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ClickHouse® is a real-time analytics DBMS
20dbf5eb34
In case of possible EINTR (i.e. query profiler) it is possible for
select() from getReplicaForReading() (this is the stage when the
initiator is waiting for Cancel packet from the remote shards, that can
be sent in case of enough rows was read, or the query had been cancelled
explicitly) to return without any sockets ready, and
getReplicaForReading() will assume that the timeout happened.
Here is a stacktrace example:
[ 59205 ] {04f3d3a4-7346-4ef2-bf57-928f9e55ed89} <Error> TCPHandler: Code: 159. DB::Exception: Received from b8:9000. DB::Exception: Timeout (-1000 ms) exceeded while reading from . Stack trace:
0. Poco::Exception::Exception() @ 0x17e26eac in /usr/bin/clickhouse
1. DB::Exception::Exception() @ 0xb550b9a in /usr/bin/clickhouse
2. DB::Exception::Exception<>() @ 0x15ad1c81 in /usr/bin/clickhouse
3. DB::MultiplexedConnections::getReplicaForReading(bool) @ 0x15ad16fc in /usr/bin/clickhouse
4. DB::MultiplexedConnections::receivePacketUnlocked() @ 0x15ad02fd in /usr/bin/clickhouse
5. DB::MultiplexedConnections::drain() @ 0x15ad0df8 in /usr/bin/clickhouse
6. DB::ConnectionCollector::drainConnections(DB::IConnections&, bool) @ 0x1443c205 in /usr/bin/clickhouse
7. DB::RemoteQueryExecutor::finish() @ 0x1445ea6a in /usr/bin/clickhouse
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.
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
- v22.9 Release Webinar Original creator, co-founder, and CTO of ClickHouse Alexey Milovidov will walk us through the highlights of the release, provide live demos, and share vision into what is coming in the roadmap.
- ClickHouse for Analytics @ Barracuda Networks Join us for this in person meetup hosted by our friends at Barracuda in Bay Area.