scala - Overloaded method value createDirectStream in error Spark Streaming -

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when making call 

val kafkaparams: map[string, string] =... var topic: string = .. val input2 = kafkautils.createdirectstream[string, string, stringdecoder, stringdecoder](ssc, kafkaparams, topic.toset)

i error:

overloaded method value createdirectstream alternatives: (jssc: org.apache.spark.streaming.api.java.javastreamingcontext,keyclass: class[string],valueclass: class[string],keydecoderclass: class[kafka.serializer.stringdecoder],valuedecoderclass: class[kafka.serializer.stringdecoder],kafkaparams: java.util.map[string,string],topics: java.util.set[string])org.apache.spark.streaming.api.java.javapairinputdstream[string,string] (ssc: org.apache.spark.streaming.streamingcontext,kafkaparams: scala.collection.immutable.map[string,string],topics: scala.collection.immutable.set[string])(implicit evidence$19: scala.reflect.classtag[string], implicit evidence$20: scala.reflect.classtag[string], implicit evidence$21: scala.reflect.classtag[kafka.serializer.stringdecoder], implicit evidence$22: scala.reflect.classtag[kafka.serializer.stringdecoder])org.apache.spark.streaming.dstream.inputdstream[(string, string)] cannot applied (org.apache.spark.streaming.streamingcontext, scala.collection.immutable.map[string,string], scala.collection.immutable.set[char])

i similar error when calling parameterised version of createstream.

any idea what's issue?

that long message topics needs set[string], not set[char].

the best way can see fix do:

topic.map(_.tostring).toset

but, if have 1 topic, set(topic) above splits string set of single characters.


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