Github user zsxwing commented on a diff in the pull request:
https://github.com/apache/spark/pull/10224#discussion_r47154432
--- Diff:
streaming/src/main/scala/org/apache/spark/streaming/StateSpec.scala ---
@@ -91,92 +96,93 @@ sealed abstract class StateSpec[KeyType, ValueType,
StateType, EmittedType] exte
/**
* :: Experimental ::
* Builder object for creating instances of
[[org.apache.spark.streaming.StateSpec StateSpec]]
- * that is used for specifying the parameters of the DStream
transformation `trackStateByKey`
+ * that is used for specifying the parameters of the DStream
transformation `mapWithState`
* that is used for specifying the parameters of the DStream transformation
- * `trackStateByKey` operation of a
+ * `mapWithState` operation of a
* [[org.apache.spark.streaming.dstream.PairDStreamFunctions pair
DStream]] (Scala) or a
* [[org.apache.spark.streaming.api.java.JavaPairDStream JavaPairDStream]]
(Java).
*
* Example in Scala:
* {{{
- * def trackingFunction(data: Option[ValueType], wrappedState:
State[StateType]): EmittedType = {
+ * def mappingFunction(data: Option[ValueType], wrappedState:
State[StateType]): MappedType = {
* ...
* }
*
- * val emittedRecordDStream =
keyValueDStream.trackStateByKey[StateType, EmittedDataType](
- * StateSpec.function(trackingFunction).numPartitions(10))
+ * val spec = StateSpec.function(mappingFunction).numPartitions(10)
--- End diff --
I remember this line cannot be put here because the compiler cannot infer
`KeyType`.
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