urlopen error [Errno 99] Address not available

[ahmad88me]

I am running the code inside docker. For some queries I got this error urlopen error [Errno 99] Address not available. But when I retry the same query again, it seems to work.

The query (on DBpedia)

select distinct ?c where{
        <http://www.wikidata.org/entity/Q51884> a ?c
        }

The python code (attached)

from SPARQLWrapper import SPARQLWrapper, JSON

def run_query_once(query, endpoint):
    """
    :param query: raw SPARQL query
    :param endpoint: endpoint source that hosts the data
    :return: query result as a dict
    """
    sparql = SPARQLWrapper(endpoint=endpoint)
    sparql.setQuery(query=query)
    sparql.setMethod("POST")
    sparql.setReturnFormat(JSON)
    try:
        results = sparql.query().convert()
        if len(results["results"]["bindings"]) > 0:
            return results["results"]["bindings"]
        else:
            logger.debug("returns 0 rows")
            logger.debug("query: <%s>" % str(query).strip())
            return []
    except Exception as e:
        logger.warning(str(e))
        logger.warning("sparql error: $$<%s>$$" % str(e))
        logger.warning("query: $$<%s>$$" % str(query))
        return None

query = """
select distinct ?c where{
        <http://www.wikidata.org/entity/Q51884> a ?c
        }
"""
endpoint = "http://dbpedia.org/sparql"
r = run_query_once(query, endpoint)
print(r)

[dayures]

Maybe it could be an issue in dbpedia availability. Did you try to check the endpoint availability in advance?

[ahmad88me]

When I added randomised wait for the queries that failed it worked.

[dayures]

Thanks for contributing to this issue. As it has been more than 90 days since the last activity, we are automatically closing the issue. This is often because the request was already solved in some way and it just wasn't updated or it's no longer applicable. If that's not the case, please do feel free to either reopen this issue or open a new one. We'll gladly take a look again!