zhengchenyu commented on issue #1249:
URL: 
https://github.com/apache/incubator-uniffle/issues/1249#issuecomment-1772566879

   
   <img width="601" alt="image" 
src="https://github.com/apache/incubator-uniffle/assets/10381583/caa17b0c-a2b4-4720-8171-9542e30b1fba";>
   
   
   Upper picture show the data format change. In brief, we have three data 
format:
   Format B: the raw format. It is a sequence of keylen, valuelen, key, value, 
ending with two -1.
   Format A: Format b is compressed according to uniffle encoding.
   Format C: Add checksum to format b (IFile format) and compress it according 
to hadoop encoding.
   
   > The yellow is component of Map. Blue is shuffle server. Green is component 
of Reduce.
   
   What's the key of the promblem which is described by 
8683254720974c7254f9c5c2fd902743ae0ab273?
   We write the format B to OnDiskMapOutput, so MergeManagerImpl can not parse 
it. 
   


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