Native serialization for DynamicIVF index#296
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This PR adds native stream serialization to all SVS index types, as an alternative to the existing (legacy) directory-based serialization. It allow to avoid filesystem round-trips of the data. The native serialization doesn't require from the stream to be seek able, so no additional restrictions were introduced. See the following PR for details: #280, #281, #285, #286, #289, #292, #294, #296, #299 Main changes are: 1. A CRTP base `Archiver` extracts binary I/O primitives (`write_size`, `read_size`, `write_name`, `read_name`, `read_from_istream`) from `DirectoryArchiver`. `DirectoryArchiver` and new `StreamArchiver` class inherit from `Archiver`. `StreamArchiver` has its own magic number ("SVS_STRM") to distinguish native streams from directory archives. 2. The monolithic `Writer` is split via CRTP with two derived classes: `FileWriter` owns an `std::ofstream`, writes a header, flushes on destructor, `StreamWriter` wraps an external `std::ostream&`, no header/lifecycle management. This allows `io::save(data, os)` to write vector data directly to any stream. 3. The `save(stream)` in orchestrator `Impl` classes no longer does temp-dir->pack. Instead it directly calls `impl().save(stream)`. 4. The dispatching between new (native) and old (legacy) deserialization is made at the orchestrators. `Deserializer::build(is)` reads the magic number, exposes `is_native()` to choose path. --------- Co-authored-by: Dmitry Razdoburdin <drazdobu@intel.com> Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com> Co-authored-by: Rafik Saliev <rafik.f.saliev@intel.com> Co-authored-by: ethanglaser <42726565+ethanglaser@users.noreply.github.com>
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This PR introduce native serialization for DynamicIVF index.
Main changes are:
svs::index::ivf::load_dynamic_ivf_index accptingistream is introduced.