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9e0741e5b7
add a segment sequence number that is a global (per-shard) increasing number that is allocated when getting a new segment for write, and is written in buffer headers in the segment. this is useful when scanning a segment for ignoring buffers that belong to an older generation of that segment. it's also useful by creating a single ordering of all segments that respects the compaction ordering. on recovery, we keep the records from the newest segments among equal records. so if a record is rewritten by compaction, the recovery will choose the records from the new compacted segments. discard segments by writing zeroes to the segment header.
Scylla developer documentation
This folder contains developer-oriented documentation concerning the ScyllaDB codebase. We also have a wiki, which contains additional developer-oriented documentation. There is currently no clear definition of what goes where, so when looking for something be sure to check both.
Seastar documentation can be found here.
User documentation can be found on docs.scylladb.com
For information on how to build Scylla and how to contribute visit HACKING.md and CONTRIBUTING.md.