Hi - your messages loose the indication of who wrote what.
Maybe it's this part of the query that causes some or all of the costs
> graph ?g1 {
>> ?thing a ?CLASS .
>>
>
> Unnecessary?
>
?g1 and ?CLASS aren't used so this is only some kind of existence test.
It is a partial cross product on the first part. With the DISTINCT in
the SELECT there may a very large number of results yet only a few DISTINCT.
Andy
On 04/12/17 08:55, Jean-Marc Vanel wrote:
Le 1 déc. 2017 8:08 PM, "Andy Seaborne" <a...@apache.org> a écrit :
On 01/12/17 11:49, Jean-Marc Vanel wrote:
Hi
The time for a SPARQL + Lucene query is more than 1 mn.
It used to be around one second, and then the database grew.
Here is a typical query run for a lookup service similar to dbpedia lookup:
PREFIX text: <http://jena.apache.org/text#>
PREFIX form: <
http://raw.githubusercontent.com/jmvanel/semantic_forms/mast
er/vocabulary/forms.owl.ttl#
SELECT DISTINCT ?thing ?COUNT WHERE {
graph ?g {
?thing text:query ( 'Jean-Marc' ) .
}
This is going to loop on each graph and make a text:query for each one.
Is that what you intended?
Remove the "graph ?g {".
(and then remove the DISTINCT)
When I do this, the result is empty.
The way the text index is initialized must be wrong:
https://github.com/jmvanel/semantic_forms/blob/master/scala/forms/src/main/scala/deductions/runtime/jena/lucene/LuceneIndex.scala
On fact, the graph where where a literal triple belongs is not relevant un
this application.
graph ?g1 {
?thing a ?CLASS .
Unnecessary?
}
OPTIONAL {
graph ?grCount {
?thing form:linksCount ?COUNT.
} }
} ORDER BY DESC(?COUNT)
LIMIT 10
Here is a simpler query that is also slow:
PREFIX text: <http://jena.apache.org/text#>
SELECT DISTINCT ?thing ?COUNT WHERE {
graph ?g {
?thing text:query ( 'Jean-Marc' ) .
}
} ORDER BY DESC(?COUNT)
LIMIT 10
Run it with:
time wget -O semantic-forms.cc_select-ui.txt
http://semantic-forms.cc:9112/select-ui?query=PREFIX+text%3A
+%3Chttp%3A%2F%2Fjena.apache.org%2Ftext%23%3E+%0D%0ASELECT+
DISTINCT+%3Fthing+%3FCOUNT+WHERE+%7B%0D%0A++graph+%3Fg+%
7B%0D%0A++++%3Fthing+text%3Aquery+%28+%27Jean-Marc%27+%
29+.%0D%0A++%7D%0D%0A%7D%0D%0AORDER+BY+DESC%28%3FCOUNT%29%0D%0ALIMIT+10
Or, if you want to use YasGUI , the endpoint is
http://semantic-forms.cc:9112/sparql
*Statistics on the database*
268 graphs and 588 864 triples.
# Count graphs and triples
SELECT (COUNT(?s) AS ?trc) (COUNT(?GR) AS ?grc)
WHERE {
{ GRAPH ?GR { } }
UNION
{ GRAPH ?GR1 { ?s ?p ?o . } }
}
Result: 2 rows
"grc" "trc"
"268"^^http://www.w3.org/2001/XMLSchema#integer "588864"^^
http://www.w3.org/2001/XMLSchema#integer
(I'm not sure this the right way to count, but it gives figures :) )
You can reproduce the query with this UI :
http://semantic-forms.cc:9112/select-ui?query=%23+Count+grap
hs%0D%0ASELECT+%28COUNT%28%3Fs%29+AS+%3Ftrc%29+%28COUNT%
28%3FGR%29+AS+%3Fgrc%29%0D%0A++++WHERE+%7B%0D%0A+++++%7B+
GRAPH+%3FGR+%7B+%7D+%7D%0D%0A++UNION%0D%0A++++%7B+GRAPH+%
3FGR1+%7B+%3Fs+%3Fp+%3Fo+.+%7D+%7D%0D%0A%7D
This is using Jena 3.5.0. with TDB 1 .
Here is a stack made with kill -3 when the app. was working hard;
I put in bold a suspect line.
"application-akka.actor.default-dispatcher-1351" #2683 prio=5 os_prio=0
tid=0x00007f07a801c000 nid=0x9b7 runnable [0x00007f06f25ab000]
java.lang.Thread.State: RUNNABLE
at sun.nio.ch.NativeThread.current(Native Method)
at sun.nio.ch.NativeThreadSet.add(NativeThreadSet.java:46)
at sun.nio.ch.FileChannelImpl.readInternal(FileChannelImpl.java:737)
at sun.nio.ch.FileChannelImpl.read(FileChannelImpl.java:727)
at
org.apache.lucene.store.NIOFSDirectory$NIOFSIndexInput.
readInternal(NIOFSDirectory.java:179)
at
org.apache.lucene.store.BufferedIndexInput.refill(BufferedIn
dexInput.java:342)
at
org.apache.lucene.store.BufferedIndexInput.readByte(Buffered
IndexInput.java:54)
at org.apache.lucene.store.DataInput.readInt(DataInput.java:101)
at
org.apache.lucene.store.BufferedIndexInput.readInt(BufferedI
ndexInput.java:183)
at org.apache.lucene.codecs.CodecUtil.checkHeader(CodecUtil.java:194)
at org.apache.lucene.util.fst.FST.<init>(FST.java:327)
at org.apache.lucene.util.fst.FST.<init>(FST.java:313)
at
org.apache.lucene.codecs.blocktree.FieldReader.<init>(FieldReader.java:91)
at
org.apache.lucene.codecs.blocktree.BlockTreeTermsReader.<
init>(BlockTreeTermsReader.java:234)
at
org.apache.lucene.codecs.lucene50.Lucene50PostingsFormat.fie
ldsProducer(Lucene50PostingsFormat.java:445)
at
org.apache.lucene.codecs.perfield.PerFieldPostingsFormat$Fie
ldsReader.<init>(PerFieldPostingsFormat.java:292)
at
org.apache.lucene.codecs.perfield.PerFieldPostingsFormat.fie
ldsProducer(PerFieldPostingsFormat.java:372)
at
org.apache.lucene.index.SegmentCoreReaders.<init>(SegmentCor
eReaders.java:112)
at org.apache.lucene.index.SegmentReader.<init>(SegmentReader.java:74)
at
org.apache.lucene.index.StandardDirectoryReader$1.doBody(Sta
ndardDirectoryReader.java:62)
at
org.apache.lucene.index.StandardDirectoryReader$1.doBody(Sta
ndardDirectoryReader.java:54)
at
org.apache.lucene.index.SegmentInfos$FindSegmentsFile.run(
SegmentInfos.java:692)
at
org.apache.lucene.index.StandardDirectoryReader.open(Standar
dDirectoryReader.java:77)
at org.apache.lucene.index.DirectoryReader.open(DirectoryReader.java:63)
at
org.apache.jena.query.text.TextIndexLucene.query(TextIndexLucene.java:370)
at org.apache.jena.query.text.TextQueryPF.performQuery(TextQuer
yPF.java:290)
at
org.apache.jena.query.text.TextQueryPF.lambda$query$1(TextQu
eryPF.java:267)
at
org.apache.jena.query.text.TextQueryPF$$Lambda$66/2108167189.call(Unknown
Source)
at
org.apache.jena.ext.com.google.common.cache.LocalCache$
LocalManualCache$1.load(LocalCache.java:5065)
at
org.apache.jena.ext.com.google.common.cache.LocalCache$Loadi
ngValueReference.loadFuture(LocalCache.java:3716)
at
org.apache.jena.ext.com.google.common.cache.LocalCache$
Segment.loadSync(LocalCache.java:2424)
at
org.apache.jena.ext.com.google.common.cache.LocalCache$
Segment.lockedGetOrLoad(LocalCache.java:2298)
* - locked <0x00000000ef9d34f8> (a
org.apache.jena.ext.com.google.common.cache.LocalCache$StrongAccessEntry)*
at
org.apache.jena.ext.com.google.common.cache.LocalCache$
Segment.get(LocalCache.java:2211)
at
org.apache.jena.ext.com.google.common.cache.LocalCache.get(
LocalCache.java:4154)
at
org.apache.jena.ext.com.google.common.cache.LocalCache$
LocalManualCache.get(LocalCache.java:5060)
at org.apache.jena.atlas.lib.cache.CacheGuava.getOrFill(CacheGu
ava.java:58)
at org.apache.jena.query.text.TextQueryPF.query(TextQueryPF.java:267)
at
org.apache.jena.query.text.TextQueryPF.variableSubject(TextQ
ueryPF.java:227)
at org.apache.jena.query.text.TextQueryPF.exec(TextQueryPF.java:196)
at
org.apache.jena.sparql.pfunction.PropertyFunctionBase$Repeat
ApplyIteratorPF.nextStage(PropertyFunctionBase.java:106)
at
org.apache.jena.sparql.engine.iterator.QueryIterRepeatApply.
makeNextStage(QueryIterRepeatApply.java:108)
at
org.apache.jena.sparql.engine.iterator.QueryIterRepeatApply.
hasNextBinding(QueryIterRepeatApply.java:65)
at
org.apache.jena.sparql.engine.iterator.QueryIteratorBase.has
Next(QueryIteratorBase.java:114)
at
org.apache.jena.sparql.engine.iterator.QueryIterProcedure.ha
sNextBinding(QueryIterProcedure.java:73)
at
org.apache.jena.sparql.engine.iterator.QueryIteratorBase.has
Next(QueryIteratorBase.java:114)
at
org.apache.jena.sparql.engine.iterator.QueryIterProcessBindi
ng.hasNextBinding(QueryIterProcessBinding.java:66)
at
org.apache.jena.sparql.engine.iterator.QueryIteratorBase.has
Next(QueryIteratorBase.java:114)
at
org.apache.jena.sparql.engine.main.iterator.QueryIterGraph$Q
ueryIterGraphInner.hasNextBinding(QueryIterGraph.java:121)
at
org.apache.jena.sparql.engine.iterator.QueryIteratorBase.has
Next(QueryIteratorBase.java:114)
at
org.apache.jena.sparql.engine.iterator.QueryIterRepeatApply.
hasNextBinding(QueryIterRepeatApply.java:74)
at
org.apache.jena.sparql.engine.iterator.QueryIteratorBase.has
Next(QueryIteratorBase.java:114)
at org.apache.jena.atlas.iterator.Iter$2.hasNext(Iter.java:265)
at
org.apache.jena.atlas.iterator.RepeatApplyIterator.hasNext(
RepeatApplyIterator.java:45)
at
org.apache.jena.tdb.solver.SolverLib$IterAbortable.hasNext(
SolverLib.java:195)
at org.apache.jena.atlas.iterator.Iter$2.hasNext(Iter.java:265)
at
org.apache.jena.sparql.engine.iterator.QueryIterPlainWrapper
.hasNextBinding(QueryIterPlainWrapper.java:53)
at
org.apache.jena.sparql.engine.iterator.QueryIteratorBase.has
Next(QueryIteratorBase.java:114)
at
org.apache.jena.sparql.engine.iterator.QueryIterRepeatApply.
makeNextStage(QueryIterRepeatApply.java:101)
at
org.apache.jena.sparql.engine.iterator.QueryIterRepeatApply.
hasNextBinding(QueryIterRepeatApply.java:65)
at
org.apache.jena.sparql.engine.iterator.QueryIteratorBase.has
Next(QueryIteratorBase.java:114)
at
org.apache.jena.sparql.engine.iterator.QueryIterConvert.hasN
extBinding(QueryIterConvert.java:58)
at
org.apache.jena.sparql.engine.iterator.QueryIteratorBase.has
Next(QueryIteratorBase.java:114)
at
org.apache.jena.sparql.engine.iterator.QueryIterTopN$1.initi
alizeIterator(QueryIterTopN.java:98)
at
org.apache.jena.atlas.iterator.IteratorDelayedInitialization
.init(IteratorDelayedInitialization.java:40)
at
org.apache.jena.atlas.iterator.IteratorDelayedInitialization
.hasNext(IteratorDelayedInitialization.java:50)
at
org.apache.jena.sparql.engine.iterator.QueryIterPlainWrapper
.hasNextBinding(QueryIterPlainWrapper.java:53)
at
org.apache.jena.sparql.engine.iterator.QueryIteratorBase.has
Next(QueryIteratorBase.java:114)
at
org.apache.jena.sparql.engine.iterator.QueryIteratorWrapper.
hasNextBinding(QueryIteratorWrapper.java:39)
at
org.apache.jena.sparql.engine.iterator.QueryIteratorBase.has
Next(QueryIteratorBase.java:114)
at
org.apache.jena.sparql.engine.iterator.QueryIteratorWrapper.
hasNextBinding(QueryIteratorWrapper.java:39)
at
org.apache.jena.sparql.engine.iterator.QueryIteratorBase.has
Next(QueryIteratorBase.java:114)
at
org.apache.jena.sparql.engine.iterator.QueryIteratorWrapper.
hasNextBinding(QueryIteratorWrapper.java:39)
at
org.apache.jena.sparql.engine.iterator.QueryIteratorBase.has
Next(QueryIteratorBase.java:114)
at
org.apache.jena.sparql.engine.ResultSetStream.hasNext(Result
SetStream.java:74)
at
org.apache.jena.sparql.engine.ResultSetCheckCondition.hasNex
t(ResultSetCheckCondition.java:55)
at
scala.collection.convert.Wrappers$JIteratorWrapper.hasNext(
Wrappers.scala:42)
at scala.collection.Iterator$class.toStream(Iterator.scala:1320)
at scala.collection.AbstractIterator.toStream(Iterator.scala:1334)
at
scala.collection.TraversableOnce$class.toIterable(
TraversableOnce.scala:296)
at scala.collection.AbstractIterator.toIterable(Iterator.scala:1334)
at
deductions.runtime.sparql_cache.SPARQLHelpers$$anonfun$sparq
lSelectQueryVariablesNT$1.apply(SPARQLHelpers.scala:382)
at
deductions.runtime.sparql_cache.SPARQLHelpers$$anonfun$sparq
lSelectQueryVariablesNT$1.apply(SPARQLHelpers.scala:370)
at deductions.runtime.utils.Timer$class.time(Timer.scala:18)
at controllers.Application$.time(Application.scala:8)
at
deductions.runtime.sparql_cache.SPARQLHelpers$class.sparqlSe
lectQueryVariablesNT(SPARQLHelpers.scala:370)
at
controllers.Application$.sparqlSelectQueryVariablesNT(Application.scala:8)
at
deductions.runtime.sparql_cache.SPARQLHelpers$$anonfun$8.
apply(SPARQLHelpers.scala:361)
at
deductions.runtime.sparql_cache.SPARQLHelpers$$anonfun$8.
apply(SPARQLHelpers.scala:361)
at
org.w3.banana.jena.JenaDatasetStore$$anonfun$r$1.apply(
JenaDatasetStore.scala:17)
at scala.util.Try$.apply(Try.scala:192)
at org.w3.banana.jena.JenaDatasetStore.r(JenaDatasetStore.scala:14)
at org.w3.banana.jena.JenaDatasetStore.r(JenaDatasetStore.scala:10)
at
deductions.runtime.sparql_cache.SPARQLHelpers$class.sparqlSe
lectQueryVariables(SPARQLHelpers.scala:359)
at controllers.Application$.sparqlSelectQueryVariables(Applicat
ion.scala:8)
at
deductions.runtime.services.Lookup$class.searchStringOrClass
(Lookup.scala:76)
at deductions.runtime.services.Lookup$class.lookup(Lookup.scala:44)
at controllers.Application$.lookup(Application.scala:8)
at controllers.Services$$anonfun$lookupService$1.apply(Services.scala:199)
at controllers.Services$$anonfun$lookupService$1.apply(Services.scala:193)
at play.api.mvc.ActionBuilder$$anonfun$apply$13.apply(Action.scala:371)
at play.api.mvc.ActionBuilder$$anonfun$apply$13.apply(Action.scala:370)
at play.api.mvc.Action$.invokeBlock(Action.scala:498)
at play.api.mvc.Action$.invokeBlock(Action.scala:495)
at play.api.mvc.ActionBuilder$$anon$2.apply(Action.scala:458)
at
play.api.mvc.Action$$anonfun$apply$2$$anonfun$apply$5$$anonf
un$apply$6.apply(Action.scala:112)
at
play.api.mvc.Action$$anonfun$apply$2$$anonfun$apply$5$$anonf
un$apply$6.apply(Action.scala:112)
at play.utils.Threads$.withContextClassLoader(Threads.scala:21)
at
play.api.mvc.Action$$anonfun$apply$2$$anonfun$apply$5.apply(
Action.scala:111)
at
play.api.mvc.Action$$anonfun$apply$2$$anonfun$apply$5.apply(
Action.scala:110)
at scala.Option.map(Option.scala:146)
at play.api.mvc.Action$$anonfun$apply$2.apply(Action.scala:110)
at play.api.mvc.Action$$anonfun$apply$2.apply(Action.scala:103)
at scala.concurrent.Future$$anonfun$flatMap$1.apply(Future.scala:253)
at scala.concurrent.Future$$anonfun$flatMap$1.apply(Future.scala:251)
at scala.concurrent.impl.CallbackRunnable.run(Promise.scala:36)
at
akka.dispatch.BatchingExecutor$AbstractBatch.processBatch(Ba
tchingExecutor.scala:55)
at
akka.dispatch.BatchingExecutor$BlockableBatch$$anonfun$run$1.apply$mcV$sp(
BatchingExecutor.scala:91)
at
akka.dispatch.BatchingExecutor$BlockableBatch$$anonfun$run$
1.apply(BatchingExecutor.scala:91)
at
akka.dispatch.BatchingExecutor$BlockableBatch$$anonfun$run$
1.apply(BatchingExecutor.scala:91)
at scala.concurrent.BlockContext$.withBlockContext(BlockContext.scala:72)
at
akka.dispatch.BatchingExecutor$BlockableBatch.run(BatchingEx
ecutor.scala:90)
at akka.dispatch.TaskInvocation.run(AbstractDispatcher.scala:39)
at
akka.dispatch.ForkJoinExecutorConfigurator$AkkaForkJoinTask.
exec(AbstractDispatcher.scala:415)
at scala.concurrent.forkjoin.ForkJoinTask.doExec(ForkJoinTask.java:260)
at
scala.concurrent.forkjoin.ForkJoinPool$WorkQueue.runTask(
ForkJoinPool.java:1339)
at scala.concurrent.forkjoin.ForkJoinPool.runWorker(ForkJoinPoo
l.java:1979)
at
scala.concurrent.forkjoin.ForkJoinWorkerThread.run(ForkJoinW
orkerThread.java:107)
