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NO.1 Which of these techniques enables the fastest possible rollback times in the event of a failed
deployment?
A. Blue-Green
B. Rolling; Immutable
C. Canary or A/B
D. Rolling; Mutable
Answer: A
AWS-DevOps Check AWS-DevOps Content
Explanation:
AWS specifically recommends Blue-Green for super-fast, zero-downtime deploys - and thus rollbacks,
which are redeploying old code.
You use various strategies to migrate the traffic from your current application stack (blue) to a new
version
of the application (green). This is a popular technique for deploying applications with zero downtime.
Reference: https://d0.awsstatic.com/whitepapers/overview-of-deployment-options-on-aws.pdf
NO.2 Your system uses a multi-master, multi-region DynamoDB configuration spanning two regions
to achieve
high availablity. For the first time since launching your system, one of the AWS Regions in which you
operate over went down for 3 hours, and the failover worked correctly. However, after recovery,
your
users are experiencing strange bugs, in which users on different sides of the globe see different data.
What is a likely design issue that was not accounted for when launching?
A. The system did not use DynamoDB Consistent Read requests, so the requests in different areas are
not utilizing consensus across Regions at runtime.
B. The system does not have Lambda Functor Repair Automatons, to perform table scans and chack
for
corrupted partition blocks inside the Table in the recovered Region.
C. The system did not implement DynamoDB Table Defragmentation for restoring partition
performance in
the Region that experienced an outage, so data is served stale.
D. The system did not include repair logic and request replay buffering logic for post-failure, to
re-synchronize data to the Region that was unavailable for a number of hours.
Answer: D
AWS-DevOps Solution
Explanation:
When using multi-region DynamoDB systems, it is of paramount importance to make sure that all
requests made to one Region are replicated to the other. Under normal operation, the system in
question
would correctly perform write replays into the other Region. If a whole Region went down, the
system
would be unable to perform these writes for the period of downtime. Without buffering write
requests
somehow, there would be no way for the system to replay dropped cross-region writes, and the
requests
would be serviced differently depending on the Region from which they were served after recovery.
Reference:
http://docs.aws.amazon.com/amazondynamodb/latest/developerguide/Streams.CrossRegionRepl.ht
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