Re: backup manifests - Mailing list pgsql-hackers

From Rushabh Lathia
Subject Re: backup manifests
Date
Msg-id CAGPqQf2UwMMO1kd1wVSwvuCvcPf4LgKwmyYKcU1-AtEiQ1Okrg@mail.gmail.com
Whole thread Raw
In response to Re: backup manifests  (Robert Haas <robertmhaas@gmail.com>)
Responses Re: backup manifests  (Robert Haas <robertmhaas@gmail.com>)
Re: backup manifests  (Jeevan Chalke <jeevan.chalke@enterprisedb.com>)
List pgsql-hackers


On Fri, Dec 6, 2019 at 1:44 AM Robert Haas <robertmhaas@gmail.com> wrote:
On Thu, Dec 5, 2019 at 11:22 AM Rushabh Lathia <rushabh.lathia@gmail.com> wrote:
> Here is the whole stack of patches.

I committed 0001, as that's just refactoring and I think (hope) it's
uncontroversial. I think 0002-0005 need to be squashed together
(crediting all authors properly and in the appropriate order) as it's
quite hard to understand right now,

Please find attached single patch and I tried to add the credit to all
the authors.

There is one review comment from Jeevan Chalke, which still pending
to address is:

4.
Why we need a "File" at the start of each entry as we are adding files only?
I wonder if we also need to provide a tablespace name and directory marker so
that we have "Tablespace" and "Dir" at the start.

Sorry, I am not quite sure about this, may be Robert is right person
to answer this.

and that Suraj's patch to validate
the backup should be included in the patch stack. It needs
documentation. Also, we need, either in that patch or a separate, TAP
tests that exercise this feature. Things we should try to check:

- Plain format backups can be verified against the manifest.
- Tar format backups can be verified against the manifest after
untarring (this might be a problem; not sure there's any guarantee
that we have a working "tar" command available).
- Verification succeeds for all available checksums algorithms and
also for no checksum algorithm (should still check which files are
present, and sizes).
- If we tamper with a backup by removing a file, adding a file, or
changing the size of a file, the modification is detected even without
checksums.
- If we tamper with a backup by changing the contents of a file but
not the size, the modification is detected if checksums are used.
- Everything above still works if there is user-defined tablespace
that contains a table.

--
Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company


Thanks.
Rushabh Lathia

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