Chen Zhi created HADOOP-17295:
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             Summary: Move dedicated pre-logging statements into existing 
logging guards
                 Key: HADOOP-17295
                 URL: https://issues.apache.org/jira/browse/HADOOP-17295
             Project: Hadoop Common
          Issue Type: Improvement
            Reporter: Chen Zhi


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 a 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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