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https://issues.apache.org/jira/browse/SPARK-4481?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Tathagata Das resolved SPARK-4481.
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Resolution: Fixed
Fix Version/s: 1.2.0
> Some comments for `updateStateByKey` are wrong
> ----------------------------------------------
>
> Key: SPARK-4481
> URL: https://issues.apache.org/jira/browse/SPARK-4481
> Project: Spark
> Issue Type: Documentation
> Components: Streaming
> Affects Versions: 1.1.0
> Reporter: Shixiong Zhu
> Assignee: Shixiong Zhu
> Fix For: 1.2.0, 1.3.0
>
>
> The following `updateStateByKey` overloads have wrong description for
> `updateFunc`
> {code:java}
> /**
> * @param updateFunc State update function. If `this` function returns
> None, then
> * corresponding state key-value pair will be eliminated.
> Note, that
> * this function may generate a different a tuple with a
> different key
> * than the input key. It is up to the developer to
> decide whether to
> * remember the partitioner despite the key being changed.
> */
> def updateStateByKey[S: ClassTag](
> updateFunc: (Iterator[(K, Seq[V], Option[S])]) => Iterator[(K, S)],
> partitioner: Partitioner,
> rememberPartitioner: Boolean
> ): DStream[(K, S)]
> /**
> * @param updateFunc State update function. If `this` function returns
> None, then
> * corresponding state key-value pair will be eliminated.
> Note, that
> * this function may generate a different a tuple with a
> different key
> * than the input key. It is up to the developer to
> decide whether to
> * remember the partitioner despite the key being changed.
> */
> def updateStateByKey[S: ClassTag](
> updateFunc: (Iterator[(K, Seq[V], Option[S])]) => Iterator[(K, S)],
> partitioner: Partitioner,
> rememberPartitioner: Boolean,
> initialRDD: RDD[(K, S)]
> ): DStream[(K, S)]
> {code}
> ` If `this` function returns None, then corresponding state key-value pair
> will be eliminated.` should be removed.
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