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| <h1 id="datanode-decommission">DataNode Decommission</h1> |
| <p>DataNode Decommission是从Ozone集群中删除现有DataNode的过程中，同时确保新数据不会被写入正在Decommission的DataNode。当你启动DataNode Decommission的操作时候，Ozone会自动确保在Decommission完成之前，该数据节点上的所有Storage containers都在另一个DataNode上创建了额外的副本。因此，DataNode在Decommission完成后可以继续运行，并可用于读取，但不能用于写入，直到手动停止DataNode的服务。</p> |
| <p>当我们启动Decommission时，这个操作首先要检查节点的当前状态，理想情况下应该是 “IN_SERVICE”，然后将其状态更改为 “DECOMMISSIONING”，并启动Decommission的流程：</p> |
| <ol> |
| <li> |
| <p>首先它会触发一个事件，关闭节点上的所有Pipelines，同时关闭所有Containers。</p> |
| </li> |
| <li> |
| <p>然后获取节点上的Container信息，并检查是否需要新的副本。如果需要，创建新的副本的任务就会被调度起来。</p> |
| </li> |
| <li> |
| <p>复制任务被调度后，节点仍处于待处理状态，直到复制任务完成。</p> |
| </li> |
| <li> |
| <p>在此阶段，节点将完成Decommission的过程，然后节点状态将更改为 “DECOMMISSIONED”。</p> |
| </li> |
| </ol> |
| <p>要检查DataNode的当前状态，可以执行以下命令,</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-shell" data-lang="shell">ozone admin datanode list |
| </code></pre></div><p>要decommission某台datanode的时候，可以执行下面的命令,</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-shell" data-lang="shell">ozone admin datanode decommission <span style="color:#f92672">[</span>-hV<span style="color:#f92672">]</span> <span style="color:#f92672">[</span>-id<span style="color:#f92672">=</span><scmServiceId><span style="color:#f92672">]</span> |
| <span style="color:#f92672">[</span>--scm<span style="color:#f92672">=</span><scm><span style="color:#f92672">]</span> <span style="color:#f92672">[</span><hosts>...<span style="color:#f92672">]</span> |
| </code></pre></div><p>您可以输入多个主机，以便一起Decommission多个DataNode。</p> |
| <p><strong>Note:</strong> 要Recommission某台DataNode的时候，可在命令行执行以下命令,</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-shell" data-lang="shell">ozone admin datanode recommission <span style="color:#f92672">[</span>-hV<span style="color:#f92672">]</span> <span style="color:#f92672">[</span>-id<span style="color:#f92672">=</span><scmServiceId><span style="color:#f92672">]</span> |
| <span style="color:#f92672">[</span>--scm<span style="color:#f92672">=</span><scm><span style="color:#f92672">]</span> <span style="color:#f92672">[</span><hosts>...<span style="color:#f92672">]</span> |
| </code></pre></div><h1 id="om-decommission">OM Decommission</h1> |
| <p>Ozone Manager（OM）Decommissioning是指从 OM HA Ring 中从容地(gracefully)移除一个 OM 的过程。</p> |
| <p>要Decommission OM 并将这个节点从 OM HA ring中移除，需要执行以下步骤。</p> |
| <ol> |
| <li>将要被Decommission的 OM 节点的 <em>OM NodeId</em> 添加到所有其他 OM 的 <em>ozone-site.xml</em> 中的 <em>ozone.om.decommissioned.nodes.<omServiceId></em> 属性中。</li> |
| <li>运行以下命令Decommission这台 OM 节点.</li> |
| </ol> |
| <div class="highlight"><pre style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4"><code class="language-shell" data-lang="shell">ozone admin om decommission -id<span style="color:#f92672">=</span><om-service-id> -nodeid<span style="color:#f92672">=</span><decommissioning-om-node-id> -hostname<span style="color:#f92672">=</span><decommissioning-om-node-address> <span style="color:#f92672">[</span>optional --force<span style="color:#f92672">]</span> |
| </code></pre></div><p>_force选项将跳过检查 <em>ozone-site.xml</em> 中的 OM 配置是否已更新，并将Decommission节点添加至 <em><strong>ozone.om.decommissioned.nodes</strong></em> 配置中. <p><strong>Note -</strong> 建议在Decommissioning一个 OM 节点之前bootstrap另一个 OM 节点，以保持OM的高可用性（HA）.</p></p> |
| <h1 id="scm-decommission">SCM Decommission</h1> |
| <p>存储容器管理器 (SCM) Decommissioning 是允许您从容地(gracefully)将一个 SCM 从 SCM HA Ring 中移除的过程。</p> |
| <p>在Decommission一台SCM，并将其从SCM HA ring中移除时，需要执行以下步骤。</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-shell" data-lang="shell">ozone admin scm decommission <span style="color:#f92672">[</span>-hV<span style="color:#f92672">]</span> <span style="color:#f92672">[</span>--service-id<span style="color:#f92672">=</span><scmServiceId><span style="color:#f92672">]</span> -nodeid<span style="color:#f92672">=</span><nodeId> |
| </code></pre></div><p>执行以下命令可获得 “nodeId”： <strong>“ozone admin scm roles “</strong></p> |
| <h3 id="leader-scm">Leader SCM</h3> |
| <p>如果需要decommission <strong>leader</strong> SCM, 您必须先将leader的角色转移到另一个 scm，然后再Decommission这个节点。</p> |
| <p>您可以使用以下的命令来转移leader的角色，</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-shell" data-lang="shell">ozone admin scm transfer <span style="color:#f92672">[</span>--service-id<span style="color:#f92672">=</span><scmServiceId><span style="color:#f92672">]</span> -n<span style="color:#f92672">=</span><nodeId> |
| </code></pre></div><p>在Leader的角色成功地转移之后，您可以继续decommission的操作。</p> |
| <h3 id="primordial-scm">Primordial SCM</h3> |
| <p>如果要decommission <strong>primordial</strong> scm，必须更改 <em>ozone.scm.primordial.node.id</em> 的属性，使其指向不同的 SCM，然后再继续decommissioning。</p> |
| <h3 id="注意">注意</h3> |
| <p>在运行SCM decommissioning的操作期间，应手动删除decommissioned SCM的私钥。私钥可在 <em>hdds.metadata.dir</em> 中找到。</p> |
| <p>在支持证书吊销之前（HDDS-8399），需要手动删除decommissioned SCM上的证书。</p> |
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