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Re: APR hash order

From: Philip Martin <philip.martin_at_wandisco.com>
Date: Tue, 21 Feb 2012 13:13:48 +0000

Daniel Shahaf <danielsh_at_elego.de> writes:

> Philip Martin wrote on Tue, Feb 21, 2012 at 12:32:43 +0000:
>> The dumpfile order is more interesting. Although we don't specify the
>> dumpfile order until now it has been repeatable, at least when using the
>> same executable/libraries. I can see that this repeatability is useful
>> to an administrator. Rather than fixing the testsuite to ignore
>> dumpfile order changes perhaps we should remove the random behaviour and
>> continue to provide repeatable dumpfiles? This would involve using
>> apr_hash_make_custom rather than apr_hash_make. I don't know whether
>
> Instead of apr_hash_make_custom(), couldn't we dump entries in directory
> order instead? That makes the order a function of the repository mirror
> dumped, rather than of the software version used.
>
> For FSFS dirs are stored in an svn_hash_write2() hash; for BDB they are
> stored in a skel of node-rev skels; both of these structures are
> naturally ordered, though in the former case we discard the order when
> we parse the rep.

That might be possible. There may be other hashes beyond the directory
entries, I guess the properties associated with a node might be in hash
order. Making the directory order repeatable only really makes sense if
we end up with a dumpfile that is identical.

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Received on 2012-02-21 14:14:33 CET

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