How severe does this issue affect your experience of using Ray?
- High: It blocks me to complete my task.
I am testing the abilities of Ray 
Till the above notebook code blocks everything seems good, but when I run this :
For more than 22 minutes this code block is running without any progress on the task (according to the progress bar) Also it is using only 2 threads in my machine (I have a machine with Intel i5 processor (I think 8 threads ))
It has spilled around 66340 MiB data which seems very high and the task is not even moving ahead
I think there are many spilled workers coming up in the htop output on my terminal. Also for some reason there are many ray::IDLE workers as well.