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文档中心弹性 MapReduce EMR 开发指南 Alluxio 开发指南在腾讯云中使用 Alluxio 文档

在腾讯云中使用 Alluxio 文档

最近更新时间：2023-07-14 15:14:56

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本页目录：

概述
在腾讯云 EMR 上提供了开箱可用的 Alluxio 服务，以帮助腾讯云客户可以快速实现分布式内存级缓存加速、简化数据管理等。同时还可以通过腾讯云 EMR 控制台或 API 接口，使用配置下发功能，快速配置多层级缓存和元数据管理等，获取一站式监控告警等功能。
准备
腾讯云 EMR 的 Hadoop 标准版本2.1.0版本及以上。
有关 EMR 支持具体的 Alluxio 的版本，可参考 组件版本。
创建基于 Alluxio 的 EMR 集群
本节主要说明如何在腾讯云 EMR 上创建开箱即用的 Alluxio 集群。EMR 创建集群提供了购买页创建和 API 创建两种方式。
购买页创建集群
您需要登录腾讯云 EMR 购买页，在购买页选择支持的 Alluxio 发布版本，并且在可选组件列表中勾选 Alluxio 组件。
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其他的选项可根据业务具体场景，进行个性化配置，创建过程中的具体选项可参考 创建 EMR 集群。
API 创建集群
腾讯云 EMR 还提供了 API 方式构建基于 Alluxio 的大数据集群。具体可参考 查询硬件节点信息。
基础配置
创建一个带 Alluxio 组件的腾讯云 EMR 集群，默认会把 HDFS 挂载到 Alluxio 上，并使用内存作为单层 level0 存储。如果有需要更改更符合业务特性的多级存储，或者其他对应优化项，可以使用配置下发功能来完成相关配置。
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在配置下发后，部分配置需要重启 Alluxio 服务才能生效。
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更多配置下发和重启策略细节，可参考 配置下发 和 重启组件。
基于 Alluxio 加速计算存储分离
腾讯云 EMR 基于腾讯云对象存储（COS）提供了计算存储分离能力，默认直接访问对象存储中的数据时，应用程序没有节点级数据本地性或跨应用程序缓存。使用 Alluxio 加速将缓解这些问题。
在腾讯云 EMR 集群上默认已部署使用 COS 作为 UFS 的依赖 jar 包，只需授予访问 COS 的权限，并把 COS mount 到 Alluxio 上即可使用。
授权
若当前集群未开启对象存储，可在 访问管理控制台 > 角色 中进行授权，授权后 EMR 中节点可以通过临时密钥访问 COS 中数据。
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Mount
登录到 EMR 任意一台机器，挂载 COS 到 Alluxio。
alluxio fs mount <alluxio-path> <source-path>
更多在腾讯云 EMR 中使用 Alluxio 开发细节，可查阅 Alluxio 开发文档。

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