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Making fsfs generate unique transaction names

From: Blair Zajac <blair_at_orcaware.com>
Date: 2007-06-14 00:25:28 CEST

I'm making a svn filesystem network aware using Ice RPC and one of the
things I'm running into is that FSFS transactions are not unique. BDB
seems to generate transaction names via a sequence, so this isn't an issue.

I have the ability for a client to begin a transaction remotely and then
refer to that transaction to do work. In FSFS, if a client begins a
transaction, gives the transaction name to another process, which then
closes it, and a third process begins a new transaction based on the
same revision, then it will get the same transaction name and the owner
of the original transaction will be operating inside a different
transaction and will be able to abort the transaction, which it should
not be able to do.

So I'd like to make the transaction names unique, using something like

"%s-%05ds-%s-%05d" % (apr_gethostname(),

where i is incremented until it finds a non-existent directory name.

The current transaction name is based off the revision number, is this
necessary? Should we keep it? Does changing the transaction name have
any other impact?


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Received on Thu Jun 14 00:25:41 2007

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