Hi,

It is a common pattern to process an RDD, collect (typically a subset) to the 
driver and then broadcast back.

Adding an RDD method that can do that using the torrent broadcast mechanics 
would be much more efficient. In addition, it would not require the Driver to 
also utilize its Heap holding this broadcast.

I guess this can become complicated if the resulting broadcast is required to 
keep lineage information, but assuming a torrent distribution, once the 
broadcast is synced then lineage would not be required. I’d also expect the 
call to rdd.brodcast to be an action that eagerly distributes the broadcast and 
returns when the operation has succeeded.

Is this something that could be implemented or are there any reasons that 
prohibits this?

Thanks
Ioannis


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