Trying to build a Map inside a map operation

test.scala

import javax.ws.rs.{QueryParam, GET, Produces, Path}
import scala.Array
import javax.ws.rs.core.{Response, MediaType}
import org.slf4j.{LoggerFactory, Logger}
import org.joda.time.format.{ISODateTimeFormat, DateTimeFormatter}
import org.joda.time.DateTimeZone

import com.securityx.modelfeature.dao.BeaconsDao
import com.fasterxml.jackson.databind.ObjectMapper
import com.fasterxml.jackson.module.scala.DefaultScalaModule
import com.securityx.modelfeature.FeatureServiceConfiguration
import com.sun.corba.se.spi.activation._ActivatorImplBase

import org.joda.time.MutableDateTime
import collection.mutable.ListBuffer
import collection.parallel.mutable

val conf = new FeatureServiceConfiguration
conf.setZkQuorum("hiveapp1,hiveapp2,hiveapp3")
conf.setEnvironment("DEV")
val beaconsDao = new BeaconsDao(conf)
val tableName = "DEV_BEACONS"

val buf = beaconsDao.getBeaconingSeries("2014-06-14T00:00:00.000Z", "2014-06-15T00:00:00.000Z", 3600)

// Need to group by source and dest
val groups = buf.groupBy(x => Map[String, Any]
  ("sourceNameOrIp" -> x.get("sourceNameOrIp"),
   "destinationNameOrIp" -> x.get("destinationNameOrIp")
  ))

groups.map {case(key, value) => (value.map{case(key2, value2) => (value)})}
groups.map {case(key, value) => (value.map{_.get("risk")})}

// Help me, I am trying to return a Map with fields "risk" and "eventTime"
groups.map {case(key, value) => (value.map{val x = Map()})}