ddb1181103
When `force_capacity_based_balancing` is enabled and a node is being drained/excluded, the tablet allocator incorrectly aborts balancing due to incomplete tablet stats - even though capacity-based balancing doesn't depend on tablet sizes. The tablet allocator normally waits for complete load stats before balancing. An exception exists for drained+excluded nodes (they're unreachable and won't return stats). However, when forced capacity-based balancing is active, this exception was not being applied, causing the balancer to reject the drain plan. Adjust the condition in `tablet_allocator.cc` so that the "ignore missing data for drained nodes" logic applies regardless of whether capacity-based balancing is forced. Added a Boost unit test that forces capacity-based balancing and verifies a drained/excluded node gets its tablets migrated even when tablet size stats are missing. This bug was introduced in 2026.1, so this needs to be backported to 2026.1 and 2026.2 Fixes: SCYLLADB-1803 Closes scylladb/scylladb#29791 * github.com:scylladb/scylladb: test: boost: add drain test for forced capacity-based balancing service: allow draining with forced capacity-based balancing
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.