gelly scatter/gather

[Alieh]

Hi all

I have an iterative algorithm implemented using Gelly scatter/gather. 
Using 8 workers of a cluster, I encounter the error 
"akka.pattern.AskTimeoutException", which I think the reason is heap 
size. Surprisingly, using 4 workers of the same cluster, my program is 
executed!!! It seems that I have some I/O with 4 workers, but why using 
8 workers I can not run the job?

Best,

Alieh