"collecting" DStream data

[Daniel Haviv]

Hi,
I have a DStream I'd like to collect and broadcast it's values.
To do so I've created a mutable HashMap which i'm filling with foreachRDD
but when I'm checking it, it remains empty. If I use ArrayBuffer it works
as expected.

This is my code:

val arr = scala.collection.mutable.HashMap.empty[String,String]
MappedVersionsToBrodcast.foreachRDD(r=> { r.foreach(r=> { arr+=r})   } )


What am I missing here?

Thank you,
Daniel