geserdugarov commented on issue #12155:
URL: https://github.com/apache/hudi/issues/12155#issuecomment-2434961223

   But if we change hash function, there could be duplications due to some keys 
written to one bucket using current hash, and after hash fix, buckets could be 
different:
   ```Text
   Key:f1:abc,f2:bcd,123;       new hash: [abc, bcd,123];       current hash: 
[abc, bcd, 123];  new bucket = 2; current bucket = 1
   Key:f1:hij,f2:jkl,,x;        new hash: [hij, jkl,,x];        current hash: 
[hij, jkl, , x];  new bucket = 0; current bucket = 2
   Key:f1:123,f2:234,567;       new hash: [123, 234,567];       current hash: 
[123, 234, 567];  new bucket = 0; current bucket = 1
   Key:f1:234,f2:,,7,89;        new hash: [234, ,,7,89];        current hash: 
[234, , , 7, 89]; new bucket = 1; current bucket = 1
   ```


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