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| <h1>Overview</h1> |
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| <p>Ozone is a redundant, distributed object store optimized for Big data |
| workloads. The primary design point of ozone is scalability, and it aims to |
| scale to billions of objects.</p> |
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| <p>Ozone separates namespace management and block space management; this helps |
| ozone to scale much better. The namespace is managed by a daemon called |
| <a href="../concept/ozonemanager.html">Ozone Manager </a> (OM), and block space is |
| managed by <a href="../concept/hdds.html">Storage Container Manager</a> (SCM).</p> |
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| <p>Ozone consists of volumes, buckets, and keys. |
| A volume is similar to a home directory in the ozone world. |
| Only an administrator can create it.</p> |
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| <p>Volumes are used to store buckets. |
| Once a volume is created users can create as many buckets as needed. |
| Ozone stores data as keys which live inside these buckets.</p> |
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| <p>Ozone namespace is composed of many storage volumes. |
| Storage volumes are also used as the basis for storage accounting.</p> |
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| <p>The block diagram shows the core components of Ozone.</p> |
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| <p><img src="ozoneBlockDiagram.png" alt="Architecture diagram" /></p> |
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| <p>The Ozone Manager is the name space manager, Storage Container Manager |
| manages the physical and data layer and Recon is the management interface for |
| Ozone.</p> |
| |
| <h2 id="different-perspectives">Different Perspectives</h2> |
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| <p><img src="FunctionalOzone.png" alt="FunctionalOzone" /></p> |
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| <p>Any distributed system can be viewed from different perspectives. One way to |
| look at Ozone is to imagine it as Ozone Manager as a name space service built on |
| top of HDDS, a distributed block store.</p> |
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| <p>Another way to visualize Ozone is to look at the functional layers; we have a |
| metadata data management layer, composed of Ozone Manager and Storage |
| Container Manager.</p> |
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| <p>We have a data storage layer, which is basically the data nodes and they are |
| managed by SCM.</p> |
| |
| <p>The replication layer, provided by Ratis is used to replicate metadata (OM and SCM) |
| and also used for consistency when data is modified at the |
| data nodes.</p> |
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| <p>We have a management server called Recon, that talks to all other components |
| of Ozone and provides a unified management API and UX for Ozone.</p> |
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| <p>We have a protocol bus that allows Ozone to be extended via other |
| protocols. We currently only have S3 protocol support built via Protocol bus. |
| Protocol Bus provides a generic notion that you can implement new file system |
| or object store protocols that call into O3 Native protocol.</p> |
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