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To fix a race between split and repair herec1de4859d8, a new sstable generated during streaming can be split before being attached to the sstable set. That's to prevent an unsplit sstable from reaching the set after the tablet map is resized. So we can think this split is an extension of the sstable writer. A failure during split means the new sstable won't be added. Also, the duration of split is also adding to the time erm is held. For example, repair writer will only release its erm once the split sstable is added into the set. This single-sstable split is going through run_custom_job(), which serializes with other maintenance tasks. That was a terrible decision, since the split may have to wait for ongoing maintenance task to finish, which means holding erm for longer. Additionally, if split monitor decides to run split on the entire compaction group, it can cause single-sstable split to be aborted since the former wants to select all sstables, propagating a failure to the streaming writer. That results in new sstable being leaked and may cause problems on restart, since the underlying tablet may have moved elsewhere or multiple splits may have happened. We have some fragility today in cleaning up leaked sstables on streaming failure, but this single-sstable split made it worse since the failure can happen during normal operation, when there's e.g. no I/O error. It makes sense to kill run_custom_job() usage, since the single-sstable split is offline and an extension of sstable writing, therefore it makes no sense to serialize with maintenance tasks. It must also inherit the sched group of the process writing the new sstable. The inheritance happens today, but is fragile. Fixes #20626. (cherry picked from commit999f1f1318) (cherry picked from commit38ce2c605d) Refs #20737 Closes scylladb/scylladb#20802 * github.com:scylladb/scylladb: tablet: Fix single-sstable split when attaching new unsplit sstables replica: Fix tablet split execute after restart
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.