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| <p class="title is-size-2 is-centered">Zookeeper 迁移</p> |
| </div> |
| </section> |
| <section class="section" style="padding-top: 2rem;"> |
| <div class="content"> |
| <p>由于 Pegasus 的 Meta Server 使用 Zookeeper 来存储元数据和选主，所以 Zookeeper 服务的不稳定会造成 Pegasus 服务不稳定，必要时需要迁移元数据到其他更稳定或者空闲的 Zookeeper 上。</p> |
| |
| <p>Zookeeper 元数据迁移有两种方式：通过元数据恢复迁移，或通过 <code class="language-plaintext highlighter-rouge">zkcopy</code> 工具迁移。</p> |
| |
| <h1 id="通过元数据恢复迁移">通过元数据恢复迁移</h1> |
| |
| <p>Pegasus 提供了 <a href="meta-recovery">元数据恢复</a> 功能，这个功能也可用于 Zookeeper 迁移。基本思路是配置新的 Zookeeper 后，通过 <code class="language-plaintext highlighter-rouge">recover</code> 命令发起元数据恢复，这样元数据就写入新的 Zookeeper 上。</p> |
| |
| <ol> |
| <li> |
| <p>备份 table 列表</p> |
| |
| <p>使用 shell 工具的 <code class="language-plaintext highlighter-rouge">ls</code> 命令：</p> |
| <div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>>>> ls -o apps.list |
| </code></pre></div> </div> |
| </li> |
| <li> |
| <p>备份 node 列表</p> |
| |
| <p>使用 shell 工具的 <code class="language-plaintext highlighter-rouge">nodes</code> 命令：</p> |
| <div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>>>> nodes -d -o nodes.list |
| </code></pre></div> </div> |
| |
| <p>生成元数据恢复所需的 <code class="language-plaintext highlighter-rouge">recover_node_list</code> 文件：</p> |
| <div class="language-bash highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="nb">grep </span>ALIVE nodes.list | <span class="nb">awk</span> <span class="s1">'{print $1}'</span> <span class="o">></span> recover_node_list |
| </code></pre></div> </div> |
| </li> |
| <li> |
| <p>停掉所有 Meta Server</p> |
| |
| <p>停掉所有 Meta Server，并等待一段时间（默认为 30 秒，取决于配置项 <code class="language-plaintext highlighter-rouge">[replication]config_sync_interval_ms</code>），以保证所有 Replica Server 因为心跳超时进入 <code class="language-plaintext highlighter-rouge">INACTIVE</code> 状态。</p> |
| </li> |
| <li> |
| <p>修改 Meta Server 配置文件</p> |
| |
| <p>修改内容如下：</p> |
| <div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>[meta_server] |
| recover_from_replica_server = true |
| [zookeeper] |
| hosts_list = {new Zookeeper host list} |
| </code></pre></div> </div> |
| <p>即：</p> |
| <ul> |
| <li>将 <code class="language-plaintext highlighter-rouge">recover_from_replica_server</code> 设置为 <code class="language-plaintext highlighter-rouge">true</code>，开启从 Replica Server 恢复元数据的开关</li> |
| <li>更新 Zookeeper 配置更新为新的服务地址</li> |
| </ul> |
| </li> |
| <li> |
| <p>启动一个 Meta Server</p> |
| |
| <p>启动集群中的一个 Meta Server，它将成为集群的主 Meta Server。</p> |
| </li> |
| <li> |
| <p>通过 shell 工具发送 <code class="language-plaintext highlighter-rouge">recover</code> 命令</p> |
| |
| <div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>>>> recover -f recover_node_list |
| </code></pre></div> </div> |
| </li> |
| <li> |
| <p>修改配置文件并重启 Meta Server</p> |
| |
| <p>恢复成功后，需要修改 Meta Server 的配置文件，重新改回非 recovery 模式：</p> |
| <div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>[meta_server] |
| recover_from_replica_server = false |
| </code></pre></div> </div> |
| </li> |
| <li> |
| <p>重新启动所有的 Meta Server，集群进入正常状态。</p> |
| </li> |
| </ol> |
| |
| <h2 id="示例脚本">示例脚本</h2> |
| |
| <p>可以参考 Zookeeper 元数据迁移的示例脚本 <a href="https://github.com/apache/incubator-pegasus/blob/master/scripts/pegasus_migrate_zookeeper.sh">pegasus_migrate_zookeeper.sh</a> 中的主要流程。</p> |
| |
| <h1 id="通过-zkcopy-工具迁移">通过 <code class="language-plaintext highlighter-rouge">zkcopy</code> 工具迁移</h1> |
| |
| <p>基本思路就是使用 <a href="https://github.com/ksprojects/zkcopy">zkcopy 工具</a> 将原始 Zookeeper 上的 Pegasus 元数据拷贝到目标 Zookeeper 上，修改 Meta Server 配置文件并重启。</p> |
| |
| <ol> |
| <li> |
| <p>停掉所有的备 Meta Server</p> |
| |
| <p>为了防止重启主 Meta Server 时，其他的备 Meta Server 抢到锁而成为新的主，造成元数据不一致的问题，需要在整个迁移过程中只保留主 Meta Server 为存活状态，其他的备 Meta Server 全部停掉。</p> |
| </li> |
| <li> |
| <p>修改主 Meta Server 状态为 <code class="language-plaintext highlighter-rouge">blind</code></p> |
| |
| <p>将主 Meta Server 的 meta_level 设置为 <code class="language-plaintext highlighter-rouge">blind</code>，以禁止任何对 Zookeeper 数据的更新操作，防止在迁移过程中出现引起元数据不一致：</p> |
| <div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>>>> set_meta_level blind |
| </code></pre></div> </div> |
| <blockquote> |
| <p>关于 Meta Server 的 meta_level 介绍请参见 <a href="rebalance#控制集群的负载均衡">负载均衡</a>。</p> |
| </blockquote> |
| </li> |
| <li> |
| <p>使用 zkcopy 工具拷贝 Zookeeper 元数据</p> |
| |
| <p>通过 shell 工具的 <code class="language-plaintext highlighter-rouge">cluster_info</code> 命令获取 Pegasus 元数据存储在 Zookeeper 上的路径 <code class="language-plaintext highlighter-rouge">zookeeper_root</code>，然后使用 zkcopy 工具将该路径的数据全部拷贝到新 Zookeeper 上，注意需要递归拷贝。</p> |
| </li> |
| <li> |
| <p>修改配置文件</p> |
| |
| <p>修改 Meta Server 的配置文件，将 <code class="language-plaintext highlighter-rouge">hosts_lists</code> 配置值改为新的服务地址：</p> |
| <div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>[meta_server] |
| hosts_list = {new Zookeeper host list} |
| </code></pre></div> </div> |
| </li> |
| <li> |
| <p>重启主 Meta Server</p> |
| |
| <p>重新启动主 Meta Server，通过 shell 工具 <a href="/zh/administration/experiences#问题排查">检查</a> 集群进入正常状态。</p> |
| </li> |
| <li> |
| <p>启动所有备 Meta Server</p> |
| |
| <p>启动所有备 Meta Server，集群进入正常状态。</p> |
| </li> |
| <li> |
| <p>清理旧 Zookeeper 上的数据</p> |
| |
| <p>使用 <a href="https://github.com/openark/zookeepercli">zookeepercli 工具</a> 的 <code class="language-plaintext highlighter-rouge">rmr</code> 命令清理旧 Zookeeper 上的数据。</p> |
| </li> |
| </ol> |
| |
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