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Exam AWS-SysOps topic 1 question 550 discussion

Exam question from Amazon's AWS-SysOps
Question #: 550
Topic #: 1
[All AWS-SysOps Questions]

An application is running on Amazon EC2 instances behind a Classic Load Balancer. The instances run in an Auto Scaling group across multiple Availability
Zones. Occasionally multiple incoming requests will receive a 5xx HTTP response when making a request to the Classic Load Balancer. From the Amazon
CloudWatch metrics, a SysOps Administrator observes the Elastic Load Balancing (ELB) SpillOverCount metric to be greater than zero during these occasions.
These errors can be avoided by triggering scaling actions on which ELB metric?

  • A. HealthyHostCount
  • B. BackendConnectionErrors
  • C. SurgeQueueLength
  • D. UnHealthyHostCount
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Suggested Answer: C 🗳️
by saumenP at Oct. 29, 2019, 9:33 a.m.
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saumenP
Highly Voted 2 years, 7 months ago
C is correct
upvoted 7 times
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karmaah
Highly Voted 2 years, 7 months ago
https://aws.amazon.com/premiumsupport/knowledge-center/elb-capacity-troubleshooting/
upvoted 6 times
DrewL
2 years, 6 months ago
yes, this doc explains this question very well.
upvoted 1 times
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albert_kuo
Most Recent 10 months ago
Selected Answer: C
The SurgeQueueLength metric represents the number of requests that are waiting in the load balancer's queue for a healthy instance to become available. When the SurgeQueueLength increases, it indicates that the load on the instances is high, and the load balancer is unable to immediately distribute the incoming requests to healthy instances. This can result in the occurrence of 5xx HTTP response errors. By monitoring the SurgeQueueLength metric and triggering scaling actions when it exceeds a certain threshold, you can dynamically adjust the capacity of your Auto Scaling group to handle the increased load. This can help prevent the occurrence of errors and ensure that the application remains responsive.
upvoted 1 times
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TroyMcLure
2 years, 6 months ago
Correct Answer: C
upvoted 1 times
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abhishek_m_86
2 years, 6 months ago
C. SurgeQueueLength
upvoted 1 times
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sen12
2 years, 6 months ago
When requests exceed the maximum SurgeQueueLength, the SpilloverCount metric starts to measure rejected requests. The maximum SurgeQueueLength is 1024.
upvoted 1 times
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