b608490885
LocalWriteThrottlerSleepMicroseconds is too unpredictable in debug builds, event with 50% of allowed error it still fails [1]. [1]: https://s3.amazonaws.com/clickhouse-test-reports/51006/6cc4f76707b196b0f02938671f62c9bb3d267faa/stateless_tests__debug__%5B2_5%5D.html Looking into query_log artifacts: $ clickhouse-local --file query_log.tsv.zst --input-format TSVWithNamesAndTypes -q "select query_duration_ms, ProfileEvents['LocalWriteThrottlerSleepMicroseconds'] from table where log_comment = '02703_max_local_write_bandwidth.sh' and type != 'QueryStart' and query_id = 'eebxgbfqyt'" --output-format Vertical Row 1: ────── query_duration_ms: 15'608 arrayElement(ProfileEvents, 'LocalWriteThrottlerSleepMicroseconds'): 1'385'203 So query duration is 15.6sec, while throttle sleeps only 1.39sec, which is only 9%, apparently it waits somewhere else. Signed-off-by: Azat Khuzhin <a.khuzhin@semrush.com> |
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ClickHouse® is an open-source column-oriented database management system that allows generating analytical data reports in real-time.
How To Install (Linux, macOS, FreeBSD)
curl https://clickhouse.com/ | sh
Useful Links
- Official website has a quick high-level overview of ClickHouse on the main page.
- ClickHouse Cloud ClickHouse as a service, built by the creators and maintainers.
- Tutorial shows how to set up and query a small ClickHouse cluster.
- Documentation provides more in-depth information.
- YouTube channel has a lot of content about ClickHouse in video format.
- Slack and Telegram allow chatting with ClickHouse users in real-time.
- Blog contains various ClickHouse-related articles, as well as announcements and reports about events.
- Code Browser (Woboq) with syntax highlight and navigation.
- Code Browser (github.dev) with syntax highlight, powered by github.dev.
- Contacts can help to get your questions answered if there are any.
Upcoming Events
- v23.5 Release Webinar - Jun 8 - 23.5 is rapidly approaching. Original creator, co-founder, and CTO of ClickHouse Alexey Milovidov will walk us through the highlights of the release.
- ClickHouse Meetup in Bangalore - Jun 7
- ClickHouse Meetup in San Francisco - Jun 7
Also, keep an eye out for upcoming meetups in Amsterdam, Boston, NYC, Beijing, and Toronto. Somewhere else you want us to be? Please feel free to reach out to tyler clickhouse com.
Recent Recordings
- Recent Meetup Videos: Meetup Playlist Whenever possible recordings of the ClickHouse Community Meetups are edited and presented as individual talks. Current featuring "Modern SQL in 2023", "Fast, Concurrent, and Consistent Asynchronous INSERTS in ClickHouse", and "Full-Text Indices: Design and Experiments"
- Recording available: v23.4 Release Webinar Faster Parquet Reading, Asynchonous Connections to Reoplicas, Trailing Comma before FROM, extractKeyValuePairs, integrations updates, and so much more! Watch it now!
- All release webinar recordings: YouTube playlist
Interested in joining ClickHouse and making it your full time job?
We are a globally diverse and distributed team, united behind a common goal of creating industry-leading, real-time analytics. Here, you will have an opportunity to solve some of the most cutting edge technical challenges and have direct ownership of your work and vision. If you are a contributor by nature, a thinker as well as a doer - we’ll definitely click!
Check out our current openings here: https://clickhouse.com/company/careers
Cant find what you are looking for, but want to let us know you are interested in joining ClickHouse? Email careers@clickhouse.com!