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最大程度提高向集群添加节点后的 Elasticsearch 性能
通过向 Elasticsearch 集群添加节点,您能够扩展集群以完成大量工作负载。至为关键的一点是理解扩展 Elasticsearch 集群的最优方法,确保不会降低性能。
Elasticsearch 是一种快速且强大的搜索技术。随着数据量的增加,您需要充分利用 Elasticsearch 卓越的可扩展性。向集群添加更多节点后,您不仅能够增加集群可容纳的数据量,还能提高可同时处理的请求数量,并缩短返回结果所需的时间——通常情况下是如此。
如果整个周末都在努力调查为什么向 Elasticsearch 集群添加节点后,反而使得系统不稳定、宕机,人们越来越沮丧,而且公司营收减少,那可真有点糟糕。所以我们讨论一些常见配置,要是采用这些配置的话,扩展集群时可能会遇到巨大的性能瓶颈。
我们有一场特别棒的网络研讨会,叫做 Elasticsearch sizing and capacity planning(Elasticsearch 规模确定和容量规划)。其中定义了集群上的四大硬件资源:
- 计算 - 中央处理器 (CPU),集群能够以多快的速度完成工作。
- 存储 - 硬盘驱动器 (HDD) 或固态硬盘 (SSD),集群能够长期存储的数据量。
- 内存 - 随机存取存储器 (RAM),集群可同时完成的工作量。
- 网络 - 带宽,节点以多快的速度在彼此之间传输数据。
最常见的两个性能瓶颈是计算和存储。如果不够用,这会在极大程度上影响集群的数据节点。其他节点角色,例如主节点、采集节点或转换节点,是另一个单独的讨论主题。
注意:为简单起见,本文专注于扩展单个 Elasticsearch 集群。在共享硬件上运行多个集群会使复杂程度再上一个层级。
硬件资源的分配情况并不相同,具体取决于平台。例如,节点是硬件、虚拟机,还是基于容器的系统?
当添加 Elasticsearch 节点是增加容量时
添加专属的硬件节点
提高集群性能的最可靠方法是添加新硬件。添加新的专属硬件会增加所有四项主要资源。除了一种主要例外情况(稍后会讲解),添加新硬件节点都能提升集群性能。
在新主机上的虚拟机或容器中添加节点
无论是以虚拟机 (VM) 还是容器的形式添加节点,都是另外一种情况。当将新主机上的新节点分配给集群时,系统会授予更多硬件资源。更多的 CPU 核心,更多的 RAM,更多的存储,更多的总带宽。
对应用程序进行虚拟化(或容器化)的原因之一就是提高硬件利用率。这时,添加节点只会增加可供集群使用的硬件数量。随之而来的性能提升状况取决于共享资源的限额。
当添加节点是分配容量时
无论是使用 VM 还是容器分配硬件,Elasticsearch 节点最终都要共享硬件。这些考量因素适应于所有部署模型,包括 Elastic Cloud Enterprise (ECE) 和 Elastic Cloud on Kubernetes (ECK)。
造成计算瓶颈
使用虚拟机分配 CPU 通常是一种可预测的做法:为每个 VM 分配要使用几个核心。使用容器的话,CPU 共享状况就没有这么简单。
诸如 Kubernetes 等容器系统会以千分之一 CPU(又称作毫核)为单位来衡量 CPU 资源。请求和限额之间存在巨大区别。只定义请求的 CPU 的话,会允许容器最高使用主机 CPU 的 100%。但是,对 CPU 限制太多的话,会让昂贵的资源闲置。
> 提示:threadpools 开始时会使用 CPU 核心。使用容器的话,建议验证您的 threadpool 配置是否按照预期的方式工作。
在 Kubernetes 中,全部容器的 CPU 限额可能会超过可用的总硬件。这是基于以下假设:并非所有容器的 CPU 利用率都同时处于 100%。
考虑集群的最大吞吐量。在计算密集型工作负载中,节点在索引时通常需要所分配的全部 CPU 限额。最常见的索引密集型工作负载是大数据量的日志集群。
> 提示:决定 CPU 限额时,要同时考虑 CPU 利用率的峰值和典型值。同时还要考虑多大的 CPU 限制是可接受的。
造成存储瓶颈
很难预防存储瓶颈。因为存储是按照空间(而不是按照吞吐量)来分配的。当 Elasticsearch 节点的存储空间不足时,节点会达到低磁盘水印,并且会停止分片分配。
无论是 VM 还是容器,大部分平台都没有一种简单的方式来限制存储设备的利用率。对于每秒的输入/输出操作 (IOPS) 或读取/写入吞吐量,大部分环境并没有可配置的限额。即使推荐的 XFS 文件系统也只允许基于磁盘空间的磁盘配额。
没有限额的话,具有存储密集型工作负载的任何容器都可能使存储硬件饱和。这会让共享此硬件的其他节点无法使用硬件。对于大型部署,其/数据目录会发生错误。当多个节点将其/数据目录挂载到同一个存储区域网络 (SAN) 硬件时,来自所有节点的总吞吐量会让设备无法应对。
使用类似这样的容器配置,添加更多节点的确会向集群分配更多 CPU 和内存。但这会进一步分配既有的存储吞吐量。这会使得添加节点后,磁盘操作的时间变长,性能变差。
> 提示:当节点的存储吞吐量不够用时,一个早期预警信号是 CPU I/O 等待时间超过 10%。在 VM 或容器主机上可以找到这一指标,因为单独的容器并不会报告这一指标。
当添加节点毫无成效时
还有阻碍有效扩展的最后一个陷阱。即使添加实体硬件时,也会发生这一配置瓶颈。
由于分片数量不足,限制索引吞吐量
无论使用什么方法,添加节点都不会更改索引上的分片数量。如果某个索引有 2 个主分片和 1 个副本集,则总共有 4 个分片。在一个 4 节点集群上,为每个节点只设置一个分片是一种很好的方法,能够最大程度提高索引吞吐量。
随着入栈数据量的增加,我们向集群添加了另外 2 个节点。这表示集群总资源增加了 50%,但我们看到采集速率的提高百分比为 0%。为什么?
在这个例子中,新节点无法在索引时发挥作用,因为所有分片都已经分配完毕。如要让索引利用更多节点,则主节点数量也需要增加。如果您在单个集群内有多个活跃索引(这种情况很常见),则即使添加节点会增加集群的总吞吐量,但由于主分片数量有限,最活跃的索引仍然会受到限制。在规划容量时,为 Elasticsearch 选择正确的分片数量是很重要的一步。
所以,在上面的示例中,将主分片数量从 2 增加到 3,再考虑到每个分片 1 个副本,所以总分片数量为 6,可以在 6 个节点之间分配这些分片。
> 提示:设置 index.routing.allocation.total_shards_per_node [docs] 能够确保安全。然而,将这一限额设置过低会导致分片长期保持未分配状态。
结论
向 Elasticsearch 集群添加节点会改善性能吗?视情况而定。如果节点共享硬件,您需要注意共享资源瓶颈。两个常见的瓶颈是 CPU 和存储的利用率过高。您需要仔细规划,并采用良好的分片策略,这才能确保添加节点会提升性能。
在 Elastic Cloud 中运行的诸多优势之一是,我们的团队会专注于准确识别和解决这些类型的共享资源性能问题。欢迎立即开始试用云服务:https://www.elastic.co/cn/cloud/
同时,您可以观看 Elasticsearch sizing and capacity planning(Elasticsearch 规模确定和容量规划)网络研讨会,更深入地了解 Elasticsearch 的性能。