Adrian, do you know if this is documented somewhere? I was also under the impression that setting a key's value to None would cause the key to be discarded (without any explicit filtering on the user's part) but can not find any official documentation to that effect

On Wed, Nov 12, 2014 at 2:43 PM, Adrian Mocanu <amocanu@verticalscope.com> wrote:
My understanding is that the reason you have an Option is so you could filter out tuples when None is returned. This way your state data won't grow forever.

-----Original Message-----
From: spr [mailto:spr@yarcdata.com]
Sent: November-12-14 2:25 PM
To: user@spark.incubator.apache.org
Subject: Re: "overloaded method value updateStateByKey ... cannot be applied to ..." when Key is a Tuple2

After comparing with previous code, I got it work by making the return a Some instead of Tuple2.  Perhaps some day I will understand this.


spr wrote
> ------code--------
>
>     val updateDnsCount = (values: Seq[(Int, Time)], state:
> Option[(Int,
> Time)]) => {
>       val currentCount = if (values.isEmpty) 0 else values.map( x =>
> x._1).sum
>       val newMinTime = if (values.isEmpty) Time(Long.MaxValue) else
> values.map( x => x._2).min
>
>       val (previousCount, minTime) = state.getOrElse((0,
> Time(System.currentTimeMillis)))
>
>       //  (currentCount + previousCount, Seq(minTime, newMinTime).min)
> <== old
>       Some(currentCount + previousCount, Seq(minTime, newMinTime).min)
> // <== new
>     }





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