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Re^7: Splitting up a filesystem into 'bite sized' chunks

by BrowserUk (Pope)
on Jul 10, 2013 at 21:46 UTC ( #1043573=note: print w/replies, xml ) Need Help??

in reply to Re^6: Splitting up a filesystem into 'bite sized' chunks
in thread Splitting up a filesystem into 'bite sized' chunks

and combining it with File::Find::prune to "skip forwards".

I have no experience (nor knowledge even) of that, so I cannot comment on it.

I'm not really sure why I'm resisting databases,

It wouldn't have to be (nor benefit from) being a full RDBMS, but it would need to be able to handle low levels of read contention and a concurrent writer.

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Re^8: Splitting up a filesystem into 'bite sized' chunks
by Preceptor (Deacon) on Jul 10, 2013 at 22:59 UTC

    File::Find let's you specify "prune" which enables or disables traversal. If you know your last checkpoint is /mnt/myhome/stuff/junk you can pattern match your file path, and turn off traversal until you get a match. (you may have to roll up your checkpoint a little if the target has been deleted in the interim).

    That'll - hopefully - give me a restartable find. Being able to "skip head" in future (and thus distribute processing) may require a first pass, and tracking multiple checkpoints.

    Thinking about it, some sort of start/finish and some way of compensating for "drift". But one checkpoint every 100k files takes a huge list down to merely large. (but still doesn't help your first pass, unless you can take some wild guesses for initial checkpoints and do that same drift compensation.)

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