GallonREX commented on issue #7925:
URL: https://github.com/apache/hudi/issues/7925#issuecomment-1516181619

   > Generally multi-writering capablity means, both the writer can write 
concurrently only if they don't have overlapping data being ingested. for eg, 
if both are ingesting to two different partitions completely. If not, hudi may 
not be able to resolve the winner and hence will abort/fail one of the writer.
   > 
   > Its expected.
   > 
   > Can you clarify if two writers are writing non-overlapping data and still 
results in concurrent modification exception.
   
   In the case of the same data, if hudi 0.8 is used for the newly created 
table, multiple writers can write successfully, and if hudi 0.12 is used for 
the newly created table, multiple writers can also write successfully. But 
using hudi 0.12 multi-writer to write to the existing hudi 0.8 table fails.
   I just used hudi 0.12 to directly write to an existing hudi 0.8 table. It is 
expected that the table version can be automatically upgraded.
   Can the tables from hudi 0.8 to hudi 0.12 be automatically upgraded?


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