number of executors in sparkR.init()

[Franc Carter]

Hi,

I'm having trouble working out how to get the number of executors set when
using sparkR.init().

If I start sparkR with

  sparkR  --master yarn --num-executors 6

then I get 6 executors

However, if start sparkR with

  sparkR

followed by

  sc <- sparkR.init(master="yarn-client",
sparkEnvir=list(spark.num.executors='6'))

then I only get 2 executors.

Can anyone point me in the direction of what I might doing wrong ? I need
to initialise this was so that rStudio can hook in to SparkR

thanks

-- 
Franc