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New segment format #444

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New segment format #444

wants to merge 3 commits into from

Commits on Jun 26, 2023

  1. uv_segment: Introduce a new disk format for segments. 

    The (open) segments now contain the first index of the encoded log
entries and a checksum over the format and first index fields.

The 24 byte header looks like:
  _________________________________________
 |[0 - 7] |      [8-15] | [16-19] | [20-23]|
 |FORMAT  | FIRST_INDEX |     CRC |  UNUSED|
 |________|_____________|_________|________|

This allows us to no longer guess the start index and do more
direct checks. This also allows removing the barrier when taking a
snapshot.
    Mathieu Borderé committed Jun 26, 2023
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  2. segment: Add recovery binary for downgrading segments. 

    Downgrades all segments in a directory from version 2 to version 1.
Use in case one has to downgrade dqlite versions.
    Mathieu Borderé committed Jun 26, 2023
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  3. wiprecoverytests

    Mathieu Borderé committed Jun 26, 2023
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