Hi,
I am attempting to write graphs to disk using an SWP. Unfortunately, while
I cannot reproduce it on demand, the actual writing of the triples to a
file is only successful about 50% of the time. When it is not successful,
TBC chews up my CPUs and consumes memory until it ultimately hits the heap
limit. The closest thing to a stack trace I've been able to get is the
error pasted below. I was able to recover this from a log last week and it
occured around the same time as the problem. When this problem occurs, I
have to kill TBC as it never stops nor is it interruptible.
The SWP that does the writing is below. It calls a number of other SWPs
and then attempts to do three things:
1. Dump ui:tempGraphWorking using ui:dumpGraph
2. Attempt to write ui:tempGraphTags to a file. It sometimes hangs here.
3. Attempt to clear ui:tempGraphWorking
4. Attempt to write ui:tempGraphWorking to a file. It hangs here most
often.
Each ui:update is wrapped in a transaction.
I'm at a loss as to why this is happening. Not being able to consistently
execute these SWPs is putting my project in jeopardy.
Any help is greatly appreciated!
Tim
<ui:group let:inputFileGraph="{= IRI(?inputFile) }" let:outputFileGraph="{=
IRI(?outputGraph) }">
<!-- Load the input file into a graph -->
<h3>The input file is {= ?inputFile } Graph: {= ?inputFileGraph }</h3>
<h3>The output graph is {= ?outputGraph } Graph: {= ?outputFileGraph
}</h3>{= smf:trace("Loading the input graph...") }<ui:setContext
ui:queryGraph="{= ui:graphWithImports(?inputFileGraph) }">-->
<l5x:ProcessController_Programs/>
<l5x:ProcessAOIs/>
<l5x:ProcessBlocks/>
<l5x:ProcessICons/>
<l5x:ProcessIRefs/>
<l5x:ProcessOCons/>
<l5x:ProcessORefs/>
<l5x:ProcessWires/>
<l5x:ProcessTags/>
</ui:setContext>
<ui:dumpGraph ui:filePath="/
data.example.com/Temp/DATA_Line_Connections-temp_output.ttl"
ui:graph="ui:tempGraphWorking"/>
<!-- Try to insert into the output graph -->OUTPUT Graph: {=
?outputFileGraph }<ui:setContext ui:queryGraph="<
http://data.example.com/Instances/Global_Tags>";>} }"/>
{= smf:trace("Writing tag graph... ") }<ui:transaction>
<ui:update ui:updateQuery="{!
INSERT {
?s ?p ?o .
}
WHERE {
GRAPH ui:tempGraphTags {
?s ?p ?o .
} .
} }"/>
</ui:transaction>
</ui:setContext>
<ui:setContext ui:queryGraph="<
http://data.example.com/instances/Line_Connections>";>} }"/>
{= smf:trace("Clearing output graph... ") }<ui:transaction>
<ui:update ui:updateQuery="{!
DELETE {
?s ?p ?o .
}
WHERE {
BIND (IRI(<
http://data.example.com/instances/Line_Connections>) AS ?graph) .
GRAPH ?graph {
?s ?p ?o .
NOT EXISTS {
?graph ?p ?o .
} .
} .
} }"/>
</ui:transaction>
<ui:transaction>{= smf:trace("Writing output graph... ")
}<ui:update ui:updateQuery="{!
INSERT {
?s ?p ?o .
}
WHERE {
GRAPH ui:tempGraphWorking {
?s ?p ?o .
} .
} }"/>
</ui:transaction>
</ui:setContext>
<h2> Finished!!! </h2>{= smf:trace("Finished!") }</ui:group>
!ENTRY org.apache.jena.sparql.engine.iterator.QueryIterFilterExpr 2 0
2020-08-21 15:49:47.958
!MESSAGE General exception in (= (<http://spinrdf.org/spr#rowCount> ?arg1)
0)
!STACK 0
java.lang.NullPointerException
at java.util.concurrent.ConcurrentHashMap.get(ConcurrentHashMap.java:936)
at
org.topbraid.spin.swp.internal.sprn.SPRNTables.getTable(SPRNTables.java:92)
at
org.topbraid.spin.swp.internal.sprn.RowCountFunction.exec(RowCountFunction.java:19)
at
org.topbraid.jenax.functions.AbstractFunction1.exec(AbstractFunction1.java:35)
at
org.topbraid.jenax.functions.AbstractFunction.exec(AbstractFunction.java:110)
at org.apache.jena.sparql.expr.E_Function.evalSpecial(E_Function.java:89)
at org.apache.jena.sparql.expr.ExprFunctionN.eval(ExprFunctionN.java:100)
at org.apache.jena.sparql.expr.ExprNode.eval(ExprNode.java:93)
at org.apache.jena.sparql.expr.ExprFunction2.eval(ExprFunction2.java:76)
at org.apache.jena.sparql.expr.ExprNode.isSatisfied(ExprNode.java:41)
at
org.apache.jena.sparql.engine.iterator.QueryIterFilterExpr.accept(QueryIterFilterExpr.java:49)
at
org.apache.jena.sparql.engine.iterator.QueryIterProcessBinding.hasNextBinding(QueryIterProcessBinding.java:69)
at
org.apache.jena.sparql.engine.iterator.QueryIteratorBase.hasNext(QueryIteratorBase.java:114)
at
org.apache.jena.sparql.engine.iterator.QueryIteratorWrapper.hasNextBinding(QueryIteratorWrapper.java:38)
at
org.apache.jena.sparql.engine.iterator.QueryIteratorBase.hasNext(QueryIteratorBase.java:114)
at
org.apache.jena.sparql.engine.iterator.QueryIteratorWrapper.hasNextBinding(QueryIteratorWrapper.java:38)
at
org.apache.jena.sparql.engine.iterator.QueryIteratorBase.nextBinding(QueryIteratorBase.java:153)
at
org.apache.jena.sparql.engine.iterator.QueryIteratorBase.next(QueryIteratorBase.java:131)
at
org.apache.jena.sparql.engine.iterator.QueryIteratorBase.next(QueryIteratorBase.java:40)
at
org.apache.jena.sparql.engine.QueryExecutionBase.execAsk(QueryExecutionBase.java:365)
at
org.topbraid.sparql.LockOptimizedQueryExecution.execAsk(LockOptimizedQueryExecution.java:200)
at
org.topbraid.spin.arq.SPINARQFunction.executeBody(SPINARQFunction.java:281)
at org.topbraid.spin.arq.SPINARQFunction.exec(SPINARQFunction.java:258)
at org.apache.jena.sparql.expr.E_Function.evalSpecial(E_Function.java:89)
at org.apache.jena.sparql.expr.ExprFunctionN.eval(ExprFunctionN.java:100)
at org.apache.jena.sparql.expr.ExprNode.eval(ExprNode.java:93)
at org.apache.jena.sparql.expr.ExprFunction1.eval(ExprFunction1.java:68)
at
org.topbraid.spin.swp.engine.expressionhandlers.DefaultExpressionHandler.evaluate(DefaultExpressionHandler.java:67)
at
org.topbraid.spin.swp.engine.SWPEngine.evaluateArguments(SWPEngine.java:1013)
at
org.topbraid.spin.swp.engine.SWPEngine.evaluateArguments(SWPEngine.java:956)
at org.topbraid.spin.swp.engine.SWPEngine.createNodes(SWPEngine.java:703)
at org.topbraid.spin.swp.engine.SWPEngine.createNodes(SWPEngine.java:688)
at org.topbraid.spin.swp.engine.SWPEngine.addChildNodes(SWPEngine.java:417)
at org.topbraid.spin.swp.engine.SWPEngine.addChildNodes(SWPEngine.java:395)
at
org.topbraid.spin.swp.engine.control.internal.GroupControlElement.run(GroupControlElement.java:20)
at org.topbraid.spin.swp.engine.SWPEngine.createNodes(SWPEngine.java:731)
at
org.topbraid.spin.swp.engine.SWPEngine.createNodesFromPrototype(SWPEngine.java:821)
at org.topbraid.spin.swp.engine.SWPEngine.createNodes(SWPEngine.java:724)
at org.topbraid.spin.swp.engine.SWPEngine.createNodes(SWPEngine.java:688)
at org.topbraid.spin.swp.engine.SWPEngine.run(SWPEngine.java:1473)
at org.topbraid.spin.swp.engine.XMLEngine.run(XMLEngine.java:106)
at org.topbraid.spin.swp.engine.XMLEngine.runService(XMLEngine.java:202)
at
org.topbraid.team.system.AutoTransitionsManager.checkAutoTransitions(AutoTransitionsManager.java:50)
at
org.topbraid.team.system.AutoTransitionsManager.access$0(AutoTransitionsManager.java:46)
at
org.topbraid.team.system.AutoTransitionsManager$1.run(AutoTransitionsManager.java:36)
at java.lang.Thread.run(Thread.java:748)
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