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Posted to commits@hudi.apache.org by GitBox <gi...@apache.org> on 2021/08/04 07:53:13 UTC

[GitHub] [hudi] dmenin commented on issue #3394: [SUPPORT] Question on hudi's default behaviour for UPSERT

dmenin commented on issue #3394:
URL: https://github.com/apache/hudi/issues/3394#issuecomment-892446743


   Hi Sivabalan,
   Thanks very much for taking the time to reply.
   A few questions:
   
   1) the config value you linked seem to only applies to GLOBAL_BLOOM index. I am using GLOBAL_SIMPLE, so I don’t think it applies to my case.
   
   2) You mentioned “preCombine”. My understanding is that preCombine works before the write…. If I have two records with the same key, preCombine will choose the one with largest value and the “submit” the insert command – so it shouldn’t affect the calculations between input data and existing data, correct? Since we only have 1 new row on the insert, it seems that preCombine is also not relevant in this case.
   
   Could you clarify further, please?
   Thanks,
   Diego
   
   


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