Design doc: Zstd re-compression for CDT cache entries

[Himanshu Panwar]

  Hi net-dev,                                                                                                           

                                         

  I'm working on adding zstd compression for Compression Dictionary Transport (CDT) cache entries in the HTTP cache     

  (https://issues.chromium.org/u/0/issues/380957720).

                                                                                                                        

  CDT enables delta-compressed HTTP responses using shared dictionaries, but the disk cache currently stores the fully  

  decompressed body. This means cache entries are significantly larger than the original on-the-wire response. The

  proposal is to re-compress these bodies with zstd level 1 before writing to disk, and transparently decompress on     

  cache reads.                           

  Design doc: https://docs.google.com/document/d/1UMHyHuZmjpP_ZVeuZ68mzFK1C-YCq35EM5SXBVoPHdI/edit?tab=t.0                                                                                                                                                   

                                                                                                                        

  Would appreciate any feedback on the approach, particularly around the threading model and the state machine     

  integration points.                                                                                              

                                         

  Thanks,                                                                                                               

  Himanshu

[Adam Rice]

Sorry for the delayed response. This is good work. I made a couple of comments, nothing major.

Thanks,

Adam

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