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overlap: use overlapcache #3639

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overlap: use overlapcache #3639

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Commits on May 30, 2024

  1. overlap: add overlapcache subpackage 

    This commit implements a new overlap cache data structure which will
be embedded into `FileMetadata`.

The cache works by remembering a handful of data regions and whether
the spaces in-between are known to be empty. The goal is to make
repeated overlap checks in the same area of a file much cheaper. This
will make it feasible to have an optimistic overlap check that can be
repeated on a slightly changed version without redoing most of the
work.
    @RaduBerinde
    RaduBerinde committed May 30, 2024
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  2. overlap: use overlapcache 

    We embed an overlap cache in `FileMetadata` and use it with the
overlap checker.

When we have to open a table, we now try to find a maximal empty
region and the two surrounding data regions so that we can populate
the cache with this information.

The cache will be very useful for optimistic overlap checks which
happen without blocking compactions, and might need to be retried.
    @RaduBerinde
    RaduBerinde committed May 30, 2024
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