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fe7e63f109
This patch series: - Increases the number of allowed scheduling groups to allow creation of `sl:driver` - Implements `create_driver_service_level` that creates `sl:driver` with shares=200 if it wasn't already created - Implements creation of `sl:driver` for new systems and tests in `raft_initialize_discovery_leader` - Modifies `topology_coordinator` to use create `sl:driver` after upgrades. - Implements using `sl:driver` for new connections in `transport/server` - Adds to `transport/server` recognition of driver's control connections and forcing them to keep using `sl:driver`. - Adds tests to verify the new functionality - Modifies existing tests to let them pass after `sl:driver` is added - Modifies the documentation to contain new `sl:driver` The changes were evaluated by a test with the following scenario ([test_connections-sl-driver.py](https://github.com/user-attachments/files/22021273/test_connections-sl-driver.py)): - Start ScyllaDB with one node - Create 1000 keyspaces, 1 table in each keyspace - Start `cassandra-stress` (`-rate threads=50 -mode native cql3`) - Run connection storm with 1000 session (100 python processes, 10 sessions each) The maximum latency during connection storm dropped **from 224.94ms to 41.43ms** (those numbers are average from 20 test executions, were max latency was in [140ms, 361ms] before change and [31.4ms, 61.5ms] after). The snippet of cassandra-stress output from the moment of connection storm: Before: ``` type total ops, op/s, pk/s, row/s, mean, med, .95, .99, .999, max, time, stderr, errors, gc: #, max ms, sum ms, sdv ms, mb ... total, 789206, 85887, 85887, 85887, 0.6, 0.3, 2.0, 2.0, 2.5, 5.0, 9.0, 0.09679, 0, 0, 0, 0, 0, 0 total, 909322, 120116, 120116, 120116, 0.4, 0.2, 1.9, 2.0, 2.1, 3.1, 10.0, 0.09053, 0, 0, 0, 0, 0, 0 total, 964392, 55070, 55070, 55070, 0.9, 0.4, 2.0, 4.5, 7.7, 18.9, 11.0, 0.09203, 0, 0, 0, 0, 0, 0 total, 975705, 11313, 11313, 11313, 4.4, 3.5, 6.5, 24.5, 82.7, 83.0, 12.0, 0.11713, 0, 0, 0, 0, 0, 0 total, 987548, 11843, 11843, 11843, 4.2, 3.5, 6.5, 33.7, 48.6, 51.5, 13.0, 0.13366, 0, 0, 0, 0, 0, 0 total, 995422, 7874, 7874, 7874, 6.3, 4.0, 7.7, 85.6, 112.9, 113.5, 14.0, 0.14753, 0, 0, 0, 0, 0, 0 total, 1007228, 11806, 11806, 11806, 4.3, 3.5, 6.5, 29.1, 43.8, 87.1, 15.0, 0.15598, 0, 0, 0, 0, 0, 0 total, 1012840, 5612, 5612, 5612, 8.2, 5.0, 11.5, 121.8, 166.6, 170.1, 16.0, 0.16535, 0, 0, 0, 0, 0, 0 total, 1016186, 3346, 3346, 3346, 13.4, 7.4, 20.1, 204.9, 207.6, 210.4, 17.0, 0.17405, 0, 0, 0, 0, 0, 0 total, 1025462, 9276, 9276, 9276, 6.3, 3.9, 9.6, 74.6, 206.8, 210.0, 18.0, 0.17800, 0, 0, 0, 0, 0, 0 total, 1035979, 10517, 10517, 10517, 4.8, 3.5, 6.7, 38.5, 82.6, 83.0, 19.0, 0.18120, 0, 0, 0, 0, 0, 0 total, 1047488, 11509, 11509, 11509, 4.3, 3.5, 6.0, 32.6, 72.3, 74.0, 20.0, 0.18334, 0, 0, 0, 0, 0, 0 total, 1077456, 29968, 29968, 29968, 1.7, 1.6, 2.9, 3.6, 7.0, 8.2, 21.0, 0.17943, 0, 0, 0, 0, 0, 0 total, 1105490, 28034, 28034, 28034, 1.8, 1.8, 3.5, 4.6, 5.3, 13.8, 22.0, 0.17609, 0, 0, 0, 0, 0, 0 total, 1132221, 26731, 26731, 26731, 1.9, 1.8, 3.8, 5.2, 8.4, 11.1, 23.0, 0.17314, 0, 0, 0, 0, 0, 0 total, 1162149, 29928, 29928, 29928, 1.7, 1.7, 3.0, 4.5, 8.0, 9.1, 24.0, 0.16950, 0, 0, 0, 0, 0, 0 ... ``` After: ``` type total ops, op/s, pk/s, row/s, mean, med, .95, .99, .999, max, time, stderr, errors, gc: #, max ms, sum ms, sdv ms, mb ... total, 822863, 94379, 94379, 94379, 0.5, 0.3, 2.0, 2.0, 2.1, 3.7, 9.0, 0.06669, 0, 0, 0, 0, 0, 0 total, 937337, 114474, 114474, 114474, 0.4, 0.2, 2.0, 2.0, 2.1, 3.4, 10.0, 0.06301, 0, 0, 0, 0, 0, 0 total, 986630, 49293, 49293, 49293, 1.0, 1.0, 2.0, 2.1, 17.9, 19.0, 11.0, 0.07318, 0, 0, 0, 0, 0, 0 total, 1026734, 40104, 40104, 40104, 1.2, 1.0, 2.0, 2.2, 6.3, 7.1, 12.0, 0.08410, 0, 0, 0, 0, 0, 0 total, 1066124, 39390, 39390, 39390, 1.3, 1.0, 2.0, 2.2, 2.6, 3.4, 13.0, 0.09108, 0, 0, 0, 0, 0, 0 total, 1103082, 36958, 36958, 36958, 1.3, 1.1, 2.1, 2.5, 3.1, 4.2, 14.0, 0.09643, 0, 0, 0, 0, 0, 0 total, 1141987, 38905, 38905, 38905, 1.3, 1.0, 2.0, 2.4, 11.4, 12.7, 15.0, 0.09894, 0, 0, 0, 0, 0, 0 total, 1180023, 38036, 38036, 38036, 1.3, 1.0, 2.0, 3.7, 5.6, 7.1, 16.0, 0.10070, 0, 0, 0, 0, 0, 0 total, 1216481, 36458, 36458, 36458, 1.4, 1.0, 2.1, 3.6, 4.7, 5.0, 17.0, 0.10210, 0, 0, 0, 0, 0, 0 total, 1256819, 40338, 40338, 40338, 1.2, 1.0, 2.0, 2.2, 3.5, 5.4, 18.0, 0.10173, 0, 0, 0, 0, 0, 0 total, 1295122, 38303, 38303, 38303, 1.3, 1.0, 2.0, 2.4, 21.0, 21.1, 19.0, 0.10136, 0, 0, 0, 0, 0, 0 total, 1334743, 39621, 39621, 39621, 1.3, 1.0, 2.0, 2.3, 3.3, 4.0, 20.0, 0.10055, 0, 0, 0, 0, 0, 0 total, 1375579, 40836, 40836, 40836, 1.2, 1.0, 2.0, 2.1, 3.4, 5.7, 21.0, 0.09927, 0, 0, 0, 0, 0, 0 total, 1415576, 39997, 39997, 39997, 1.2, 1.0, 2.0, 2.3, 3.2, 4.1, 22.0, 0.09807, 0, 0, 0, 0, 0, 0 total, 1449268, 33692, 33692, 33692, 1.5, 1.4, 2.5, 3.2, 4.2, 5.6, 23.0, 0.09800, 0, 0, 0, 0, 0, 0 total, 1471873, 22605, 22605, 22605, 2.2, 2.0, 4.8, 5.9, 7.0, 7.9, 24.0, 0.10015, 0, 0, 0, 0, 0, 0 ... ``` Fixes: https://github.com/scylladb/scylladb/issues/24411 This is a new feature, so no backport needed. Closes scylladb/scylladb#25412 * github.com:scylladb/scylladb: docs: workload-prioritization: add driver service level test: add test to verify use of `sl:driver` transport: use `sl:driver` to handle driver's control connections transport: whitespace only change in update_scheduling_group transport: call update_scheduling_group for non-auth connections generic_server: transport: start using `sl:driver` for new connections test: add test_desc_* for driver service level test: service_levels: add tests for sl:driver creation and removal test: add reload_raft_topology_state() to ScyllaRESTAPIClient service_level_controller: automatically create `sl:driver` service_level_controller: methods to create driver service level service_level_controller: handle special sl:driver in DESC output topology_coordinator: add service_level_controller reference system_keyspace: add service_level_driver_created test: add MAX_USER_SERVICE_LEVELS
ScyllaDB Documentation
This repository contains the source files for ScyllaDB documentation.
- The
devfolder contains developer-oriented documentation related to the ScyllaDB code base. It is not published and is only available via GitHub. - All other folders and files contain user-oriented documentation related to ScyllaDB and are sources for docs.scylladb.com/manual.
To report a documentation bug or suggest an improvement, open an issue in GitHub issues for this project.
To contribute to the documentation, open a GitHub pull request.
Key Guidelines for Contributors
- The user documentation is written in reStructuredText (RST) - a plaintext markup language similar to Markdown. If you're not familiar with RST, see ScyllaDB RST Examples.
- The developer documentation is written in Markdown. See Basic Markdown Syntax for reference.
- Follow the ScyllaDB Style Guide.
To prevent the build from failing:
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If you add a new file, ensure it's added to an appropriate toctree, for example:
.. toctree:: :maxdepth: 2 :hidden: Page X </folder1/article1> Page Y </folder1/article2> Your New Page </folder1/your-new-article> -
Make sure the link syntax is correct. See the guidelines on creating links
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Make sure the section headings are correct. See the guidelines on creating headings Note that the markup must be at least as long as the text in the heading. For example:
---------------------- Prerequisites ----------------------
Building User Documentation
Prerequisites
- Python
- poetry
- make
See the ScyllaDB Sphinx Theme prerequisites to check which versions of the above are currently required.
Mac OS X
You must have a working Homebrew in order to install the needed tools.
You also need the standard utility make.
Check if you have these two items with the following commands:
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make -h
Linux Distributions
Building the user docs should work out of the box on most Linux distributions.
Windows
Use "Bash on Ubuntu on Windows" for the same tools and capabilities as on Linux distributions.
Building the Docs
- Run
make previewto build the documentation. - Preview the built documentation locally at http://127.0.0.1:5500/.
Cleanup
You can clean up all the build products and auto-installed Python stuff with:
make pristine
Information for Contributors
If you are interested in contributing to Scylla docs, please read the Scylla open source page at http://www.scylladb.com/opensource/ and complete a Scylla contributor agreement if needed. We can only accept documentation pull requests if we have a contributor agreement on file for you.
Third-party Documentation
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Do any copying as a separate commit. Always commit an unmodified version first and then do any editing in a separate commit.
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We already have a copy of the Apache license in our tree, so you do not need to commit a copy of the license.
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Include the copyright header from the source file in the edited version. If you are copying an Apache Cassandra document with no copyright header, use:
This document includes material from Apache Cassandra.
Apache Cassandra is Copyright 2009-2014 The Apache Software Foundation.