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ClickHouse® is a real-time analytics DBMS
8556929f50
I've noticed this in one of production setups, where lots of queries are
executed with distributed_group_by_no_merge=2 (automatically vai
optimize_skip_unused_shards optimization) and
optimize_aggregation_in_order=1, with this two settings initiator may
not read from some shards (i.e. X) for quite long period of time,
because it reads from other shards (i.e. Y) and it does not need
any data from X yet (due to it read everything in order), and this will
lead to query timeout, so timeouts had been increased.
Previously both timeouts had been tuned, but this leads to connection
hungs in case of abnormal machine reboots. So it is better to tune only
send_timeout (and this should be enough, since the only problem is the
sender) and this will allow to see that the connection is broken on the
initiator once it will read from this shard.
but after changing only send_timeout, the query still timedout, and the
reason is this place, which swaps this timeouts.
It had been introduced in
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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 (github.dev) with syntax highlighting, powered by github.dev.
- Static Analysis (SonarCloud) proposes C++ quality improvements.
- Contacts can help to get your questions answered if there are any.
Upcoming Events
- v23.9 Community Call - Sep 28 - 23.9 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 Amsterdam - Oct 31
- ClickHouse Meetup in Beijing - Nov 4
- ClickHouse Meetup in San Francisco - Nov 8
- ClickHouse Meetup in Singapore - Nov 15
- ClickHouse Meetup in Berlin - Nov 30
- ClickHouse Meetup in NYC - Dec 11
- ClickHouse Meetup in Boston - Dec 12
Also, keep an eye out for upcoming meetups around the world. 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: v23.6 Release Webinar All the features of 23.6, one convenient video! 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 and 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!