GitHub user dongjoon-hyun opened a pull request:
https://github.com/apache/spark/pull/12018
[SPARK-14219][GraphX] Fix `pickRandomVertex` not to fall into infinite
loops for graphs with one vertex
## What changes were proposed in this pull request?
Currently, `GraphOps.pickRandomVertex()` falls into infinite loops for
graphs having only one vertex. This issue fixes it by modifying the following
termination-checking condition.
```scala
- if (selectedVertices.count > 1) {
+ if (selectedVertices.count > 0) {
```
## How was this patch tested?
Pass the Jenkins tests (including new test case).
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/dongjoon-hyun/spark SPARK-14219
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/12018.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 #12018
----
commit 1691d9d1c92d25c190258f29598f8823feb8f7eb
Author: Dongjoon Hyun <dongj...@apache.org>
Date: 2016-03-28T23:53:59Z
[SPARK-14219] Fix `pickRandomVertex` not to fall into infinite loops for
graphs with one vertex
----
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