xushiyan commented on PR #5052:
URL: https://github.com/apache/hudi/pull/5052#issuecomment-1260593200

   > im explained in jira :https://issues.apache.org/jira/browse/HUDI-3644
   > 
   > when log file block append sucess. And deltacommit rollback. And this 
instance time is before activeTimeline starts. This log file block will be 
merged, cause data duplication.
   
   So the situation is: there is a deltacommit and a rollback commit, then 
archive happened and deltacommit archived. As @yihua mentioned 
`ROLLBACK_PREVIOUS_BLOCK` is to prevent merging invalid delta log data. So will 
proceed to close this.
   


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