564cebd0e6
The guard should stop refreshing the ERM when the number of tablets changes. Tablet splits or merges invalidate the `tablet_id` field (`_tablet`), which means the guard can no longer correctly protect ongoing operations from tablet migrations. The problem is specific to LWT, since `tablet_metadata_guard` is used mostly for heavy topology operations, which exclude with split and merge. The guard was used for LWT as an optimization -- we don't need to block topology operations or migrations of unrelated tablets. In the future, we could use the guard for regular reads/writes as well (via the `token_metadata_guard` wrapper). Fixes [scylladb/scylladb#26437](https://github.com/scylladb/scylladb/issues/26437) backports: need to backport to 2025.4 since the bug is relevant to LWT over tablets. Closes scylladb/scylladb#26619 * github.com:scylladb/scylladb: test_tablets_lwt: add test_tablets_merge_waits_for_lwt test.py: add universalasync_typed_wrap tablet_metadata_guard: fix split/merge handling tablet_metadata_guard: add debug logs paxos_state: shards_for_writes: improve the error message storage_service: barrier_and_drain – change log level to info topology_coordinator: fix log message
Scylla in-source tests.
For details on how to run the tests, see docs/dev/testing.md
Shared C++ utils, libraries are in lib/, for Python - pylib/
alternator - Python tests which connect to a single server and use the DynamoDB API unit, boost, raft - unit tests in C++ cqlpy - Python tests which connect to a single server and use CQL topology* - tests that set up clusters and add/remove nodes cql - approval tests that use CQL and pre-recorded output rest_api - tests for Scylla REST API Port 9000 scylla-gdb - tests for scylla-gdb.py helper script nodetool - tests for C++ implementation of nodetool
If you can use an existing folder, consider adding your test to it. New folders should be used for new large categories/subsystems, or when the test environment is significantly different from some existing suite, e.g. you plan to start scylladb with different configuration, and you intend to add many tests and would like them to reuse an existing Scylla cluster (clusters can be reused for tests within the same folder).
To add a new folder, create a new directory, and then
copy & edit its suite.ini.