Hi, a few words about me: I've contributed to Hadoop (and it's ecosystem) in the past am a Hive committer and have used Hadoop for 10 years now, so I'm not totally inexperienced. I'm earning my money as a Hadoop consultant so I've seen dozens of real-life clusters in my life.
As part of a few recent client projects and now writing about Hadoop in a new project/book I'm digging into the source code to figure out some of the things that are not documented. But as part of this digging I'm seeing lots of warnings in the code, inconsistencies etc. and I'd like to contribute some fixes to this back to the community. I have been a long-time believer in good code quality and consistent code styles. This might affect people like me especially who do a lot of "drive-by" contributions as I'm not someone who looks at the code daily but comes across it reasonably often as part of client engagements. In those scenarios, it's very unhelpful to have inconsistent code & bad documentation. Two simple but concrete examples: * There's lots of "final" usages on variables and methods but no consistency. Was this done for particular reasons or personal preference? * Similarly, there's lots of things that are public or protected while they could in theory be private. This especially makes it very hard to reason about code. Judging from the current code there's lots of "unofficial" code styling and/or personal preference. The Wiki says to follow the Sun guidelines which have not been updated in almost 20 years. A new version is in the works an clarifies a lot of things. I'm trying to get it published soon. I'd try to format according to the latter (that means among other things no "final" for local variables). I realize that I won't be able to single-handedly fix all of this especially as code gets contributed but if the community thinks it's worthwhile I'd still love to land a few cleanup patches. My experience in the past has been that it's hard to get attention to these things (which I fully understand as they take up someone's time to review & commit). So, this is my request for comments on these questions: * Is there any interest in this at all? ** "This" being patches for code style & things like FindBugs & Checkstyle warnings * Size of the patches: Rather one big patch or smaller ones (e.g. per file or package) * Anyone willing to help me with this? e.g. reviewing and committing? I'd be more than happy to bribe you with drinks, sweets, food or something else My plan is not to go through each and every file and fix every issue I see. But there are some specific areas I'm looking at in detail and there I'd love to contribute back. Thank you for reading! Cheers, Lars PS: Posting to common-dev only, not sure if I should cross post to hdfs-dev and yarn-dev as well?  <https://wiki.apache.org/hadoop/CodeReviewChecklist>  < http://www.oracle.com/technetwork/java/javase/documentation/codeconvtoc-136057.html >  <http://cr.openjdk.java.net/~alundblad/styleguide/index-v6.html>  < https://issues.apache.org/jira/issues/?filter=-1&jql=reporter%20%3D%20lars_francke%20OR%20assignee%20%3D%20lars_francke >