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From tdas <...@git.apache.org>
Subject [GitHub] spark pull request: [SPARK-2629][STREAMING] Basic implementation o...
Date Mon, 09 Nov 2015 07:03:21 GMT
Github user tdas commented on a diff in the pull request:

    https://github.com/apache/spark/pull/9256#discussion_r44245704
  
    --- Diff: streaming/src/main/scala/org/apache/spark/streaming/StateSpec.scala ---
    @@ -0,0 +1,181 @@
    +/*
    + * Licensed to the Apache Software Foundation (ASF) under one or more
    + * contributor license agreements.  See the NOTICE file distributed with
    + * this work for additional information regarding copyright ownership.
    + * The ASF licenses this file to You under the Apache License, Version 2.0
    + * (the "License"); you may not use this file except in compliance with
    + * the License.  You may obtain a copy of the License at
    + *
    + *    http://www.apache.org/licenses/LICENSE-2.0
    + *
    + * Unless required by applicable law or agreed to in writing, software
    + * distributed under the License is distributed on an "AS IS" BASIS,
    + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    + * See the License for the specific language governing permissions and
    + * limitations under the License.
    + */
    +
    +package org.apache.spark.streaming
    +
    +import scala.reflect.ClassTag
    +
    +import org.apache.spark.annotation.Experimental
    +import org.apache.spark.api.java.JavaPairRDD
    +import org.apache.spark.rdd.RDD
    +import org.apache.spark.{HashPartitioner, Partitioner}
    +
    +
    +/**
    + * :: Experimental ::
    + * Abstract class representing all the specifications of the DStream transformation
    + * `trackStateByKey` operation of a
    + * [[org.apache.spark.streaming.dstream.PairDStreamFunctions pair DStream]] (Scala) or
a
    + * [[org.apache.spark.streaming.api.java.JavaPairDStream JavaPairDStream]] (Java).
    + * Use the [[org.apache.spark.streaming.StateSpec StateSpec.apply()]] or
    + * [[org.apache.spark.streaming.StateSpec StateSpec.create()]] to create instances of
    + * this class.
    + *
    + * Example in Scala:
    + * {{{
    + *    val spec = StateSpec(trackingFunction).numPartitions(10)
    + *
    + *    val emittedRecordDStream = keyValueDStream.trackStateByKey[StateType, EmittedDataType](spec)
    + * }}}
    + *
    + * Example in Java:
    + * {{{
    + *    StateStateSpec[StateType, EmittedDataType] spec =
    + *      StateStateSpec.create[StateType, EmittedDataType](trackingFunction).numPartition(10);
    + *
    + *    JavaDStream[EmittedDataType] emittedRecordDStream =
    + *      javaPairDStream.trackStateByKey[StateType, EmittedDataType](spec);
    + * }}}
    + */
    +@Experimental
    +sealed abstract class StateSpec[K, V, S, T] extends Serializable {
    +
    +  /** Set the RDD containing the initial states that will be used by `trackStateByKey`*/
    --- End diff --
    
    I am cool with what matei said - function on the object, not on the class. just want to
point out that the original confusion raised by @pwendell -- not having `function` (i.e. setters
for function) on StateSpec class was confusing for him. @pwendell do you think, with the updated
docs, is it still a concern?


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