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| <h1>Storage Container Manager</h1> |
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| <p>Storage Container Manager (SCM) is the leader node of the <em>block space management</em>. The main responsibility is to create and manage <a href="../concept/containers.html">containers</a> which is the main replication unit of Ozone.</p> |
| <p><img src="StorageContainerManager.png" alt="Storage Container Manager"></p> |
| <h2 id="main-responsibilities">Main responsibilities</h2> |
| <p>Storage container manager provides multiple critical functions for the Ozone |
| cluster. SCM acts as the cluster manager, Certificate authority, Block |
| manager and the Replica manager.</p> |
| <p>SCM is in charge of creating an Ozone cluster. When an SCM is booted up via <code>init</code> command, SCM creates the cluster identity and root certificates needed for the SCM certificate authority. SCM manages the life cycle of a data node in the cluster.</p> |
| <ol> |
| <li> |
| <p>SCM is the block manager. SCM |
| allocates blocks and assigns them to data nodes. Clients |
| read and write these blocks directly.</p> |
| </li> |
| <li> |
| <p>SCM keeps track of all the block |
| replicas. If there is a loss of data node or a disk, SCM |
| detects it and instructs data nodes make copies of the |
| missing blocks to ensure high availability.</p> |
| </li> |
| <li> |
| <p><strong>SCM’s Certificate Authority</strong> is in |
| charge of issuing identity certificates for each and every |
| service in the cluster. This certificate infrastructure makes |
| it easy to enable mTLS at network layer and the block |
| token infrastructure depends on this certificate infrastructure.</p> |
| </li> |
| </ol> |
| <h2 id="main-components">Main components</h2> |
| <p>For a detailed view of Storage Container Manager this section gives a quick overview about the provided network services and the stored persisted data.</p> |
| <h3 id="network-services-provided-by-storage-container-manager">Network services provided by Storage Container Manager:</h3> |
| <ul> |
| <li>Pipelines: List/Delete/Activate/Deactivate |
| <ul> |
| <li>pipelines are set of datanodes to form replication groups</li> |
| <li>Raft groups are planned by SCM</li> |
| </ul> |
| </li> |
| <li>Containers: Create / List / Delete containers</li> |
| <li>Admin related requests</li> |
| <li>Safemode status/modification</li> |
| <li>Replication manager start / stop</li> |
| <li>CA authority service</li> |
| <li>Required by other sever components</li> |
| <li>Datanode HeartBeat protocol |
| <ul> |
| <li>From Datanode to SCM (30 sec by default)</li> |
| <li>Datanodes report the status of containers, node…</li> |
| <li>SCM can add commands to the response</li> |
| </ul> |
| </li> |
| </ul> |
| <p>Note: client doesn’t connect directly to the SCM</p> |
| <h3 id="persisted-state">Persisted state</h3> |
| <p>The following data is persisted in Storage Container Manager side in a specific RocksDB directory</p> |
| <ul> |
| <li>Pipelines |
| <ul> |
| <li>Replication group of servers. Maintained to find a group for new container/block allocations.</li> |
| </ul> |
| </li> |
| <li>Containers |
| <ul> |
| <li>Containers are the replication units. Data is required to act in case of data under/over replicated.</li> |
| </ul> |
| </li> |
| <li>Deleted blocks |
| <ul> |
| <li>Block data is deleted in the background. Need a list to follow the progress.</li> |
| </ul> |
| </li> |
| <li>Valid cert, Revoked certs</li> |
| <li>Used by the internal Certificate Authority to authorize other Ozone services</li> |
| </ul> |
| <h2 id="notable-configurations">Notable configurations</h2> |
| <table> |
| <thead> |
| <tr> |
| <th>key</th> |
| <th>default</th> |
| <th>description</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td>ozone.scm.container.size</td> |
| <td>5GB</td> |
| <td>Default container size used by Ozone</td> |
| </tr> |
| <tr> |
| <td>ozone.scm.block.size</td> |
| <td>256MB</td> |
| <td>The default size of a data block.</td> |
| </tr> |
| <tr> |
| <td>hdds.scm.safemode.min.datanode</td> |
| <td>1</td> |
| <td>Minimum number of datanodes to start the real work.</td> |
| </tr> |
| <tr> |
| <td>ozone.scm.http-address</td> |
| <td>0.0.0.0:9876</td> |
| <td>HTTP address of the SCM server</td> |
| </tr> |
| <tr> |
| <td>ozone.metadata.dirs</td> |
| <td>none</td> |
| <td>Directory to store persisted data (RocksDB).</td> |
| </tr> |
| </tbody> |
| </table> |
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