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From Deepak Sharma <deepakmc...@gmail.com>
Subject Re: RDD for loop vs foreach
Date Tue, 12 Jul 2016 16:42:27 GMT
Hi Phil
I guess for() is executed on the driver while foreach() will execute it in
parallel.
You can try this without collecting the rdd try both .
foreach in this case would print on executors and you would not see
anything on the driver console.
Thanks
Deepak


On Tue, Jul 12, 2016 at 9:28 PM, philipghu <philguangyan@gmail.com> wrote:

> Hi,
>
> I'm new to Spark and Scala as well. I understand that we can use foreach to
> apply a function to each element of an RDD, like rdd.foreach
> (x=>println(x)), but I saw we can also do a for loop to print each element
> of an RDD, like
>
> for (x <- rdd){
> println(x)
> }
>
> Does defining the foreach function in RDD make an RDD traversable like
> this?
> Does the compiler automatically invoke the foreach function when it sees a
> for loop?
>
>
> Thanks!
> Phil
>
>
>
>
>
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-- 
Thanks
Deepak
www.bigdatabig.com
www.keosha.net

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