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ClickHouse® is a real-time analytics DBMS
71a99ab27c
Right now streams relies on correct file size not the number of bytes that will be read from the stream, to overcome one bug in the linux kernel that may return EIINVAL for pread() with offset pass the EOF. v2: Swap read_hint and file_size (since it is easy to miss something) Before the first argument to readFile()/createReadBufferFromFileBase() was read_hint, not the file_size, and let's preserve the order, since it is easy to miss something This will also fix 02051_read_settings test automatically because now MergeTreeReaderStream will pass estimated_sum_mark_range_bytes to read_hint not file_size, previously it cause on of the following errors: - Attempt to read after EOF w/ O_DIRECT - and LOGICAL_ERROR while adjusting granulas w/o O_DIRECT This will also improve zero-length reads guard (via ReadBufferFromEmptyFile), that had been added in #30190 v3: fix for other storages that wasn't enabled in fast-test v4: ignore ENOENT/ENOTSUP in readFile |
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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 with syntax highlight and navigation.
- Contacts can help to get your questions answered if there are any.