Discussion:
Prevent writings before dropping a collection
(too old to reply)
t***@sanoia.com
2018-11-26 22:36:12 UTC
Permalink
Hello!

I have a huge logs collection on my database, and what I need to do is :

1) Dump it to a backup file
2) Drop it
3) Everyday, dump the new entries to backup files

So it's basically incremental backup, but I've got the basic installation,
so no ReplicaSet, no nothing

To prevent writings between 1) and 2), I put a fsyncLock on the database,

But I realized that it prevents the dropping of the database.

*Is there a way to block writings to the DB so that there's nothing written
between the dump and the drop (I would lose them otherwise).*

I've looked everywhere, but as usual no fitting answer...

Thank you in advance
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Oleg Toropov
2018-11-27 14:43:59 UTC
Permalink
How about to temporally revoke users rights to write?
Post by t***@sanoia.com
Hello!
1) Dump it to a backup file
2) Drop it
3) Everyday, dump the new entries to backup files
So it's basically incremental backup, but I've got the basic installation,
so no ReplicaSet, no nothing
To prevent writings between 1) and 2), I put a fsyncLock on the database,
But I realized that it prevents the dropping of the database.
*Is there a way to block writings to the DB so that there's nothing
written between the dump and the drop (I would lose them otherwise).*
I've looked everywhere, but as usual no fitting answer...
Thank you in advance
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// Oleg V.Toropov, MCP | ***@gmail.com
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t***@sanoia.com
2018-11-27 16:22:18 UTC
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That would be a nice idea, but the problem is that everything is done with
the admin user, so I can't revoke my own right, can I?

I'm thinking about blocking access with the firewall, I don't know if it's
a good idea, and I'm not even sure it's doable (inter-container
connectivity...)
Post by Oleg Toropov
How about to temporally revoke users rights to write?
Post by t***@sanoia.com
Hello!
1) Dump it to a backup file
2) Drop it
3) Everyday, dump the new entries to backup files
So it's basically incremental backup, but I've got the basic
installation, so no ReplicaSet, no nothing
To prevent writings between 1) and 2), I put a fsyncLock on the database,
But I realized that it prevents the dropping of the database.
*Is there a way to block writings to the DB so that there's nothing
written between the dump and the drop (I would lose them otherwise).*
I've looked everywhere, but as usual no fitting answer...
Thank you in advance
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//
// -----------------------------------------------------------------
// I have discovered that if I read enough stuff that's over my head,
// I actually begin to understand some of it.
//
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Oleg Toropov
2018-11-28 03:00:49 UTC
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OK, create user "superadmin" with root privileges. Logon as "superadmin",
revoke writing privileges from "admin",
then do 1) and 2) as "superadmin"user.
Post by t***@sanoia.com
That would be a nice idea, but the problem is that everything is done with
the admin user, so I can't revoke my own right, can I?
I'm thinking about blocking access with the firewall, I don't know if it's
a good idea, and I'm not even sure it's doable (inter-container
connectivity...)
Post by Oleg Toropov
How about to temporally revoke users rights to write?
Post by t***@sanoia.com
Hello!
1) Dump it to a backup file
2) Drop it
3) Everyday, dump the new entries to backup files
So it's basically incremental backup, but I've got the basic
installation, so no ReplicaSet, no nothing
To prevent writings between 1) and 2), I put a fsyncLock on the database,
But I realized that it prevents the dropping of the database.
*Is there a way to block writings to the DB so that there's nothing
written between the dump and the drop (I would lose them otherwise).*
I've looked everywhere, but as usual no fitting answer...
Thank you in advance
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//
// -----------------------------------------------------------------
// I have discovered that if I read enough stuff that's over my head,
// I actually begin to understand some of it.
//
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//
// Oleg V.Toropov, MCP | ***@gmail.com
// -----------------------------------------------------------------
// I have discovered that if I read enough stuff that's over my head,
// I actually begin to understand some of it.
//
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'Kevin Adistambha' via mongodb-user
2018-11-28 05:32:06 UTC
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Hi,

Is there a way to block writings to the DB so that there’s nothing written
between the dump and the drop (I would lose them otherwise).

It seems to me that what you’re trying to solve is a race condition between
taking a backup and dropping the collection, while a writer is constantly
writing to the database. Is this accurate?

Can I propose an alternative solution instead? How about writing to a
timestamped collection? Instead of writing to the same collection name
every day, append today’s date to the collection name. For example:

dt = '2018-11-28'
db['collection-' + dt].insert(...)

With this scheme, you can backup and drop yesterday’s collection at your
leisure, while today’s collection can be written to at the same time
without the need to fsynclock the server. As a bonus, you have the day’s
log separated and discernible by their collection name. Will this scheme
serve your need?

Best regards,
Kevin
​
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