Github user chenghao-intel commented on the pull request:
https://github.com/apache/spark/pull/2589#issuecomment-58293140
Sorry for late reply.
@rxin `sc.sparkContext.defaultMinPartitions` is 2 in the unit test, and
probably always be 2 in a real cluster deployment.
@marmbrus some of the hive unit test will use `SORT BY` instead of `ORDER
BY` in `SELECT` clause (e.g. `ctas.q`), different split strategies may lead to
different result for Hive and SparkSQL.
I agree we should respect the configuration `mapred.map.tasks`. which
change below do you prefer?
```
private val _minSplitsPerRDD = math.min(
sc.hiveconf.getInt("mapred.map.tasks", 1),
sc.sparkContext.defaultMinPartitions)
```
```
private val _minSplitsPerRDD = sc.hiveconf.getInt("mapred.map.tasks", 1)
```
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