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ClickHouse® is a real-time analytics DBMS
1ce9293e97
Found in [1]:
2021.03.12 23:32:58.897190 [ 436606 ] {97a08a8f-4630-44f8-ba18-a94c6fabbded} <Information> test_13.lc_empty_part_bug: Waiting mutation: mutation_3.txt
...
2021.03.12 23:32:58.900444 [ 374 ] {} <Debug> test_13.lc_empty_part_bug: Current max source part size for mutation is 0 but part size 1. Will not mutate part all_1_1_0_2. Max size depends not only on available space, but also on settings 'number_of_free_entries_in_pool_to_execute_mutation' and 'background_pool_size'
...
Hang check:
query: alter table lc_empty_part_bug modify column s LowCardinality(String);
elapsed: 2156.396613506
[1]: https://clickhouse-test-reports.s3.yandex.net/21511/d7d9638ceb6bd702f34a88ee54f8f83197e90af5/stress_test_(address).html#fail1
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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 quick high-level overview of ClickHouse on main page.
- Tutorial shows how to set up and query 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 to chat 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.
- You can also fill this form to meet Yandex ClickHouse team in person.