GrantPSpencer opened a new pull request, #2869:
URL: https://github.com/apache/helix/pull/2869

   ### Issues
   
   - [ ] My PR addresses the following Helix issues and references them in the 
PR description:
   
   https://github.com/apache/helix/issues/2818
   testDisableErrorLogByDefault in TestStatusUpdateUtil failing intermittently
   
   ### Description
   
   - [ ] Here are some details about my PR, including screenshots of any UI 
changes:
   There are 2 things at play here:
   1. TestParticipantManager's static field is setting 
STATEUPDATEUTIL_ERROR_PERSISTENCY_ENABLED to true. My assumption is that this 
code is executed early on when the JVM firsts loads these classes. This is why 
StatusUpdateUtil is pushing error logs to ZK in the first place
   2. Setting the static field's variable appears to not successfully propagate 
the changed value to the loaded class. This is why the logs are pushed to ZK 
despite using setFinalStatic to change the value to false. At this point I'm 
not sure why it fails - my very uneducated guess is that the jvm might be doing 
some optimization by having threads cache the variables and the change is not 
propagated properly. The observed behavior is that when reading the value of  
StatusUpdateUtil.ERROR_LOG_TO_ZK_ENABLED within TestStatusUpdateUtil will show 
false (set by setFinalStatic call), but the value when read within 
StatusUpdateUtil's publishErrorRecord will show true (original value). 
   
   I'm not sure this specific approach of having a static method to reassign 
the static variable is the best practice. Maybe it is better to modify 
StatusUpdateUtil so that it has a local variable taht can be set by its 
constructor, or that defaults to the system property value if no value 
provided. 
   
   ### Tests
   
   - [ ] The following tests are written for this issue:
   
   testDisableErrorLogByDefault
   
   - The following is the result of the "mvn test" command on the appropriate 
module:
   
   (If CI test fails due to known issue, please specify the issue and test PR 
locally. Then copy & paste the result of "mvn test" to here.)
   
   ### Commits
   
   - My commits all reference appropriate Apache Helix GitHub issues in their 
subject lines. In addition, my commits follow the guidelines from "[How to 
write a good git commit message](http://chris.beams.io/posts/git-commit/)":
     1. Subject is separated from body by a blank line
     1. Subject is limited to 50 characters (not including Jira issue reference)
     1. Subject does not end with a period
     1. Subject uses the imperative mood ("add", not "adding")
     1. Body wraps at 72 characters
     1. Body explains "what" and "why", not "how"
   
   ### Code Quality
   
   - My diff has been formatted using helix-style.xml 
   (helix-style-intellij.xml if IntelliJ IDE is used)
   


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