GitHub user dongjoon-hyun opened a pull request:
https://github.com/apache/spark/pull/13282
[SPARK-15512][CORE] repartition(0) should raise IllegalArgumentException
## What changes were proposed in this pull request?
Previously, SPARK-8893 added the constraints on positive number of
partitions for repartition/coalesce operations in general. This PR adds one
missing part for that and adds explicit two testcases.
**Before**
```scala
scala> sc.parallelize(1 to 5).coalesce(0).collect()
java.lang.IllegalArgumentException: requirement failed: Number of
partitions (0) must be positive.
...
scala> sc.parallelize(1 to 5).repartition(0).collect()
res1: Array[Int] = Array() // empty
```
**After**
```scala
scala> sc.parallelize(1 to 5).coalesce(0).collect()
java.lang.IllegalArgumentException: requirement failed: Number of
partitions (0) must be positive.
...
scala> sc.parallelize(1 to 5).repartition(0).collect()
java.lang.IllegalArgumentException: requirement failed: Number of
partitions (0) must be positive.
...
```
## How was this patch tested?
Pass the Jenkins tests with new testcases.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/dongjoon-hyun/spark SPARK-15512
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/13282.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #13282
----
commit 6848004a457eefbe6c5b25f67889ed53ae1cb036
Author: Dongjoon Hyun <dongj...@apache.org>
Date: 2016-05-24T21:48:32Z
[SPARK-15512][CORE] repartition(0) should raise IllegalArgumentException.
----
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