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Distribute the voters evenly across racks in the datacenters. When distributing the voters across datacenters, the datacenters with more racks will be preferred in case of a tie. Also, in case of asymmetric voter distribution (2 DCs), the DC with more racks will have more voters (if the node counts allow it). In case of a single datacenter, the voters will be distributed across racks evenly (in the similar manner as done for the whole datacenters). The intention is that similar to losing a datacenter, we want to avoid losing the majority if a rack goes down - so if there are multiple racks, we want to distribute the voters across them in such a way that losing the whole rack will not cause the majority loss (if possible).
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.