You should also take into account amount of memory that you plan to use. It's advised not to give too much memory for each executor .. otherwise GC overhead will go up.
Btw, why prime numbers? -- Ruslan Dautkhanov On Wed, Jul 29, 2015 at 3:31 AM, ponkin <alexey.pon...@ya.ru> wrote: > Hi Rahul, > > Where did you see such a recommendation? > I personally define partitions with the following formula > > partitions = nextPrimeNumberAbove( K*(--num-executors * --executor-cores ) > ) > > where > nextPrimeNumberAbove(x) - prime number which is greater than x > K - multiplicator to calculate start with 1 and encrease untill join > perfomance start to degrade > > > > > -- > View this message in context: > http://apache-spark-user-list.1001560.n3.nabble.com/Spark-Number-of-Partitions-Recommendations-tp24022p24059.html > Sent from the Apache Spark User List mailing list archive at Nabble.com. > > --------------------------------------------------------------------- > To unsubscribe, e-mail: user-unsubscr...@spark.apache.org > For additional commands, e-mail: user-h...@spark.apache.org > >
