在Google App Engine上更新数据存储中的大量实体 [英] Updating a large number of entities in a datastore on Google App Engine

问题描述

我想对特定类型的所有实体执行一个小操作，并将它们重写到数据存储区。我目前有两万个这样的实体，但是想要一个可以扩展到任意数量的解决方案。

我有什么选择？

解决方案

使用 mapper - 这是MapReduce框架的一部分，但您只需要第一个组件map，因为如果您只是简单地修改数据存储区，则不需要shuffle / reduce步骤实体。

I would like to perform a small operation on all entities of a specific kind and rewrite them to the datastore. I currently have 20,000 entities of this kind but would like a solution that would scale to any amount.

What are my options?

解决方案

Use a mapper - this is part of the MapReduce framework, but you only want the first component, map, as you don't need the shuffle/reduce step if you're simply mutating datastore entities.

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