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Interview Question
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I attended one interview today,Interviewer asked me one question regarding the creation of unique identifier.
Question :
Consider same webapplication is deployed in 3 webserver.if any user registered in any of my application,a unique identifer is given to the user.It cannot be stored in a database.3 webserver should not produce the same uid again.How t implement this ?
Question :
Consider same webapplication is deployed in 3 webserver.if any user registered in any of my application,a unique identifer is given to the user.It cannot be stored in a database.3 webserver should not produce the same uid again.How t implement this ?
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Join Date: Aug 2008
Posts: 83
Reputation: 
Solved Threads: 18
Junior Poster in Training
Since there is no database is available, you could always check with the other web servers before using a UID. There could be two ways of implementing this:
- either each server keeps track of every UID used (synchronization errors could occur), or
- each server keeps a list of its own UID's (would longer to generate a UID, and if one server goes offline there could be problems)
- either each server keeps track of every UID used (synchronization errors could occur), or
- each server keeps a list of its own UID's (would longer to generate a UID, and if one server goes offline there could be problems)
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