Subtle difference of v3 and v4 regarding exclusion performance

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From: Fritz Elfert <[email protected]>
To: [email protected]
Message-ID: <[email protected]>
Subject: Subtle difference of v3 and v4 regarding exclusion performance

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I just have upgraded my local server to Fedora 26 which included an
uprade of BackupPC v3 to BackupPC 4.1.3.

Unfortunately, I experience a subtle difference of the file exclusion
mechanism which hits me hard performancewise.

With old BackupPC (cannot prove anymore) as well as with a
manual test like

rsync -av --exclude=3D/home/felfert/.m2/repository target:/home .

On the target (in rsync terms: server), the specified directory is
simply skipped which takes just millisecs.

With BackupPC 4.3.1, the directory is missing in the resultin backup (as
expected).
However: The whole hierarchy below /home/felfert/.m2/repository is still
recursively read on the target which takes ages (in my case ~2hours) and
also puts quite some load on the target.

This is a huge performance degradation compared to v3.

Can somebody confirm this or do I have overlooked some necessary change
(ragading v3 -> v4 migration) in the config?

-Fritz



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