Maximum Size of Reference Look Up Table in Spark

[Saravanan Subramanian]

Hello All,
I am in the middle of designing real time data enhancement services using spark 
streaming.  As part of this, I have to look up some reference data while 
processing the incoming stream.
I have below questions:
1) what is the maximum size of look up table / variable can be stored as 
Broadcast variable ()2) What is the impact of cluster performance, if I store a 
10GB data in broadcast variable
Any suggestions and thoughts are welcome.
Thanks,Saravanan S.