Re: [Rpm-maint] [rpm-software-management/rpm] RFE: Offer LMDB as an alternative engine to BDB for rpmdb (#128)

[Panu Matilainen]

On 01/16/2017 02:51 AM, Neal Gompa wrote:

On Sun, Jan 15, 2017 at 11:43 AM, Ralf Corsepius  wrote:

On 01/15/2017 04:03 PM, Neal Gompa (ニール・ゴンパ) wrote:


I'm not sure how true it is, but it seems to bear out with the number of
previously BDB users now being LMDB users.



Unless a different DB offers substantial advantages over BDB to RPM, which
does not endanger or destabilize rpm, I do not see any reason to switch
different DB.



BDB 5 is unmaintained. There's no one upstream working on it, since
Oracle has moved onto BDB 6. No one wants to use BDB 6. RPM should not
depend on dead software. And there are significant performance
advantages to LMDB, according to various benchmarks[1].And LMDB looks
like it could enable making the RPMDB to be more resilient[2].

[1]: 
https://symas.com/products/lightning-memory-mapped-database/project-benchmarks/
[2]: 
https://symas.com/products/lightning-memory-mapped-database/feature-comparison/



Lies, statistics, benchmarks, vendor benchmarks... ditto with feature 
comparisons.


BDB5 being unmaintained is a real concern though.

- Panu -

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Re: [Rpm-maint] [rpm-software-management/rpm] RFE: Offer LMDB as an alternative engine to BDB for rpmdb (#128)

[Neal Gompa]

On Sun, Jan 15, 2017 at 11:43 AM, Ralf Corsepius  wrote:
> On 01/15/2017 04:03 PM, Neal Gompa (ニール・ゴンパ) wrote:
>
>> I'm not sure how true it is, but it seems to bear out with the number of
>> previously BDB users now being LMDB users.
>
>
> Unless a different DB offers substantial advantages over BDB to RPM, which
> does not endanger or destabilize rpm, I do not see any reason to switch
> different DB.
>

BDB 5 is unmaintained. There's no one upstream working on it, since
Oracle has moved onto BDB 6. No one wants to use BDB 6. RPM should not
depend on dead software. And there are significant performance
advantages to LMDB, according to various benchmarks[1]. And LMDB looks
like it could enable making the RPMDB to be more resilient[2].

[1]: 
https://symas.com/products/lightning-memory-mapped-database/project-benchmarks/
[2]: 
https://symas.com/products/lightning-memory-mapped-database/feature-comparison/

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Re: [Rpm-maint] [rpm-software-management/rpm] RFE: Offer LMDB as an alternative engine to BDB for rpmdb (#128)

[Ørjan Malde]

LMDB as an alternative to BDB would further help with targetting less-known and 
new platforms. and as far as I know, make RPM buildable and usable on midipix 
for example.

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Re: [Rpm-maint] [rpm-software-management/rpm] RFE: Offer LMDB as an alternative engine to BDB for rpmdb (#128)

[Robert Scheck]

At https://bugzilla.redhat.com/show_bug.cgi?id=1086784, there also was kind of 
discussion about that.

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Re: [Rpm-maint] [rpm-software-management/rpm] RFE: Offer LMDB as an alternative engine to BDB for rpmdb (#128)

[Ralf Corsepius]

On 01/15/2017 04:03 PM, Neal Gompa (ニール・ゴンパ) wrote:


I'm not sure how true it is, but it seems to bear out with the number of
previously BDB users now being LMDB users.


Unless a different DB offers substantial advantages over BDB to RPM, 
which does not endanger or destabilize rpm, I do not see any reason to 
switch different DB.


Ralf

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[Rpm-maint] [rpm-software-management/rpm] RFE: Offer LMDB as an alternative engine to BDB for rpmdb (#128)

[ニール・ゴンパ]

I think most of us are keenly aware that Berkeley DB 5.x is dead. While Oracle 
has Berkeley DB 6.x, it is licensed AGPLv3, which seems to make some people 
rather skittish.

As a potential alternative, why not use 
[LMDB](https://symas.com/products/lightning-memory-mapped-database/)? Projects 
like OpenLDAP, CFEngine, Postfix, etc. have moved to LMDB or use it by default 
from BDB after BDB 6 arrived.

LMDB is available in Fedora, Mageia, and openSUSE already, so the dependency 
would already be available for us to use. It should also be easy to support 
having internal LMDB like OpenSUSE does now for BDB (the [LMDB 
sources](https://github.com/LMDB/lmdb) look like they're built in a rather 
simple manner, so embedding it shouldn't be terrible).

According to [the LMDB web page on projects using 
LMDB](https://symas.com/products/lightning-memory-mapped-database/involvement-in-other-projects/):

> Note, because it’s so easy to modify BerkeleyDB-based projects to use LMDB 
> instead, the list of BerkeleyDB-based adaptations is growing quickly.

I'm not sure how true it is, but it seems to bear out with the number of 
previously BDB users now being LMDB users.

LMDB is licensed under the OpenLDAP license, which is a BSD-style license, so 
people who freaked out over BDB 6 shouldn't be freaking out over LMDB.

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