[Hadoop Wiki] Update of "CodeReviewChecklist" by SharadAgarwal

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The following page has been changed by SharadAgarwal:
http://wiki.apache.org/hadoop/CodeReviewChecklist

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   * if {{{equals}}} is overridden then {{{hashCode}}} is overridden (and vice versa)
   * objects are checked ({{{instanceof}}}) for appropriate type before casting (use generics if possible)
   * public API changes have been publically discussed
+  * use of static member variables should be used with caution especially in Map/reduce tasks due to the JVM reuse feature
  
  == Tests ==