4dfb7e3051
The group0 state machine calls `merge_topology_snapshot` from `transfer_snapshot`. It feeds it with `raft_topology_snapshot` returned from `raft_pull_topology_snapshot`. This snapshot includes the entire `system.cdc_generations_v3` table. It can be huge and break the commitlog `max_record_size` limit. The `system.cdc_generations_v3` is a single-partition table, so all the data is contained in one mutation object. To fit the commitlog limit we split this mutation into many smaller ones and apply them in separate `database::apply` calls. That means we give up the atomicity guarantee, but we actually don't need it for `system.cdc_generations_v3` and `system.topology_requests`. This PR fixes the dtest `update_cluster_layout_tests.py::TestLargeScaleCluster::test_add_many_nodes_under_load` Fixes scylladb/scylladb#17545 Closes scylladb/scylladb#17632 * github.com:scylladb/scylladb: test_cdc_generation_data: test snapshot transfer storage_service::merge_topology_snapshot: handle big cdc_generations_v3 mutations mutation: add split_mutation function storage_service::merge_topology_snapshot: fix indentation
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++ cql-pytest - 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.