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snapshot restore-from-archive streaming and filtering (#13658)
Stream snapshot to FSM when restoring from archive The `RestoreFromArchive` helper decompresses the snapshot archive to a temporary file before reading it into the FSM. For large snapshots this performs a lot of disk IO. Stream decompress the snapshot as we read it, without first writing to a temporary file. Add bexpr filters to the `RestoreFromArchive` helper. The operator can pass these as `-filter` arguments to `nomad operator snapshot state` (and other commands in the future) to include only desired data when reading the snapshot.
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```release-note:improvement | ||
cli: `operator snapshot state` supports `-filter` expressions and avoids writing large temporary files | ||
``` |
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