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https://issues.apache.org/jira/browse/SPARK-12245?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15049407#comment-15049407
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Apache Spark commented on SPARK-12245:
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User 'tdas' has created a pull request for this issue:
https://github.com/apache/spark/pull/10224
> Change the simple tracking function signature to include key in the params
> --------------------------------------------------------------------------
>
> Key: SPARK-12245
> URL: https://issues.apache.org/jira/browse/SPARK-12245
> Project: Spark
> Issue Type: Bug
> Reporter: Tathagata Das
> Assignee: Tathagata Das
> Priority: Blocker
>
> From initial experiences, not having the key in the function makes it hard to
> return mapped stuff, as the whole information of the records is not there.
> Basically the user is restricted to doing something like mapValue() instead
> of map().
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