IoT sensors monitor the number of bags that are handled at an airport. The data is sent back to a Kinesis stream with default settings. Every alternate day, the data from the stream is sent to S3 for processing. But it is noticed that S3 is not receiving all of the data being sent to the Kinesis stream. What could be the reason for this?

Answer options:

A.The sensors probably stopped working on somedays, hence data is not sent to the stream.
B.S3 can only store data for a day.
C.The default retention period of the data stream is set to 24 hours only, and hence the failure.
D.Kinesis streams are not meant to handle IoT related data.

Correct Answer – C
Kinesis Streams support changes to the data record retention period of your stream. A Kinesis stream is an ordered sequence of data records, meant to be written to and read in real-time. Data records are therefore stored in shards in your stream temporarily. When a record is added to when it is no longer accessible, the time period is called the retention period. A Kinesis stream stores the records from 24 hours (by default) up to 168 hours.
Option A is incorrect, even though a possibility cannot be considered as the right option.
Option B is incorrect since S3 can store data indefinitely unless you have a lifecycle policy defined.
Option D is incorrect because the Kinesis service is perfect for this sort of data ingestion.
For more information on Kinesis data retention, please refer to the URL below.
http://docs.aws.amazon.com/streams/latest/dev/kinesis-extended-retention.html