Avi Kivity 66173c06a3 Merge 'Eradicate the ability to create new sstables with numerical sstable generation' from Benny Halevy ...

Remove support for generating numerical sstable generation for new sstables.
Loading such sstables is still supported but new sstables are always created with a uuid generation.
This is possible since:
* All live versions (since 5.4 / f014ccf369) now support uuid sstable generations.
* The `uuid_sstable_identifiers_enabled` config option (that is unused from version 2025.2 / 6da758d74c) controls only the use of uuid generations when creating new sstables. SSTables with uuid generations should still be properly loaded by older versions, even if `uuid_sstable_identifiers_enabled` is set to `false`.

Fixes #24248

* Enhancement, no backport needed

Closes scylladb/scylladb#24512

* github.com:scylladb/scylladb:
  streaming: stream_blob: use the table sstable_generation_generator
  replica: distributed_loader: process_upload_dir: use the table sstable_generation_generator
  sstables: sstable_generation_generator: stop tracking highest generation
  replica: table: get rid of update_sstables_known_generation
  sstables: sstable_directory: stop tracking highest_generation
  replica: distributed_loader: stop tracking highest_generation
  sstables: sstable_generation: get rid of uuid_identifiers bool class
  sstables_manager: drop uuid_sstable_identifiers
  feature_service: move UUID_SSTABLE_IDENTIFIERS to supported_feature_set
  test: cql_query_test: add test_sstable_load_mixed_generation_type
  test: sstable_datafile_test: move copy_directory helper to test/lib/test_utils
  test: database_test: move table_dir helper to test/lib/test_utils

2025-08-14 11:54:33 +03:00

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