sparql by curl, python: no results

[S Vista]

Hi everyone,

I'm new to blazegraph and sparql, sorry if the question is trivial.
I have installed Blazegraph (followed instructions here ) on a Google Cloud (GC) instance. The installation went through without any problems (I'm using the default configuration, nothing is changed on my side). I also have ran runBlazegraph.sh successfully followed by an equally successful running of the munge.sh and loadRestAPI.sh scripts. All went through without errors (the loading is still underway though I'm not expecting any errors). I'm loading wikidata's latest dump to my Blazegraph instance. While loading is running, I would like to do a sanity check by running a simple query to see if there's any data in the database.

What I did first was to go to the GUI using this link: http://localhost:9999/bigdata/#query and run a simple query like:

select * where { ?s ?p ?o } LIMIT 100

However, the query returns an empty result. Note that I had to tunnel to the GC machine in order to view the GUI.

Thinking that perhaps I'm using the wrong URI, or maybe tunnelling to the GC machine is messing things up, I tried to run things on the GC machine itself. I also changed the URI so as to use the proper namespace (wdq in my case). I executed a Curl command like:

curl -G http://localhost:9999/bigdata/namespace/wdq/sparql --data-urlencode 'query=SELECT * { ?s ?p ?o } LIMIT 100' -H 'Accept:application/sparql-results+json'

which got me another empty result set. Also, found a similar question on this forum suggesting a change of bigdata to blazegraph in the Curl command above. I tried that and got another empty result. Using the wget also returned empty.

Using the Python pymantic library as below wouldn't help either:

from pymantic import sparql
server = sparql.SPARQLServer('http://127.0.0.1:9999/bigdata/namespace/wdq/sparql')
result = server.query("select * where { ?s ?p ?o } limit 100")

I think I'm doing something wrong here. I don't get any errors, but I'm not getting any results either. My questions is:

1. Maybe this is happening because the load process hasn't finished loading yet?
2. Or perhaps it is because I'm using the wrong URI (http://localhost:9999/bigdata/#query or http://127.0.0.1:9999/bigdata/namespace/wdq/sparql). If this is the case, what would be the right one?
3. Being a new-be in Blazegraph and Wikidata, maybe I've got it all wrong, in which case I would appreciate a link to a complete step-by-step setup guide.

[Bryan Thompson]

I am not sure how the data is being loaded. If it is running as a single
transaction then you will not see any data until that transaction commits.,
transactional isolation.

On Mon, Apr 8, 2019 at 16:06 S Vista vistas@users.sourceforge.net wrote:

Hi everyone,

I'm new to blazegraph and sparql, sorry if the question is trivial.
I have installed Blazegraph (followed instructions here
https://www.mediawiki.org/wiki/Wikidata_Query_Service/User_Manual#Standalone_service
) on a Google Cloud (GC) instance. The installation went through without
any problems (I'm using the default configuration, nothing is changed on my
side). I also have ran runBlazegraph.sh successfully followed by an
equally successful running of the munge.sh and loadRestAPI.sh scripts.
All went through without errors (the loading is still underway though I'm
not expecting any errors). I'm loading wikidata's latest dump
https://dumps.wikimedia.org/wikidatawiki/entities/ to my Blazegraph
instance. While loading is running, I would like to do a sanity check
by running a simple query to see if there's any data in the database.

What I did first was to go to the GUI using this link:
http://localhost:9999/bigdata/#query and run a simple query like:

select * where { ?s ?p ?o } LIMIT 100

However, the query returns an empty result. Note that I had to tunnel to
the GC machine in order to view the GUI.

Thinking that perhaps I'm using the wrong URI, or maybe tunnelling to the
GC machine is messing things up, I tried to run things on the GC machine
itself. I also changed the URI so as to use the proper namespace (wdq
in my case). I executed a Curl command like:

curl -G http://localhost:9999/bigdata/namespace/wdq/sparql --data-urlencode 'query=SELECT * { ?s ?p ?o } LIMIT 100' -H 'Accept:application/sparql-results+json'

which got me another empty result set. Also, found a similar question on
this forum
https://sourceforge.net/p/bigdata/discussion/676946/thread/bc9b1791/
suggesting a change of bigdata to blazegraph in the Curl command above. I
tried that and got another empty result. Using the wget also returned
empty.

Using the Python pymantic library as below wouldn't help either:

from pymantic import sparqlserver = sparql.SPARQLServer('http://127.0.0.1:9999/bigdata/namespace/wdq/sparql')result = server.query("select * where { ?s ?p ?o } limit 100")

I think I'm doing something wrong here. I don't get any errors, but I'm
not getting any results either. My questions is:

1. Maybe this is happening because the load process hasn't finished
   loading yet?
2. Or perhaps it is because I'm using the wrong URI (
   http://localhost:9999/bigdata/#query or
   http://127.0.0.1:9999/bigdata/namespace/wdq/sparql). If this is the
   case, what would be the right one?
3. Being a new-be in Blazegraph and Wikidata, maybe I've got it all
   wrong, in which case I would appreciate a link to a complete step-by-step
   setup guide.

---

sparql by curl, python: no results
https://sourceforge.net/p/bigdata/discussion/676946/thread/54838d50fa/?limit=25#a211

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