[General] What is this "for" meaning?

[Andy Lin]

content:
One possible solution is to use an LRU algorithm that drops the Session ID "for" the oldest Session ID that has a pending 'Activate Session'. That way, the only way to........

I really don't know what this "for" meaning.
I tried to take a look this page: http://www.learnersdictionary.com/definition/for

and really not found a suitable explanation of it.

Thank you.

 

[Rover_KE]

10a – 'in place of'

 

[SoothingDave]

Provide more context.

 

[Andy Lin]

Here is the whole context.
One possible solution is to use an LRU algorithm that drops the Session ID "for" the oldest Session ID that has a pending 'Activate Session'. That way, the only way to 'permanently' use up slots is by activating and maintaining sessions for all session slots. A minor refinement may be to provide a few seconds of delay on returning the response to the Get Session Challenge in order to give opportunity for a well-behaved application to get a Challenge and return an Activate Session command before the errant software re-issued another Get Session Challenge.

website: https://imgur.com/a/mNfs52Y

 

[Andy Lin]

To RobertJ:

Thanks for your explanation.
In my interpretation, the oldest session ID is replaced by a new one.

BUT, why use "drop" instead of "take" or something verb?

If we changed this sentence into: One possible solution is to use an LRU algorithm that takes the Session ID "for" the oldest Session ID that has a pending 'Activate Session'.

This is much more clear, isn't it?

 

[jutfrank]

for = replacing it with