I need to check md5 checksum of ~10-20 files on server every time a user logs in. Each file can be ~10MB. Should I cache md5 of these files or do it in real-time without wasting time & bothering?
P. S. there will probably be up to 10k logins a day.
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are the 10-20 files same for all users? or each user will have their own set of files? – Dileep Kumar Jul 12 '17 at 10:08
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files are same for all users – Gintas_ Jul 12 '17 at 10:24
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Why exactly do you need to do this…? Perhaps there's a much better overall approach to begin with. – deceze Jul 12 '17 at 11:49
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That depends on the requirements, checking a cached value is not the same as getting a file checksum.
So based on the first sentence - I need to check md5 checksum of ~10-20 files - no, you cannot cache it.
However, if you just need to display a checksum, then yes, you can and should cache it and check the file-integrity periodically with a cron-job if necessary.
jeroen
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these files aren't modifiable by users, so they are the same for everyone. – Gintas_ Jul 12 '17 at 10:26
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If the files are same for all users, then in that case I would suggest you to cache the md5 of file so that each time you need not to get the file md5 and get it simply from cache.
Dileep Kumar
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