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22949bae52
implement tablet split, tablet merge and tablet migration for tables that use the experimental logstor storage engine. * tablet merge simply merges the histograms of segments of one compaction group with another. * for tablet split we take the segments from the source compaction group, read them and write all live records to separate segments according to the split classifier, and move separated segments to the target compaction groups. * for tablet migration we use stream_blob, similarly to file streaming of sstables. we add a new op type for streaming a logstor segment. on the source we take a snapshot of the segments with an input stream that reads the segment, and on the target we create a sink that allocates a new segment on the target shard and writes to it. * we also do some improvements for recovery and loading of segments. we add a segment header that contains useful information for non-mixed segments, such as the table and token range. Refs SCYLLADB-770 no backport - still a new and experimental feature Closes scylladb/scylladb#29207 * github.com:scylladb/scylladb: test: logstor: additional logstor tests docs/dev: add logstor on-disk format section logstor: add version and crc to buffer header test: logstor: tablet split/merge and migration logstor: enable tablet balancing logstor: streaming of logstor segments using stream_blob logstor: add take_logstor_snapshot logstor: segment input/output stream logstor: implement compaction_group::cleanup logstor: tablet split logstor: tablet merge logstor: add compaction reenabler logstor: add segment header logstor: serialize writes to active segment replica: extend compaction_group functions for logstor replica: add compaction_group_for_logstor_segment logstor: code cleanup
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.