fengjian428 commented on pull request #3252:
URL: https://github.com/apache/hudi/pull/3252#issuecomment-877659442


   > > > > what is the different between insert and append only?
   > > > 
   > > > 
   > > > The append-only mode's behavior is to write data to the new base file 
without index. You can view the changed files.
   > > 
   > > 
   > > is insert mode need scan index?
   > 
   > In Flink stream, insert mode don't need scan index, but it is possible to 
assign it to exists fileId and merge it.
   > The append-only mode avoid this happened when record don't update.
   
   yes  thank you ,  this mode like kind of write into new file directly 
operation


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