A user has enabled session stickiness with ELB. The user does not want ELB to manage the cookie; instead he wants
the application to manage the cookie. What will happen when the server instance, which is bound to a cookie, crashes?
A.
The response will have a cookie but stickiness will be deleted
B.
The session will not be sticky until a new cookie is inserted
C.
ELB will throw an error due to cookie unavailability
D.
The session will be sticky and ELB will route requests to another server as ELB keeps replicating the Cookie
Explanation:
With Elastic Load Balancer, if the admin has enabled a sticky session with application controlled stickiness, the load
balancer uses a special cookie generated by the application to associate the session with the original server which
handles the request. ELB follows the lifetime of the application-generated cookie corresponding to the cookie name
specified in the ELB policy configuration. The load balancer only inserts a new stickiness cookie if the application
response includes a new application cookie. The load balancer stickiness cookie does not update with each request. If
the application cookie is explicitly removed or expires, the session stops being sticky until a new application cookie is
issued.
B
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This makes it sound like D is correct or at least a more correct answer than B.
If an instance fails or becomes unhealthy, the load balancer stops routing requests to that instance, and chooses a new healthy instance based on the existing load balancing algorithm. The load balancer treats the session as now “stuck” to the new healthy instance, and continues routing requests to that instance even if the failed instance comes back.
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http://docs.aws.amazon.com/elasticloadbalancing/latest/classic/elb-sticky-sessions.html
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D
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B
http://jayendrapatil.com/aws-elastic-load-balancing/
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Hi Ying, this is from your link:
Application-Controlled Session Stickiness
The load balancer uses a special cookie to associate the session with the instance that handled the initial request, but follows the lifetime of the application cookie specified in the policy configuration. The load balancer only inserts a new stickiness cookie if the application response includes a new application cookie. The load balancer stickiness cookie does not update with each request.
==> If the application cookie is explicitly removed or expires, the session stops being sticky until a new application cookie is issued. <==
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B
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B
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