coder-chenzhi opened a new pull request #2358:
URL: https://github.com/apache/hadoop/pull/2358


   I find some cases where some pre-processing statements dedicated to logging 
calls are not guarded by existing logging guards. Most of them are easy to fix. 
And I create this PR to fix them.
   
   These issues are detected by a static analysis tool wrote by myself. This 
tool can extract all the dedicated statements for each debug-logging calls 
(i.e., the results of these statements are only used by debug-logging calls). 
Because I realize that debug logs will incur overhead in production, such as 
string concatenation and method calls in the parameters of logging calls. And I 
want to perform a systematic evaluation for the overhead of debugging logging 
calls in production.


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