[jira] [Commented] (SPARK-12244) Rename trackStateByKey to mapWithState

["Apache Spark (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SPARK-12244?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15049361#comment-15049361 ] 

Apache Spark commented on SPARK-12244:
--------------------------------------

User 'tdas' has created a pull request for this issue:
https://github.com/apache/spark/pull/10224

> Rename trackStateByKey to mapWithState
> --------------------------------------
>
>                 Key: SPARK-12244
>                 URL: https://issues.apache.org/jira/browse/SPARK-12244
>             Project: Spark
>          Issue Type: Bug
>          Components: Streaming
>            Reporter: Tathagata Das
>            Assignee: Tathagata Das
>
> Based on feedback from early users and personal experience attempting to explain it, the name trackStateByKey had two problem.
> - "trackState" is a completely new term which really does not give any intuition on what the operation is
> - the resultant data stream of objects returned by the function is called in docs as the "emitted" data for the lack of a better. 
> "mapWithState" makes sense because the API is like a mapping function like (Key, Value) => T with State as an additional parameter. The resultant data stream is "mapped data". So both problems are solved.



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