dwangatt commented on PR #8583:
URL: https://github.com/apache/paimon/pull/8583#issuecomment-4978923485

   > When `size-aware-batch` is enabled and 
`scan.split-enumerator.mode=preemptive`, the source ignores the bucket grouping 
function, but the sink skips the bucket shuffle. Multiple splits from the same 
bucket may end up in different writers, resulting in concurrent full 
compaction. It is recommended to enforce or validate `FAIR`, or to implement 
grouping and allocation for `PREEMPTIVE`.
   
   @JingsongLi thanks for review. Good point! I updated this PR - 
size-aware-batch option only works with `FAIR` mode. `size-aware-batch` 
requires all writers ready to eliminate long tail writers. In preemptive mode, 
current `LINEAR` can work well.


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