Github user karol-brejna-i commented on the issue:
https://github.com/apache/incubator-gearpump/pull/241
One more thing to discuss:
In yarn code we already have a trait named `Command`:
experiments/yarn/src/main/scala/org/apache/gearpump/experiments/yarn/appmaster/Command.scala
Do we care (maybe we could rename the old one or find a "better" name for
the new one) or we don't mind?---
