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ClickHouse® is a real-time analytics DBMS
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MemoryTracker starts accounting memory directly only after per-thread allocation exceeded max_untracker_memory (or memory_profiler_step). But even memory under this limit should be accounted too, and there is code to do this in ThreadStatus dtor, however due to PullingAsyncPipelineExecutor detached the query from thread group that memory was not accounted. So remove CurrentThread::detachQueryIfNotDetached() from threads that uses ThreadFromGlobalPool since it has ThreadStatus, and the query will be detached using CurrentThread::defaultThreadDeleter. Note, that before this patch memory accounting works for HTTP queries due to it had been accounted from ParallelFormattingOutputFormat, but not for TCP. 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.
- 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.