I had like to be corrected on this but I am just trying to say small enough of the order of few 100 MBs. Imagine the size gets shipped to all nodes, it can be a GB but not GBs and then depends on the network too.

Prashant Sharma

On Fri, May 2, 2014 at 6:42 PM, Diana Carroll <dcarroll@cloudera.com> wrote:
Anyone have any guidance on using a broadcast variable to ship data to workers vs. an RDD?  

Like, say I'm joining web logs in an RDD with user account data.  I could keep the account data in an RDD or if it's "small", a broadcast variable instead.  How small is small?  Small enough that I know it can easily fit in memory on a single node?  Some other guideline?