i see it works well,thank you!!! But in follow situation how to do
var a = sc.textFile("/sparktest/1/").map((_,"a")) var b = sc.textFile("/sparktest/2/").map((_,"b")) How to get (3,"a") and (4,"a")???? 在 Aug 28, 2014,19:54,"Matthew Farrellee" <m...@redhat.com> 写道: > On 08/28/2014 07:20 AM, marylucy wrote: >> fileA=1 2 3 4 one number a line,save in /sparktest/1/ >> fileB=3 4 5 6 one number a line,save in /sparktest/2/ >> I want to get 3 and 4 >> >> var a = sc.textFile("/sparktest/1/").map((_,1)) >> var b = sc.textFile("/sparktest/2/").map((_,1)) >> >> a.filter(param=>{b.lookup(param._1).length>0}).map(_._1).foreach(println) >> >> Error throw >> Scala.MatchError:Null >> PairRDDFunctions.lookup... > > the issue is nesting of the b rdd inside a transformation of the a rdd > > consider using intersection, it's more idiomatic > > a.intersection(b).foreach(println) > > but not that intersection will remove duplicates > > best, > > > matt > > --------------------------------------------------------------------- > To unsubscribe, e-mail: user-unsubscr...@spark.apache.org > For additional commands, e-mail: user-h...@spark.apache.org >