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| 元数据恢复 |
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| Replica数据恢复 |
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| Table迁移 |
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| Table软删除 |
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| Table环境变量 |
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| 远程命令 |
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| Partition-Split |
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| 跨机房同步 |
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| Manual Compact功能 |
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| Usage Scenario功能 |
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| 白名单 |
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| Backup Request |
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| 热点检测 |
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| <div class="navbar-start w-full"> |
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| <div id="docsearch"></div> |
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| <!--IF its language is zh, then switches to en.--> |
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| prevents a url from being relativized by polyglot.--> |
| <a class="button is-light is-outlined is-inverted" href=" /administration/zk-migration"><strong>En</strong></a> |
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| <section class="hero is-info lg:mr-3"> |
| <div class="hero-body"> |
| |
| <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依赖Zookeeper存储元数据和抢主，所以Zookeeper服务的不稳定会造成Pegasus服务不稳定，有时就需要迁移到其他更稳定或者空闲的Zookeeper上。</p> |
| |
| <p>Zookeeper迁移提供了两种办法：通过元数据恢复迁移；通过zkcopy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。基本思路就是配置新的Zookeeper后，通过recover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app列表</p> |
| |
| <p>使用shell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</p> |
| |
| <p>停掉所有meta server，并等待30秒以上，以保证所有replica server因为心跳超时进入INACTIVE状态。</p> |
| </li> |
| <li> |
| <p>修改meta配置文件</p> |
| |
| <p>修改meta server的配置文件，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> |
| <ul> |
| <li>将<code class="language-plaintext highlighter-rouge">recover_from_replica_server</code>设置为true</li> |
| <li>将zookeeper的<code class="language-plaintext highlighter-rouge">hosts_lists</code>改为新的服务地址</li> |
| </ul> |
| </li> |
| <li> |
| <p>启动一个meta</p> |
| |
| <p>启动其中一个meta server。</p> |
| </li> |
| <li> |
| <p>通过shell发送recover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> |
| <p>检查恢复结果，如果出错请参考<a href="meta-recovery#常见问题整理">常见问题整理</a>排查问题。</p> |
| </li> |
| <li> |
| <p>修改配置文件并重启meta</p> |
| |
| <p>恢复成功后，需要修改配置文件，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> |
| |
| <p>重新启动所有的meta server，集群进入正常状态。</p> |
| </li> |
| </ol> |
| |
| <p>注：<a href="https://github.com/apache/incubator-pegasus/blob/master/scripts/pegasus_migrate_zookeeper.sh">scripts/pegasus_migrate_zookeeper.sh</a>是我们在内部使用的迁移Zookeeper的脚本，虽然因为服务启停功能的兼容性不能直接使用，但是可以参考其中的流程，或者进行改造。</p> |
| |
| <h1 id="通过zkcopy工具迁移">通过zkcopy工具迁移</h1> |
| |
| <p>基本思路就是使用zkcopy工具将原始Zookeeper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时有其他的备meta server抢到锁，造成状态混乱，在整个迁移过程中只保留一个主meta server，其他的备meta server全部停掉。</p> |
| </li> |
| <li> |
| <p>修改主meta server状态为blind</p> |
| |
| <p>将主meta server的level设置为blind（关于meta server的level介绍请参见<a href="rebalance#控制集群的负载均衡">负载均衡</a>），以禁止任何对Zookeeper数据的更新操作，防止在copy过程中出现不一致：</p> |
| <div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>>>> set_meta_level blind |
| </code></pre></div> </div> |
| </li> |
| <li> |
| <p>使用zkcopy工具拷贝Zookeeper数据</p> |
| |
| <p>通过shell的<code class="language-plaintext highlighter-rouge">cluster_info</code>命令获取Zookeeper元数据节点路径<code class="language-plaintext highlighter-rouge">zookeeper_root</code>，然后使用zkcopy工具将该节点的数据完全拷贝到新集群的节点上，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zookeeper的<code class="language-plaintext highlighter-rouge">hosts_lists</code>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工具检查集群进入正常状态。</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zookeepercli工具的rmr命令清理旧zookeeper上的数据。</p> |
| </li> |
| </ol> |
| |
| <p>注：上面使用到的<code class="language-plaintext highlighter-rouge">zkcopy</code>和<code class="language-plaintext highlighter-rouge">zookeepercli</code>工具以后会提供出来。</p> |
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