an object storage for Hadoop, consists of volumes, buckets, and keys:

  • Volume: Volumes are similar to user accounts. Only administrators can create or delete volumes. Ozone creates s3v volume during initialization to support S3 Protocol.
  • Bucket: Buckets are similar to directories and reside in volume. It resembles Amazon S3 Buckets in terms of hierarchy and ACL. A bucket can contain any number of keys, but buckets cannot contain other buckets. OzoneManager supports two metadata bucket layout formats - Object Store (OBS) and File System Optimized (FSO). By default, Ozone sets all buckets layout to FILE_SYSTEM_OPTIMIZED but buckets under s3v volume are ofOBJECT_STORE layout.
  • Key: Keys are similar to files.