What could be the reason for this?

A company installed sensors to track the number of people who visit the park. The data is sent every day to an Amazon Kinesis stream with default settings for processing, in which a consumer is configured to process the data every other day. You noticed that the S3 bucket is not receiving all of the data that is being sent to the Kinesis stream. You checked the sensors if they are properly sending the data to Amazon Kinesis and verified that the data is indeed sent every day .

What could be the reason for this?
A . There is a problem in the sensors. They probably had some intermittent connection hence, the data is not sent to the stream.
B . By default, the data records are only accessible for 24 hours from the time they are added to a Kinesis stream.
C . By default, Amazon S3 stores the data for 1 day and moves it to Amazon Glacier.
D . Your AWS account was hacked and someone has deleted some data in your Kinesis stream.

View Answer

Answer: B

Explanation:

Kinesis Data Streams supports changes to the data record retention period of your stream. A Kinesis data stream is an ordered sequence of data records meant to be written to and read from in real-time. Data records are therefore stored in shards in your stream temporarily.

The time period from when a record is added to when it is no longer accessible is called the retention period. A Kinesis data stream stores records from 24 hours by default to a maximum of 8760 hours (365 days).

This is the reason why there are missing data in your S3 bucket. To fix this, you can either configure your sensors to send the data everyday instead of every other day or alternatively, you can increase the retention period of your Kinesis data stream.

The option that says: There is a problem in the sensors. They probably had some intermittent connection hence, the data is not sent to the stream is incorrect. You already verified that the sensors are working as they should be hence, this is not the root cause of the issue.

The option that says: By default, Amazon S3 stores the data for 1 day and moves it to Amazon Glacier is incorrect because by default, Amazon S3 does not store the data for 1 day only and move it to Amazon Glacier.

The option that says: Your AWS account was hacked and someone has deleted some data in your Kinesis stream is incorrect. Although this could be a possibility, you should verify first if there are other more probable reasons for the missing data in your S3 bucket. Be sure to follow and apply security best practices as well to prevent being hacked by someone.

By default, the data records are only accessible for 24 hours from the time they are added to a Kinesis

stream, which depicts the root cause of this issue.

Explanation:

Reference:

http://docs.aws.amazon.com/streams/latest/dev/kinesis-extended-retention.html

Check out this Amazon Kinesis Cheat Sheet:

https://tutorialsdojo.com/amazon-kinesis/