[GitHub] [zookeeper] TisonKun opened a new pull request #1100: ZOOKEEPER-3509: Revisit log format

[GitBox <gi...@apache.org>]

TisonKun opened a new pull request #1100: ZOOKEEPER-3509: Revisit log format
URL: https://github.com/apache/zookeeper/pull/1100
 
 
   1. Always wrap `.trace` with `isTraceEnabled`. It is because that some of trace calls are a bit complex.
   2. Never wrap other levels with `isXXXEnabled`. Logger already checks log level and we don't make side effect or expensive operation in log statement.
   3. Always use `{}` instead of string concatenation or `String.format`. Just for unification and it is what is recommended.
   4. Always log throwable in warn or error level or debug if omit
   5. Always log throwable as the last arg and never log `throwable.getMessage` since Logger already log stack trace.

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