If that’s the case, I think mapPartition is what you need, but it seems that 
you have to load the partition into the memory as whole by toArray

rdd.mapPartition{D => {val p = D.toArray; ...}}  

--  
Nan Zhu



On Tuesday, April 8, 2014 at 8:40 AM, wxhsdp wrote:

> yes, how can i do this conveniently? i can use filter, but there will be so
> many RDDs and it's not concise
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