How to insert huge amount of nodes and relationships into neo4j through Spark Scala?

Neo4j Graph Platform
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1

How to insert huge amount of data (i.e, in millions) into the neo4j?
can anyone suggest me any approach?

Thanks.

2

Seen this:

3 

val relationshipConfig = Map(
      "EASY_ID" -> ("IMSI", "Easy_Id_not_null", "IMSI", "EasyID"),
      "AGE_GROUP" -> ("IMSI", "Age_Group", "IMSI", "AgeGroup"),
      "GENDER" -> ("IMSI", "gender_not_null", "IMSI", "Gender"),
      "DEVICE_OEM" -> ("IMSI", "Device_OEM", "IMSI", "DeviceOEM"),
      "DEVICE_MODEL" -> ("IMSI", "Device_Model", "IMSI", "DeviceModel")
)

def writeToNeo4j(
                    data: DataFrame,
                    relationship: String,
                    sourceColumn: String,
                    targetColumn: String,
                    sourceLabel: String,
                    targetLabel: String,
                    url: String,
                    username: String,
                    password: String
                  ) : Unit = {

data.select(sourceColumn, targetColumn).distinct().write
        .mode("Append")
        .format("org.neo4j.spark.DataSource")
        .option("relationship", relationship)
        .option("relationship.save.strategy", "keys")

        //USE THIS TO PREVENT DUPLICATE RELATIONSHIPS (OPTIONAL FOR NOW)
        .option("relationship.merge", "true")

        //SOURCE NODE DETAILS
        .option("relationship.source.save.mode", "Overwrite")
        .option("relationship.source.labels", s":$sourceLabel")
        .option("relationship.source.node.properties", s"$sourceColumn:$sourceLabel")
        .option("relationship.source.node.keys", s"$sourceColumn:$sourceLabel")

        //TARGET NODE DETAILS
        .option("relationship.target.save.mode", "Overwrite")
        .option("relationship.target.labels", s":$targetLabel")
        .option("relationship.target.node.properties", s"$targetColumn:$targetLabel")
        .option("relationship.target.node.keys", s"$targetColumn:$targetLabel")

        //NEO4J CONNECTION DETAILS
        .option("url", url)
        .option("authentication.type", "basic")
        .option("authentication.basic.username", username)
        .option("authentication.basic.password", password)
        .save()
}

I am inserting like this, but this approach inserting nodes and relationships one by one. but i have huge data.