alexkingli opened a new pull request #1300: update updateMapIncr to avoid 
loading information form os every time
URL: https://github.com/apache/hadoop/pull/1300
 
 
   If the user group does not exist, there will be a lot of invoking the 
updateMapIncr . And it is the synchronized methods,it really affects 
performance. 
   
   
   
   
   
   

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