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Posted to issues@spark.apache.org by "Ritesh Agrawal (JIRA)" <ji...@apache.org> on 2015/08/25 15:05:46 UTC

[jira] [Created] (SPARK-10223) Add takeOrderedByKey function to extract top N records within each group

Ritesh Agrawal created SPARK-10223:
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             Summary: Add takeOrderedByKey function to extract top N records within each group
                 Key: SPARK-10223
                 URL: https://issues.apache.org/jira/browse/SPARK-10223
             Project: Spark
          Issue Type: New Feature
          Components: PySpark
            Reporter: Ritesh Agrawal
            Priority: Minor


Currently PySpark has takeOrdered function that returns top N records. However often you want to extract top N records within each group. This can be easily implemented using combineByKey operation and using fixed size heap to capture top N within each group. A working solution can be found over [here](https://ragrawal.wordpress.com/2015/08/25/pyspark-top-n-records-in-each-group/)



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