Dynamodb 缺少并发请求的更新? [英] Dynamodb missing updates with concurrent requests?

问题描述

我无法一次多次更新单个项目.如果我尝试像这样多次更新具有新属性的项目:

I'm having trouble updating a single item many times at once. If I try to update an item with new attributes many times like so:

UpdateExpression: 'SET attribute.#uniqueId = :newAttribute'

并非所有更新都通过.我尝试发送 20 个具有唯一 ID 的更新，结果只有 15 个新属性.这也发生在我的本地 dynamodb 实例中.我假设更新以某种方式在最后一次更新获胜"中相互覆盖.情景，但我不确定.我该如何解决这个问题?

not all of the updates go through. I tried sending 20 updates with unique ids and this resulted in only 15 new attributes. This also occurs in my local dynamodb instance. I assume that the updates are somehow overwriting each other in a "last update wins" scenario but I'm not sure. How can I solve this?

推荐答案

DynamoDB 在更新时最终是一致的，所以竞争条件"是可能的.如果您想要更严格的写入逻辑，请查看 transactions

DynamoDB is eventually consistent on update, so "race conditions" are possible. If you want more strict logic in writes, take a look at transactions

项目在事务期间未锁定.DynamoDB 事务提供可序列化的隔离.如果项目在交易在交易进行时，交易是取消并引发异常，其中包含有关哪个项目或items 导致了异常.

Items are not locked during a transaction. DynamoDB transactions provide serializable isolation. If an item is modified outside of a transaction while the transaction is in progress, the transaction is canceled and an exception is thrown with details about which item or items caused the exception.

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