在 dynamodb 中，使用发电机流 + lambda 触发器与运动流 + lambda 触发器有什么区别？

Question

I am looking into dynamo db streaming options. There are 2:

1. Dynamo streams
2. Kinesis streams

Dynamo streams can have a lambda trigger that will consume the stream.

Kinesis streams can also have the lambda trigger that will consume the stream.

In both above cases, in the lambda settings we can choose the batch size.

In dynamodb, what is the difference between using dynamo streams + lambda trigger versus kinesis streams + lambda trigger?

Answer 1

Below is some of the key differences between Kinesis Data Streams and DynamoDB Streams. In regards to your question around a Lambda consumer, the important details to you is data retention, ordering, de-duplication and number of allowed consumers.

Properties	Kinesis Data Streams for DynamoDB	DynamoDB Streams
Data retention	Up to 1 year.	24 hours.
Kinesis Client Library (KCL) support	Supports KCL versions 1.X and 2.X.	Supports KCL version 1.X.
Number of consumers	Up to 5 simultaneous consumers per shard, or up to 20 simultaneous consumers per shard with enhanced fan-out.	Up to 2 simultaneous consumers per shard.
Throughput quotas	Unlimited.	Subject to throughput quotas by DynamoDB table and AWS Region.
Record delivery model	Pull model over HTTP using GetRecords and with enhanced fan-out, Kinesis Data Streams pushes the records over HTTP/2 by using SubscribeToShard.	Pull model over HTTP using GetRecords.
Ordering of records	The timestamp attribute on each stream record can be used to identify the actual order in which changes occurred in the DynamoDB table.	For each item that is modified in a DynamoDB table, the stream records appear in the same sequence as the actual modifications to the item.
Duplicate records	Duplicate records might occasionally appear in the stream.	No duplicate records appear in the stream.
Stream processing options	Process stream records using AWS Lambda, Kinesis Data Analytics, Kinesis data firehose, or AWS Glue streaming ETL.	Process stream records using AWS Lambda or DynamoDB Streams Kinesis adapter.
Durability level	Availability zones to provide automatic failover without interruption.	Availability zones to provide automatic failover without interruption.