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We want to exclude repair with tablet migrations to avoid races between repair reads and writes with replica movement. Repair is not prepared to handle topology transitions in the middle. One reason why it's not safe is that repair may successfully write to a leaving replica post streaming phase and consider all replicas to be repaired, but in fact they are not, the new replica would not be repaired. Other kinds of races could result in repair failures. If repair writes to a leaving replica which was already cleaned up, such writes will fail, causing repair to fail. Excluding works by keeping effective_replication_map_ptr in a version which doesn't have table's tablets in transitions. That prevents later transitions from starting because topology coordinator's barrier will wait for that erm before moving to a stage later than allow_write_both_read_old, so before any requets start using the new topology. Also, if transitions are already running, repair waits for them to finish. Fixes #17658. Fixes #18561.
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.