[jira] [Created] (SPARK-14408) Is RDD.treeAggregate implemented correctly?

["Joseph K. Bradley (JIRA)" <ji...@apache.org>]

Joseph K. Bradley created SPARK-14408:
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             Summary: Is RDD.treeAggregate implemented correctly?
                 Key: SPARK-14408
                 URL: https://issues.apache.org/jira/browse/SPARK-14408
             Project: Spark
          Issue Type: Question
          Components: Spark Core
            Reporter: Joseph K. Bradley


**Issue**
In MLlib, we have assumed that {{RDD.treeAggregate}} allows the {{seqOp}} and {{combOp}} functions to modify and return their first argument, just like {{RDD.aggregate}}.  However, it is not documented that way.

I started to add docs to this effect, but then noticed that {{treeAggregate}} uses {{reduceByKey}} and {{reduce}} in its implementation, neither of which technically allows the seq/combOps to modify and return their first arguments.

**Question**: Is the implementation safe, or does it need to be updated?



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