Github user GJL commented on a diff in the pull request:
https://github.com/apache/flink/pull/4889#discussion_r157481924
--- Diff: pom.xml ---
@@ -125,6 +125,9 @@ under the License.
<powermock.version>1.6.5</powermock.version>
<hamcrest.version>1.3</hamcrest.version>
<japicmp.skip>false</japicmp.skip>
+ <!-- empty placeholder for the flip6 build profile -->
--- End diff --
nit: I don't understand this comment. Shouldn't it be something like
```<!-- run all groups except flip6 by default -->``` ?
---
