Sleepycat examples need help

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Nicholas Car

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May 7, 2021, 9:51:43 PM5/7/21
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Hi everyone,

I'm working on a large documentation update (https://github.com/RDFLib/rdflib/pull/1296) to get RDFlib ready for a major update to 6.0.0.

I'm fixing broken examples, updating code styles and so on.

I'm stuck with the SleepyCat store and examples:
I can't get any sensible results from running the example, my output:

> Triples in graph before add: 0
> Triples in graph after add: 0
> Triples still in graph: 0

SleepyCat has been changed in Python 3 (see old package https://pypi.org/project/bsddb3/ with note to use https://pypi.org/project/berkeleydb/ instead).

Does anyone on this list know anything about SleepyCat/BerkeleyDb and could they help update this example to run in RDFlib master?

Thanks,

Nick

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Nicholas Car

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May 7, 2021, 11:20:47 PM5/7/21
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If anyone does want to take a look, I've branched the renaming of Sleepycat to BerkeleyDB and the code updates to https://github.com/RDFLib/rdflib/tree/BerkeleyDB

Nick

Graham Higgins

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May 8, 2021, 5:51:21 AM5/8/21
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Can't reproduce the issue here after a straight copy'n'pasta:

Triples in graph before add: 0
Triples in graph after add: 2
b'@prefix test: <http://rdflib.net/test/> .
test:pic:1 test:name "Jane & Bob" .
test:pic:2 test:name "Squirrel in Tree" .'
Triples still in graph: 2

Cheers,

Graham

Nicholas Car

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May 8, 2021, 8:10:58 AM5/8/21
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Hi Graham,

Was that running the original sleepycat_example.py against RDFlib master? What version of Python did you run on?

I’m running against master on Python 3.9 and since the sleepycat library won’t be supported in Python 3.10 (according to the BerkeleyFB replacement module) I switched to that and got a run failure. The BerkeleyDB module claims to be comparable with sleepycat.

In my BerkeleyDB branch, see this line:


That’s using BerkeleyDB in a renamed store file (Sleepycat to BerkeleyDB) with very few other changes (“” goes to None, not many other).

Nick

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Dr Nicholas Car
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On 8 May 2021, at 7:51 pm, Graham Higgins <gjhi...@gmail.com> wrote:


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Graham Higgins

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May 8, 2021, 10:04:06 AM5/8/21
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> Was that running the original sleepycat_example.py against RDFlib master? What version of Python did you run on?
Originally, system Python (3.8.5) on RDFLib 5.0 release, rechecked with Python 3.5.8 on RDFLib master, still works okay.

So, still using RDFLib master, I pip-installed berkeleydb and tried a simple  change:

- import bsddb3
+ from berkeleydb import db as bsddb3

Still works.

> Triples in graph before add:  0
> Triples in graph after add:  2
> @prefix test: <http://rdflib.net/test/> .
>
> <http://rdflib.net/test/pic:1> test:name "Jane & Bob" .
>
> <http://rdflib.net/test/pic:2> test:name "Squirrel in Tree" .

>
>
> Triples still in graph:  2

Cheers,

Graham

Graham Higgins

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May 8, 2021, 10:06:17 AM5/8/21
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> Originally, system Python (3.8.5) on RDFLib 5.0 release, rechecked with Python 3.5.8 on RDFLib master, still works okay.
Meh, I meant Python 3.8.5, not 3.5.8.

Graham Higgins

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May 8, 2021, 10:13:00 AM5/8/21
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So, still using RDFLib master, I pip-installed berkeleydb and tried a simple  change:

- import bsddb3
+ from berkeleydb import db as bsddb3

On reflection , I doubt that changes anything significant.

Nicholas Car

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May 8, 2021, 6:36:17 PM5/8/21
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Thanks again, that’s all good news since I’m really just interested in ensuring that all existing stores and examples keep working in the face of code base tidy-ups and not so concerned with updating the stores that much.

I’ll try and replicate everything working the same in the next day or two and, if it does, just move on to other 6.0.0 readiness things (more documentation updates in https://github.com/RDFLib/rdflib/pull/1296).

Cheers, Nick

On 9 May 2021, at 12:13 am, Graham Higgins <gjhi...@gmail.com> wrote:


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Graham Higgins

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May 9, 2021, 5:20:12 AM5/9/21
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>> Thanks again, that’s all good news since I’m really just interested in ensuring that all existing stores and examples keep working in the face of code base tidy-ups and not so concerned with updating the stores that much.

Sorry to be the bearer of bad news but as I suspected, my lazy test didn't actually test anything significant. I tried a fresh venv with berkeleydb/RDFLib-BerkeleyDB and got the same results as you.

Cheers

Graham

Nicholas Car

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May 10, 2021, 8:16:59 AM5/10/21
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Blast! Ok, back to the open call to all for help!

I’ll try and chip away at understanding BerkeleyDB but the modern package isn’t so well documented (“just see the C documentation” in lots of places).

Am considering a Redis store. Has anyone implemented such a thing?

Nick

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Dr Nicholas Car
Data Systems Architect
SURROUND Australia
0477 560 177

On 9 May 2021, at 7:20 pm, Graham Higgins <gjhi...@gmail.com> wrote:


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