Uncompressed SSTables store their checksums in a separate CRC.db file.
Add this in the list of SSTable components.
Since this component is used only for validation, load the component
on-demand for validation tasks and delete it when all validation tasks
finish. In more detail:
- Make the checksum component shareable and weakly referencable.
Also, add a constructor since it is no longer an aggregate.
- Use a weak pointer to store a non-owning reference in the components
and a shared pointer to keep the object alive while validation runs.
Once validation finishes, the component should be cleaned up
automatically.
Signed-off-by: Nikos Dragazis <nikolaos.dragazis@scylladb.com>
Instead of lengthy blurbs, switch to single-line, machine-readable
standardized (https://spdx.dev) license identifiers. The Linux kernel
switched long ago, so there is strong precedent.
Three cases are handled: AGPL-only, Apache-only, and dual licensed.
For the latter case, I chose (AGPL-3.0-or-later and Apache-2.0),
reasoning that our changes are extensive enough to apply our license.
The changes we applied mechanically with a script, except to
licenses/README.md.
Closes#9937
