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Posted to commits@hudi.apache.org by GitBox <gi...@apache.org> on 2021/06/16 03:27:13 UTC

[GitHub] [hudi] n3nash commented on issue #3078: [SUPPORT] combineAndGetUpdateValue is not getting called when Schema evolution happens

n3nash commented on issue #3078:
URL: https://github.com/apache/hudi/issues/3078#issuecomment-862008843


   @tandonraghav To expect the payload semantics for compaction, you need to override the `preCombine` implementation and have the same implementation across `combineAndGetUpdateValue` and `preCombine`. The idea is that whether it is 2 records in memory, 2 records on disk or 1 record in memory vs 1 on disk -> we call either `preCombine` or `combineAndGetUpdateValue` depending on what can be constructed as a payload. 
   
   Please try overriding preCombine and let me know if you still see problems. We might open a documentation around this to make it more clear. 


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