Github user ktsakalozos commented on the issue:
https://github.com/apache/bigtop/pull/123
Hi Kevin, as per our yesterday's discussion we agreed to favour explicit
relations even if they seem redundant. The user is indeed required to add a
relation between openjdk and mahout. If we are to remove that requirement charm
authors that want their charms to relate to mahout would also need to relate to
java and make sure java is available before mahout deployment is triggered.
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