Workload Isolation in MongoDB DeploymentsMongoDB部署中的工作负载隔离

Operational Overview操作概述

MongoDB includes a number of features that allow database administrators and developers to isolate workload by functional or geographical groupings.MongoDB包括许多特性，允许数据库管理员和开发人员按功能或地理分组隔离工作负载。

This capability provides "data center awareness," which allows applications to target MongoDB deployments with consideration of the physical location of the mongod instances. 此功能提供了“数据中心感知”，允许应用程序针对MongoDB部署，同时考虑mongod实例的物理位置。MongoDB supports segmentation of operations across different dimensions, which may include multiple data centers and geographical regions in multi-data center deployments, racks, networks, or power circuits in single data center deployments.MongoDB支持跨不同维度的业务细分，这可能包括多数据中心部署中的多个数据中心和地理区域、单个数据中心部署中的机架、网络或电源电路。

MongoDB also supports workload isolation based on functional or operational parameters, to ensure that certain mongod instances are only used for reporting workloads or that certain high-frequency portions of a sharded collection only exist on specific shards.MongoDB还支持基于功能或操作参数的工作负载隔离，以确保某些mongod实例仅用于报告工作负载，或者分片集合的某些高频部分仅存在于特定分片上。

Specifically, with MongoDB, you can:具体来说，使用MongoDB，您可以：

• ensure write operations propagate to specific members of a replica set, or to specific members of replica sets.确保写入操作传播到副本集的特定成员或副本集的特定成员。
• ensure that specific members of a replica set respond to queries.确保副本集的特定成员响应查询。
• ensure that specific ranges of your shard key balance onto and reside on specific shards.确保你的分片键的特定范围在特定分片上保持平衡并驻留在特定分片上。
• combine the above features in a single distributed deployment, on a per-operation (for read and write operations) and collection (for chunk distribution in sharded clusters distribution) basis.在单个分布式部署中结合上述功能，基于每个操作（用于读写操作）和集合（用于分片集群分布中的块分布）。

For full documentation of these features, see the following documentation in the MongoDB Manual:有关这些功能的完整文档，请参阅MongoDB手册中的以下文档：

• Read Preferences, which controls how drivers help applications target read operations to members of a replica set.读取首选项，它控制驱动程序如何帮助应用程序将读取操作定向到副本集的成员。
• Write Concerns, which controls how MongoDB ensures that write operations propagate to members of a replica set.写关注点，它控制MongoDB如何确保写操作传播到副本集的成员。
• Replica Set Tags副本集标签, which control how applications create and interact with custom groupings of replica set members to create custom application-specific read preferences and write concerns.，它控制应用程序如何创建副本集成员的自定义分组并与之交互，以创建特定于应用程序的自定义读取首选项和写入关注点。
• Zones in sharded clusters, which allows MongoDB administrators to create zones that represent a group of shards and associate one or more ranges of shard key values to these zones. 分片集群中的区域，它允许MongoDB管理员创建表示一组分片的区域，并将一个或多个分片键值范围与这些区域关联。You can associate each zone with one or more shards in the cluster. 可以将每个分区与群集中的一个或多个分片相关联。A shard can associate with any number of zones. 分片可以与任意数量的区域关联。In a balanced cluster, MongoDB directs reads and writes covered by a zone only to the shards inside the zone.在平衡集群中，MongoDB只将区域覆盖的读写操作定向到区域内的分片。