96a7ed7efb
This is the second half of the fix for issue #13968. The first half is already merged with PR #18346 Scylla issues warnings for partitions containing more rows than a configured threshold. The warning is issued by inserting a row into the `system.large_partitions` table. This row contains the information about the partition for which the warning is issued: keyspace, table, sstable, partition key and size, compaction time and the number of rows in the partition. A previous PR #18346 also added range tombstone count to this row. This change adds a new counter for dead rows to the large_partitions table. This change also adds cluster feature protection for writing into these new counters. This is needed in case a cluster is in the process of being upgraded to this new version, after which an upgraded node writes data with the new schema into `system.large_partitions`, and finally a node is then rolled back to an old version. This node will then revert the schema to the old version, but the written sstables will still contain data with the new counters, causing any readers of this table to throw errors when they encounter these cells. This is an enhancement, and backporting is not needed. Fixes #13968 Closes scylladb/scylladb#18458 * github.com:scylladb/scylladb: sstable: added test for counting dead rows sstable: added docs for system.large_partitions.dead_rows sstable: added cluster feature for dead rows and range tombstones sstable: write dead_rows count to system.large_partitions sstable: added counter for dead rows
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.