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[SPARK-21508][DOC] Fix example code provided in Spark Streaming Docum…
…entation ## What changes were proposed in this pull request? JIRA ticket : [SPARK-21508](https://issues.apache.org/jira/projects/SPARK/issues/SPARK-21508) correcting a mistake in example code provided in Spark Streaming Custom Receivers Documentation The example code provided in the documentation on 'Spark Streaming Custom Receivers' has an error. doc link : https://spark.apache.org/docs/latest/streaming-custom-receivers.html ``` // Assuming ssc is the StreamingContext val customReceiverStream = ssc.receiverStream(new CustomReceiver(host, port)) val words = lines.flatMap(_.split(" ")) ... ``` instead of `lines.flatMap(_.split(" "))` it should be `customReceiverStream.flatMap(_.split(" "))` ## How was this patch tested? this documentation change is tested manually by jekyll build , running below commands ``` jekyll build jekyll serve --watch ``` screen-shots provided below ![screenshot1](https://user-images.githubusercontent.com/8828470/28744636-a6de1ac6-7482-11e7-843b-ff84b5855ec0.png) ![screenshot2](https://user-images.githubusercontent.com/8828470/28744637-a6def496-7482-11e7-9512-7f4bbe027c6a.png) Author: Remis Haroon <Remis.Haroon@insdc01.pwc.com> Closes #18770 from remisharoon/master.
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