Troubleshooting Kinesis Data Firehose Failure

Answer: D.

Option A is incorrect.

The maximum memory setting for lambda is 3 GB.

Using the maximum memory would not cause Firehose to fail to write to S3

It will increase the cost of your solution.

However, since per the AWS documentation, “Lambda allocates CPU power linearly in proportion to the amount of memory configured.”

Option B is incorrect.

Your S3 bucket used by Kinesis Data Firehose to output your data must be in the same region as your Firehose.

Since they are in the same region, this would not cause a failure to write to the S3 bucket.

Option C is incorrect.

The Kinesis Data Firehose documentation states that “Kinesis Data Firehose buffers incoming data before delivering it to Amazon S3

You can choose a buffer size (1-128 MBs) or buffer interval (60-900 seconds)

The condition that is satisfied first triggers data delivery to Amazon S3.” Using the default setting would not prevent Firehose from writing to S3.

Option D is correct.

The lambda timeout value default is 3 seconds.

For many Kinesis Data Firehose implementations, 3 seconds is not enough time to execute the transformation function.

Reference:

Please see the Amazon Kinesis Data Firehose developer guide documentation titled Configure Settings, the Amazon Kinesis Data Firehose developer guide documentation titled Amazon Kinesis Data Firehose Data Transformation, and the AWS Lambda developer guide documentation titled AWS Lambda Function Configuration.

Based on the information provided, it is difficult to determine the exact cause of the issue. However, we can analyze each option and its potential impact on the Kinesis Data Firehose and S3 data lake pipeline.

Option A: Your lambda memory setting is set to the maximum value allowed.

The memory setting of a lambda function determines the amount of memory allocated to the function. If the function requires more memory than what is allocated, it can lead to performance issues or even function failure. However, the memory setting is unlikely to be the cause of the issue since the question is focused on the Kinesis Data Firehose and S3 pipeline and not the lambda function.

Option B: Your S3 bucket is in the same region as your Kinesis Data Firehose.

This is an important requirement for the Kinesis Data Firehose to write data to an S3 bucket. If the S3 bucket is not in the same region as the Kinesis Data Firehose, the pipeline will fail. However, since the question states that the pipeline was configured to write to the S3 data lake, it is unlikely that this is the cause of the issue.

Option C: Your Kinesis Data Firehose buffer setting is set to the default value.

The Kinesis Data Firehose buffer setting determines the amount of data that can be buffered before being written to the destination. If the buffer size is too small, it can cause the pipeline to become slow or even fail. However, it is unlikely that this is the cause of the issue since a default buffer size is usually sufficient for most use cases.

Option D: Your lambda timeout value is set to the default value.

The timeout value of a lambda function determines the maximum amount of time that the function can run before it is terminated. If the function takes longer than the timeout value to complete, it can cause the pipeline to become slow or even fail. However, similar to option A, the timeout value is unlikely to be the cause of the issue since the question is focused on the Kinesis Data Firehose and S3 pipeline and not the lambda function.

In conclusion, based on the information provided, it is difficult to determine the exact cause of the issue. However, options A, C, and D are unlikely to be the cause of the issue. Option B is an important requirement for the pipeline to work, but since the pipeline was configured to write to the S3 data lake, it is unlikely to be the cause of the issue.