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Re: win_acls changes trigger creation of increments


From: Eric L. Zolf
Subject: Re: win_acls changes trigger creation of increments
Date: Thu, 22 Apr 2021 07:22:30 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.8.1

Hi,

On 22/04/2021 05:15, Robert Nichols wrote:
On 4/21/21 12:08 PM, Patrik Dufresne wrote:
[snip]
1. I'm not aware of any changes in the logic between 1.2.8 and 2.0.5
regarding Win_acls. So I'm expecting this to be an issue in 2.0.5. Is it ?
2. Would we consider this normal behavior to create increments (empty
increment) when the only changes are metadata changes ?

It's been that way since forever, and it's not unique to Windows ACLs.
Changes that affect only file metadata cause these "zero-diff" files to
be created, and since they are compressed, they are not empty files but
actually occupy a disk block. Places like /usr/src/kernels and
/var/lib/yum/yumdb, which make extensive use of hard links, cause
thousands of these files to be generated every time there is an update.
I wrote a rather messy audit to get rid of them, and the first time I
ran it resulted in over 4,000,000 files being deleted.

What Robert just wrote. We could possibly optimize the recognition that a file content didn't change, avoiding some data churning (and perhaps even empty compressed files) but that would be an enhancement.

KR, Eric



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