Exam AWS Certified Solutions Architect - Associate SAA-C02 topic 1 question 494 discussion

A is correct. https://aws.amazon.com/kinesis/data-streams/faqs/#:~:text=Amazon%20Kinesis%20stores%20your%20data,CLI%20or%20the%20API%20call. Q: How do I change the data retention period of my Amazon Kinesis data stream? Amazon Kinesis stores your data for up to 24 hours by default. You can raise data retention period to up to 7 days by enabling extended data retention or up to 365 by enabling long-term data retention using the console, the CLI or the API call.

https://aws.amazon.com/kinesis/data-streams/faqs/ If the shards arent suffiecient, data streams will throw ProvisionedThroughputExceeded exception to producer and question does not talk about any error at the producer. Increasing the retention period from default would solve the issue only if the application did not process the data and store it to S3, which would imply to be an application error. That makes me believe Answer to be C.

B look make sense data missing and need fix the data processing logic. https://docs.aws.amazon.com/streams/latest/dev/shared-throughput-kcl-consumers.html#shared-throughput-kcl-consumers-overview

Answer A Set your data retention period to ensure that your consumers are able to read data before it expires, if problems occur. You should carefully consider all possibilities, such as an issue with your record processing logic or a downstream dependency being down for a long period of time. Think of the retention period as a safety net to allow more time for your data consumers to recover. The retention period API operations allow you to set this up proactively or to respond to operational events reactively. https://docs.aws.amazon.com/streams/latest/dev/kinesis-extended-retention.html

The key words are" - "every other day" = we have app consuming data from stream with 24h pauses (!!) - "kinesis streams with default parameters" - retention of data in stream is 24h so app running in every other day is missing part of data from stream. we need to rise retention perions. hence ANSWER A

Amazon Kinesis Data Streams supports changes to the data record retention period of your data stream. A Kinesis data stream stores records from 24 hours by default, up to 8760 hours (365 days). https://docs.aws.amazon.com/streams/latest/dev/kinesis-extended-retention.html

The default retention period for an AWS Kinesis stream is 24 hours. To ensure that your consumers are able to read stream data before it expires if any problems occur, you can extend your data retention period up to 168 hours (7 days).

The Question states "S3 in not getting all the data sent to KDS" which means that the issue should not be data inbound to the KDS but rather the EC2 consumers could have somehow miss some data for its processing prior sending the output to S3. As such, only increasing the data retention period for KDS allows more time for the EC2 consumers to poll the outstanding data which is missed out earlier.

Increase the retention period as the application is consuming the data every other day i.e. after 2 days and the stream only has the last 24 hours of data (default retention setting) So the answer is A

Ans is C ( shard has a sequence of data records in a stream)

I picked A. The default retention period is 24hrs for Kinesis. Therefore, if the application is only ingesting and pushing data every 2 days, it's only getting 1 day of data and effectively loosing the previous day's data. Question also specifically mentions default configuration.

correct answer is A, edit default setting

A As patriktre stated, default retention period for Kinesis Data Streams is 24hrs yet this applications consumes this data every other day.

Why not C???