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| Highway |
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| |
| <h1 id="java-chassis-3zookeeper">Java Chassis 3技术解密:ZooKeeper注册和配置中心</h1> |
| <p><a href="https://zookeeper.apache.org/">ZooKeeper</a> 是一个高可用的分布式协调系统,它也被广泛用于服务注册发现、服务配置等场景。 </p> |
| <p>Java Chassis 3 使用 <a href="https://curator.apache.org/docs/service-discovery">Curator Service Discovery Extensions</a> 实现注册发现。 </p> |
| <h2 id="_1">注册和配置基本原理</h2> |
| <p>使用ZooKeeper实现注册配置的原理比较简单,只需要将实例信息和配置信息作为合适的 key-value 对写入。注册场景使用下面的结构:</p> |
| <pre><code>servicecomb: |
| registry: |
| ${environment} |
| ${application}: |
| ${service}: |
| ${instance-id}: 详细的注册内容 |
| </code></pre> |
| <p>配置场景使用下面的结构:</p> |
| <pre><code>servicecomb: |
| config: |
| environment: |
| ${environment}: 详细的配置内容 |
| application: |
| ${environment}: |
| ${application}: 详细的配置内容 |
| service: |
| ${environment}: |
| ${application}: |
| ${service}: 详细的配置内容 |
| version: |
| ${environment}: |
| ${application}: |
| ${service}: |
| ${version}: 详细的配置内容 |
| tag: |
| ${environment}: |
| ${application}: |
| ${service}: |
| ${tag}: 详细的配置内容 |
| </code></pre> |
| <h2 id="_2">可靠性设计</h2> |
| <p>ZooKeeper自身被设计为一个高可靠的中间件,Java Chassis 3进一步增强了其作为注册中心的可靠性,即使在ZooKeeper自身不可用的情况下,仍然不影响服务之间的调用,详细了解这个机制,可以参考<a href="zone-isolation.html">Java Chassis 3技术解密:注册中心分区隔离</a>。 </p> |
| <p>为了验证这部分可靠性,可以设计一个简单的测试场景:</p> |
| <pre><code>测试工具 -> edge service -> consumer -> provider |
| </code></pre> |
| <p>启动 edge service、 consumer 和 provider, 通过测试工具请求接口。 然后停止 ZooKeeper, 并使用测试工具持续调用,可以发现这个过程中没有请求失败。 启动 Zookeeper, 服务注册信息恢复,这个过程中仍然没有请求失败。 </p> |
| <p>当然,在ZooKeeper不可用的过程中,无法注册新的实例。</p> |
| <h2 id="zookeeper">关于 Zookeeper 作为注册中心的深入讨论</h2> |
| <p>有观点认为, ZooKeeper不适合作为注册中心,一般的,CP系统都不适合作为注册中心,而AP作为注册中心才是最佳选择。 个人觉得这样的观点是片面而且非常不恰当的。 </p> |
| <p>从<a href="https://blog.csdn.net/looook/article/details/109168239?spm=1001.2014.3001.5501">ZooKeeper 并不适合做注册中心</a> 和 <a href="https://blog.csdn.net/u012921921/article/details/106521181/?utm_medium=distribute.pc_relevant.none-task-blog-2~default~baidujs_baidulandingword~default-1--blog-109168239.235^v43^pc_blog_bottom_relevance_base3&spm=1001.2101.3001.4242.">为什么我们要把服务注册发现改为阿里巴巴的Nacos而不用 ZooKeeper?</a> 摘取了几个核心观点(后面简称“观点文章”):</p> |
| <ul> |
| <li>网络分区隔离情况下,ZooKeeper会导致服务间调用错误,也会导致新的服务无法注册,不适合作为注册中心。</li> |
| <li>ZooKeeper所有写操作都在Leader进行,无法支持大规模微服务实例,不适合作为注册中心。</li> |
| </ul> |
| <p>下面简单讨论下这两个观点。</p> |
| <h3 id="_3">关于网络分区隔离</h3> |
| <p>网络分区隔离的场景比较多,在<a href="zone-isolation.html">Java Chassis 3技术解密:注册中心分区隔离</a>描述的场景下,Java Chassis能够保证服务之间的调用不受影响。在观点文章提到的场景中,Java Chassis也能够保证服务之间的调用不受影响,但是服务无法注册。网络分区隔离场景下,核心需要讨论的问题变成是否需要允许服务进行注册/扩容?尽管可能存在争议,但我们的观点是系统出现部分故障的情况下,系统不应该扩容,而是尽可能维持处理能力不变,这样会使得故障恢复更加可控,从而减少系统恢复时间。</p> |
| <p>观点文章提到的场景相对于实际部署场景还过于简单,我们把它扩展到实际场景:</p> |
| <p><img alt="" src="zookeeper-scale.png" /></p> |
| <p>实际场景除了保障单AZ内的请求闭环,还需要保证不同AZ的实例能够分担流量。当出现AZ网络隔离,由于每个AZ实例感知到的总的实例数减少,会触发弹性扩缩容,从而需要注册中心支持新实例注册。 但是本质上,这个场景系统的处理能力并没有降低,弹性扩缩容将会是一个错误的行为,这个错误的行为,会给系统资源的使用和故障恢复带来更多的不可预测因素。</p> |
| <h3 id="_4">关于性能</h3> |
| <p>ZooKeeper只有Leader可以写入,通过扩容Learner(Follower/Observer)提升读取性能。注册配置中心的场景实际上是一个读要求高,写要求不高的场景, ZooKeeper很好的满足了写不频繁,读很频繁的要求。 最复杂的业务系统,ZooKeeper管理的实例个数在10000以下,即使这些系统被设计为允许动态弹性扩缩容。超大规模的业务系统,一般微服务网关来提升系统韧性,并防止未知故障带来的爆炸半径扩大。 在前期<a href="interoperability.html">Java Chassis 3技术解密:与Spring Cloud的互操作</a>分享了架构韧性的一些内容。</p> |
| <p><img alt="" src="serialization-arch.png" /></p> |
| <p>因此,支持超大规模服务注册的场景,不具备大的现实意义。 关于超大规模实例管理的问题,可能更多来自于不恰当的架构设计或者微服务发现机制(比如早期Dubbo版本使用的基于接口的服务发现,实例个数和接口数量成正比)。</p> |
| <h2 id="_5">总结</h2> |
| <p>Java Chassis 3使用ZooKeeper作为注册中心是非常好的选择,ZooKeeper可以在应用系统中同时扮演注册、配置和选举等功能,能够极大的简化应用部署和服务依赖。CP一致性也使得常见故障场景下应用程序的行为具备更好的预测性。大规模系统可以采用微服务网关来提升系统韧性,降低系统爆炸半径。</p> |
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