Distribute dd evenly across nodes

[Lyndon-Li]

Fix issue #8242, distribute dd evenly across nodes

[codecov]

Codecov Report

Attention: Patch coverage is 82.35294% with 3 lines in your changes missing coverage. Please review.

Project coverage is 59.17%. Comparing base (5f7bf64) to head (b52b450).
Report is 7 commits behind head on main.

Files with missing lines	Patch %	Lines
pkg/exposer/generic_restore.go	82.35%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #8611      +/-   ##
==========================================
+ Coverage   59.15%   59.17%   +0.01%     
==========================================
  Files         370      370              
  Lines       39777    39794      +17     
==========================================
+ Hits        23532    23549      +17     
  Misses      14747    14747              
  Partials     1498     1498              

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