d9b8278178
During an ALTER KEYSPACE statement execution where a table with a view is present, we need to perform tablet migrations for both tables. These migrations are not synchronized, so at some point the base may have a different number of non-pending replicas than the view. Because of that, we can't pair them correctly. If there is more non-pending base replicas than view replicas, we don't need to do anything because the view replica that didn't finish migrating is a pending replica and will get view updates from all base replicas. But if there is more non-pending view replicas than base replicas, we may currently lose view updates to the new view replica. This patch adds a workaround for this scenario. If after one migration we have too more non-pending view replicas than base replicas, we add it to the pending replica list so that it gets an update anyway. This patch will also take effect if the base and view replica counts differ due to some other bug. To track that, a new metric is added to count such occurrences. This patch also includes a test for this exact scenario, which is enforced by an injection. Fixes https://github.com/scylladb/scylladb/issues/21492
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.