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View Code? Open in Web Editor NEWA simple example of how to integrate drools into an Apache Spark job
A simple example of how to integrate drools into an Apache Spark job
I am new to drools, can you please advise how to run drools on scala, unable to run you example.
I kept kmodule.xml in resources/META-INF
<?xml version="1.0" encoding="UTF-8"?>
<kmodule xmlns="http://jboss.org/kie/6.0.0/kmodule">
<kbase name="AuditKBase" default="true" packages="com.srinu.study.etl.framework.drools">
<ksession name="AuditKSession" type="stateless" default="true" />
</kbase>
</kmodule>
drl file in resource
package com.srinu.study.etl.framework.drools;
import com.srinu.study.etl.framework.Transaction
rule "Approve Good Credit"
when
a: Transaction(creditScore > 600)
then
a.setApproved(true);
end
Scala code
package com.srinu.study.etl.framework.drools
import com.srinu.study.etl.framework.logging.Logging
import com.typesafe.config.Config
import org.apache.spark.sql._
import org.kie.api.{KieBase, KieServices}
import org.kie.api.runtime.KieContainer
import org.kie.api.runtime.StatelessKieSession
import org.kie.internal.command.CommandFactory
case class Transaction(sno:Int,first_name:String,last_name:String,requestAmount:Int,creditScore:Int)
class DroolsRules(spark: SparkSession, config: Config, inputDate: String, drlFilePath: String) extends Logging
with Serializable {
private var approved = false
def applyDrools(): Unit = {
import spark.implicits._
val inputData = Seq((1, "John", "Doe", 10000, 568),
(2, "John", "Greg", 12000, 654),
(3, "Mary", "Sue", 100, 568),
(4, "Greg", "Darcy", 1000000, 788),
(5, "Jane", "Stuart", 10, 788))
val applicants = inputData.toDF("sno","first_name","last_name","requestAmount","creditScore").as[Transaction]
applicants.show()
val rules:KieBase= loadRules()
}
/*
public static KieBase loadRules() {
KieServices kieServices = KieServices.Factory.get();
KieContainer kieContainer = kieServices.getKieClasspathContainer();
return kieContainer.getKieBase();
}
*/
def loadRules(): KieBase = {
val kieServices:KieServices = KieServices.Factory.get()
val kieContainer:KieContainer = kieServices.getKieClasspathContainer()
kieContainer.getKieBase()
}
/*
public static Applicant applyRules(KieBase base, Applicant a) {
StatelessKieSession session = base.newStatelessKieSession();
session.execute(CommandFactory.newInsert(a));
return a;
}
*/
def setApproved(_approved: Boolean): Unit = {
approved = _approved
}
def applyRules( base:KieBase, trans:Transaction):Transaction={
val session:StatelessKieSession = base.newStatelessKieSession()
session.execute(CommandFactory.newInsert(trans))
trans
}
}
job failing @ val kieContainer:KieContainer = kieServices.getKieClasspathContainer()
When running on apache spark 1.6.1, I'm getting a java.util.ConcurrentModificationException
I'll try to provide detailed steps to reproduce, but I think the issue is while
Broadcast<KieBase> broadcastRules = sc.broadcast(rules);
"Caused by: java.util.ConcurrentModificationException",
"\tat java.util.Vector$Itr.checkForComodification(Vector.java:1184)",
"\tat java.util.Vector$Itr.next(Vector.java:1137)",
"\tat com.esotericsoftware.kryo.serializers.CollectionSerializer.write(CollectionSerializer.java:92)",
"\tat com.esotericsoftware.kryo.serializers.CollectionSerializer.write(CollectionSerializer.java:40)",
"\tat com.esotericsoftware.kryo.Kryo.writeObject(Kryo.java:552)",
"\tat com.esotericsoftware.kryo.serializers.ObjectField.write(ObjectField.java:80)",
"\t... 44 more",
Hello,
I am investigating a similar approach.
Can you share some of your finding or experience regarding the integration of Spark and Drools?
thank you
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