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| <h1>在DataNode上合并Container的RocksDB</h1> |
| |
| <!--- |
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| <p>在 Ozone 中，用户数据被分割成blocks并存储在 HDDS Container中。Container是 Ozone/HDDS 的基本复制单元。每个Container都有自己的元数据和数据, 数据以文件形式保存在磁盘上，元数据保存在RocksDB中。</p> |
| <p>目前，数据节点上的每个Container都有一个RocksDB。随着用户数据的不断增长，一个DataNode上将会有成百上千个RocksDB实例。在一个JVM中管理如此多的RocksDB实例是一个巨大的挑战。</p> |
| <p>与当前使用方法不同，“Merge Container RocksDB in DN"功能将为每个Volume只使用一个RocksDB，并在此RocksDB中保存所有Container的元数据。</p> |
| <h2 id="配置">配置</h2> |
| <p>这主要是DataNode的功能，不需要太多配置。</p> |
| <p>如果更倾向于为每个Container使用一个RocksDB的模式，那么这下面的配置可以禁用上面所介绍的功能。请注意，一旦启用该功能，强烈建议以后不要再禁用。</p> |
| <div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-XML" data-lang="XML"><span style="color:#f92672"><property></span> |
| <span style="color:#f92672"><name></span>hdds.datanode.container.schema.v3.enabled<span style="color:#f92672"></name></span> |
| <span style="color:#f92672"><value></span>false<span style="color:#f92672"></value></span> |
| <span style="color:#f92672"><description></span>Disable or enable this feature.<span style="color:#f92672"></description></span> |
| <span style="color:#f92672"></property></span> |
| </code></pre></div><p>无需任何特殊配置，单个RocksDB将会被创建在"hdds.datanode.dir"中所配置的数据卷下。</p> |
| <p>对于一些有高性能要求的高级集群管理员，他/她可以利用快速存储来保存RocksDB。在这种情况下，请配置下面这两个属性。</p> |
| <div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-XML" data-lang="XML"><span style="color:#f92672"><property></span> |
| <span style="color:#f92672"><name></span>hdds.datanode.container.db.dir<span style="color:#f92672"></name></span> |
| <span style="color:#f92672"><value/></span> |
| <span style="color:#f92672"><description></span>This setting is optional. Specify where the per-disk rocksdb instances will be stored.<span style="color:#f92672"></description></span> |
| <span style="color:#f92672"></property></span> |
| <span style="color:#f92672"><property></span> |
| <span style="color:#f92672"><name></span>hdds.datanode.failed.db.volumes.tolerated<span style="color:#f92672"></name></span> |
| <span style="color:#f92672"><value></span>-1<span style="color:#f92672"></value></span> |
| <span style="color:#f92672"><description></span>The number of db volumes that are allowed to fail before a datanode stops offering service. |
| Default -1 means unlimited, but we should have at least one good volume left.<span style="color:#f92672"></description></span> |
| <span style="color:#f92672"></property></span> |
| </code></pre></div><h3 id="向后兼容性">向后兼容性</h3> |
| <p>Existing containers each has one RocksDB for them will be still accessible after this feature is enabled. All container data will co-exist in an existing Ozone cluster.</p> |
| <h2 id="参考文献">参考文献</h2> |
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