FMX opened a new pull request, #2986:
URL: https://github.com/apache/celeborn/pull/2986

   ### What changes were proposed in this pull request?
   Fix the issue of losing the primary location when parsing 
`GetReducerFileGroupResponse` from `LifecycleManager`.
   
   
   ### Why are the changes needed?
   In previous optimizations, I introduced packed partition locations to reduce 
the size of RPC calls, based on the assumption that primary partition locations 
would always be available. However, in some test scenarios where data 
replication is enabled and workers are randomly terminated, the primary 
location may be lost while the replica location remains. This causes the 
replica locations to be ignored which will cause data loss.
   
   
   
   ### Does this PR introduce _any_ user-facing change?
   NO.
   
   
   ### How was this patch tested?
   GA and cluster.
   


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