Realizing Fault Resilience in Web-Server Cluster

6 downloads 13184 Views 211KB Size Report
Server cluster, consisting of multiple heterogeneous computers that appears as a ... Over the past few years, numerous Web server clustering schemes have ...
                                !"#"

       $   %     %  &''   "               ( " )   * +%            %         %      %

      " $       % %       %  +% (   % 

        ,        " +     (       

 %        "   %              -""  .     " #    ,           % +% "

    +++   %   %        $ " /     % +%     ,       $ "         

                0&12  %              " (       $             -"" 

 3 042 / 5 062  072.     " #      

 +%      %   "    %        8    09:2   0;      E!% 

      

   =       +%   % " +        (    +%      %   =      " /     %       %   =           *   %(  )= (     (  

           " )    

    %    )= (  -    %   .    %       %  



  %" $       

 %       

      %    % ,"       +% (           ,                 =" E  &  

   ,   %" Content-aware Distributor

Client 

   

   



 

   (1)







 



     

 



      

 

         







 

Server





 

 

 

 

  

  







  



       %    ,   %     -   % )= &"& 0&7&92. 

 %,  " +       )= (    %      =        *  ,    =H   ,    0&:2" /     ,  %       -* %  

 $=      %.    % -  %.     " $      =H     -"" (   % /   % ".   "  %    ,         =     " /    =            ,    )= (      !J -         , .   )=     " 3   (     %                   (     % "  !J %      -""       ?    ".      , 

  " + %        %     (    

    ,       %       "   %         %

         % %         ,   " /      %    %  



   (  , %   ,H $=   =      , %          ,                ?  ," +          (   % /   %   =          

  ,   " E   , %            "     0&;2     " $  %     E$ ,           

                %  %  

E$K! $5"  %       /  ,   E$ ,       )/JEK J#" +   ,  (      /   ,           J#"  %                  ,    %,   %    " $    )= &"'      %      E$          ,       ,   " E  %               ,  %    -  J *.            %      ,  * "  %        %    ,   -$ .     =C$= ," 3   ,              ,  %    ?  

 , ( ,"

   $     %     +% (   % 

    

           " #   (            ( ,      " +              ,       % 0&   

           F %G    %" /  ,         *         % " +     

 %

 %  

        +% ( " E  *

  

    % (    

             "                %,    " $       (   % 

     %     % % " $   6                  "

*    &  

%  %     % (           +% " )                % (          (    " + %              % ( 8 -&.       -""      (                  . -1. (    %   %      , -""   ."



       (    " $            %           %  " E      (      %      %        ,       " (      %         %       " $        *  %     %   " $ 

   

 *     

 +%         (       " +  ?   %    %      %    ?     %                      ?  " +      %           

  ""    %  

 %     +% "     %           %    

  %  ( " $           0;"  , 8 /   !

  % $ " $     : $  +  + +%   / &