You are correct; the filtering I’m talking about is done implicitly. You don’t have to do it yourself. Spark will do it for you and remove those entries from the state collection.
From: Yana Kadiyska [mailto:[email protected]] Sent: November-12-14 3:50 PM To: Adrian Mocanu Cc: spr; [email protected] Subject: Re: "overloaded method value updateStateByKey ... cannot be applied to ..." when Key is a Tuple2 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 <[email protected]<mailto:[email protected]>> 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:[email protected]<mailto:[email protected]>] Sent: November-12-14 2:25 PM To: [email protected]<mailto:[email protected]> 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 > } -- View this message in context: http://apache-spark-user-list.1001560.n3.nabble.com/overloaded-method-value-updateStateByKey-cannot-be-applied-to-when-Key-is-a-Tuple2-tp18644p18750.html Sent from the Apache Spark User List mailing list archive at Nabble.com. --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected]<mailto:[email protected]> For additional commands, e-mail: [email protected]<mailto:[email protected]> --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected]<mailto:[email protected]> For additional commands, e-mail: [email protected]<mailto:[email protected]>
