Github user 1ambda commented on the issue:
https://github.com/apache/zeppelin/pull/1689
@bzz Sorry for confusing. Let me explain more details.
- without `-Ploose-checkstyle`, maven will print all WARNINGs. So people
will see these warnings while developing (**default**)
- with `-Ploose-checkstyle`, maven will **not** print warnings at all. This
prevent 4MB log size limitation in travis CI
- Initially, `CHECKSTYLE=1` profile was introduced to get people awared
about warnings but it causes build failure since we have verbose zeppelin log
(too many info log. it's not good). So I removed that profile. Additionally,
`CHECKSTYLE=1` profile is meaningless because other profiles do checkstyle also
currently. (FYI, splitting checkstyle doesn't reduce total build time much.
approx 5 secs as i know)
So I would like to add `CHECKSTYLE=1` profile after regulate some logging
levels, fixing checkstyle rules (WARN -> ERROR)
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