Cpaulyz opened a new pull request, #7995:
URL: https://github.com/apache/iotdb/pull/7995

   ## Description
   
   In the original process, recovery in SchemaFile mode will overwrite the .pst 
file and redo all the plans in MLog. 
   
   However, it causes unnecessary additional I/O cost. Therefore, the records 
in the mlog can be removed after flushing the .pst file. When recovering, we 
only need to redo the plans in the mlog that have not been persisted into the 
.pst file.


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