GitHub user dongjoon-hyun opened a pull request:
https://github.com/apache/spark/pull/21446
[SPARK-19613][SS][TEST] Random.nextString is not safe for directory
namePrefix
## What changes were proposed in this pull request?
`Random.nextString` is good for generating random string data, but it's not
suitable for directory name prefix. This PR uses more safe directory namePrefix.
```
scala> scala.util.Random.nextString(10)
res0: String = 馨ìá°á»ç©äå
©ã»è並
scala> scala.util.Random.nextInt.abs.toString
res1: String = 1016732284
```
## How was this patch tested?
Pass the Jenkins.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/dongjoon-hyun/spark SPARK-19613
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/21446.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 #21446
----
commit a46dc70d86a4f3f8387dc7c2125392de5a2cfb5e
Author: Dongjoon Hyun <dongjoon@...>
Date: 2018-05-28T15:53:22Z
[SPARK-19613][SS][TEST] Random.nextString is not safe for directory
namePrefix
----
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