mapPartitions use case

Dear all, Sorry for asking such a basic question, but someone can explain when one should use mapPartiontions instead of map. Thanks Jaonary

Re: mapPartitions use case

I've seen two cases most commonly: The first is when I need to create some processing object to process each record. If that object creation is expensive, creating one per record becomes prohibitive. So instead, we use mapPartition, and create one per partition, and use it on each record in the