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when loading CDC streams metadata for tablets from the tables, read only new entries from the history table instead of reading all entries. This improves the CDC metadata reloading, making it more efficient and predictable. the CDC metadata is loaded as part of group0 reload whenever the internal CDC tables are modified. on tablet split / merge, we create a new CDC timestamp and streams by writing them to the cdc_streams_history table by group0 operation, and when it's applied we reload the in-memory CDC streams map by reading from the tables and constructing the updated map. Previously, on every update, we would read the entire cdc_streams_history entries for the changed table, constructing all its streams and creating a new map from scratch. We improve this now by reading only new entries from cdc_streams_history and append them to the existing map. we can do this because we only append new entries to cdc_streams_history with higher timestamp than all previous entries. This makes this reloading more efficient and predictable, because previously we would read a number of entries that depends on the number of tablets splits and merges, which increases over time and is unbounded, whereas now we read only a single stream set on each update. Fixes https://github.com/scylladb/scylladb/issues/26732 backport to 2025.4 where cdc with tablets is introduced Closes scylladb/scylladb#26160 * github.com:scylladb/scylladb: test: cdc: extend cdc with tablets tests cdc: improve cdc metadata loading
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.