[jira] [Created] (SPARK-7277) property mapred.reduce.task replaced by spark.sql.shuffle.partitions

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

Sebastian created SPARK-7277:
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             Summary: property mapred.reduce.task replaced by spark.sql.shuffle.partitions
                 Key: SPARK-7277
                 URL: https://issues.apache.org/jira/browse/SPARK-7277
             Project: Spark
          Issue Type: Bug
    Affects Versions: 1.3.1
            Reporter: Sebastian


When I use "SET mapred.reduce.task" I get the warning "SetCommand: Property mapred.reduce.tasks is deprecated, automatically converted to spark.sql.shuffle.partitions instead."

It's true that mapred.reduce.task is deprecated but this replacement causes serious trouble:

Setting mapred.reduce.task to -1 (negative one) is valid and causes hadoop/hive to automatically determine the required number of reducers.

Setting spark.sql.shuffle.partitions to negative can cause spark to produce incorrect results.
In my system (spark-sql 1.3.1 running on a single machine in "local" mode), with this setting, any outer join produces no output (whereas an inner join does)



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