A company's static website hosted on Amazon S3 was launched recently, and is being used by tens of thousands of users. Subsequently, website users are experiencing 503 service unavailable errors. Why are these errors occurring?
A.
The request rate to Amazon S3 is too high.
B.
There is an error with the Amazon RDS database.
C.
The requests to Amazon S3 do not have the proper permissions.
D.
The users are in a different geographical region and Amazon Route 53 is restricting access.
A -
"An HTTP 503 error indicates that one or more data nodes in the cluster is overloaded, and the node doesn't have enough capacity to handle the request. ... Tip: You can use the RequestCount Amazon CloudWatch metric to track HTTP response codes."
https://aws.amazon.com/premiumsupport/knowledge-center/elasticsearch-http-503-errors/#:~:text=An%20HTTP%20503%20error%20indicates,capacity%20to%20handle%20the%20request.&text=Tip%3A%20You%20can%20use%20the,to%20track%20HTTP%20response%20codes.
Amazon S3 has service limits that define the maximum request rate that can be handled by a bucket. If the request rate exceeds these limits, it can result in 503 service unavailable errors. This issue commonly occurs when a large number of users are simultaneously accessing the website, causing a sudden surge in requests.
A- Correct ( 5xx - Server side error)
B- Incorrect Issue is at object storage level
C- Incorrect ( It is not client side error)
D- Incorrect ( Cloudfront can take care of that)
Impt Point :
In rare cases, it indicates that CloudFront temporarily can't satisfy a request because of limited resources at an edge location.
Origin Server Does Not Have Enough Capacity to Support the Request Rate
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