[jira] [Created] (SPARK-3622) Provide a custom transformation that can output multiple RDDs

["Xuefu Zhang (JIRA)" <ji...@apache.org>]

Xuefu Zhang created SPARK-3622:
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             Summary: Provide a custom transformation that can output multiple RDDs
                 Key: SPARK-3622
                 URL: https://issues.apache.org/jira/browse/SPARK-3622
             Project: Spark
          Issue Type: Improvement
          Components: Spark Core
    Affects Versions: 1.1.0
            Reporter: Xuefu Zhang


All existing transformations return just one RDD at most, even for those which takes user-supplied functions such as mapPartitions() . However, sometimes a user provided function may need to output multiple RDDs. For instance, a filter function that divides the input RDD into serveral RDDs. While it's possible to get multiple RDDs by transforming the same RDD multiple times, it may be more efficient to do this concurrently in one shot. Especially user's existing function is already generating different data sets.

This the case in Hive on Spark, where Hive's map function and reduce function can output different data sets to be consumed by subsequent stages.



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