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| <h1>Containers</h1> |
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| <!--- |
| Licensed to the Apache Software Foundation (ASF) under one or more |
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| <p>容器是 Ozone/HDDS 的基本复制单元，由 Storage Container Manager (SCM) 服务管理。</p> |
| <p>容器是可以包含多个块的大型二进制单元：</p> |
| <p> |
| |
| <img src="Containers.png" alt='Containers' class="img-responsive" /></p> |
| <p>块作为本地信息，不由 SCM 管理。因此，即使在系统中创建了数十亿个小文件（即创建了数十亿个块），数据节点也仅报告容器的状态，以及复制容器。</p> |
| <p>当 Ozone Manager 向 SCM 请求分配一个新的块时，SCM 将找到一个合适的容器，并且产生一个包含 <code>容器ID</code> + <code>本地ID</code> 的块Id，客户端则连接到存储这个容器的数据节点上。而数据节点则能够基于 <code>本地ID</code> 管理这个独立的块。</p> |
| <h2 id="open-和-closed-容器">OPEN 和 CLOSED 容器</h2> |
| <p>当一个容器被创建后，它就以 OPEN 状态开始。而当其被写满（写入约 5GB 数据）时，它就会被关闭并且处于 CLOSED 状态。</p> |
| <p>OPEN 和 CLOSED 容器之间的根本区别：</p> |
| <table> |
| <thead> |
| <tr> |
| <th>OPEN</th> |
| <th>CLOSED</th> |
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| <td>可变</td> |
| <td>不可变</td> |
| </tr> |
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| <td>基于 RAFT (Ratis) 进行复制</td> |
| <td>异步地对容器副本进行复制</td> |
| </tr> |
| <tr> |
| <td>只有 Raft leader 用于读/写</td> |
| <td>所有节点都可用于读</td> |
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