morningman opened a new pull request, #10005:
URL: https://github.com/apache/incubator-doris/pull/10005

   # Proposed changes
   
   Issue Number: close #xxx
   
   ## Problem Summary:
   
   In #6207, we change the meta image format, add header and footer to save 
some information about the image file,
   so that we can more easily read data in it.
   
   This CL mainly changes:
   1. Move all image read and write class to a new package 
`org.apache.doris.persist.meta`
   2. Refactor the MetaReader and MetaWriter, so that we can easier to add new 
meta modules in image.
   3. Read the meta module in image using the information saved in meta footer, 
so that we are able to add new modules without changing the FeMetaVersion.
   
   This CL **does not change any content or format of the image file**. Just 
the modify the read and write method of it.
   
   ## Checklist(Required)
   
   1. Does it affect the original behavior: (No)
   5. Has unit tests been added: (Yes)
   6. Has document been added or modified: (No Need)
   7. Does it need to update dependencies: (No)
   8. Are there any changes that cannot be rolled back: (No)
   
   ## Further comments
   
   If this is a relatively large or complex change, kick off the discussion at 
[d...@doris.apache.org](mailto:d...@doris.apache.org) by explaining why you 
chose the solution you did and what alternatives you considered, etc...
   


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