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Re: Sharded FSFS repositories - summary

From: John Szakmeister <john_at_szakmeister.net>
Date: 2007-03-15 11:21:41 CET

Malcolm Rowe wrote:
> On Wed, Mar 14, 2007 at 08:54:14AM +0100, Ph. Marek wrote:
>> On Tuesday 13 March 2007 15:34, Malcolm Rowe wrote:
>>> But neither of those are the main reason to do this. (realistically,
>>> how many times a month will a typical admin do an 'ls' in revs/ ?)
>>>
>>> 4000 revs is a good compromise: it's big enough that it scales to large
>>> repositories (ASF's repository would be halfway towards needing another
>>> level if we went with 1000 files-per-shard), and it's small enough that
>>> it works everywhere we need it to (even on Coda, it seems :-)).
>> Well, with 4000 you don't know where r454513 is, do you?
>
> Yes, you do, if you use a calculator.
>
> Again, I'm not sure exactly what use case you're thinking about that
> requires admins to look for revision files so regularly :-)

It's not that it'll require them to look at them regularly. It that
when there is an issue, the admin needs to be able to track it down
under stress... so it would be best if the mapping was more intuitive,
and didn't require you to remember any magic numbers or a formula for
computing the location.

-John

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Received on Thu Mar 15 11:22:06 2007

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