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ClickHouse® is a real-time analytics DBMS
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Azat Khuzhin 9a71598973 Fix table lifetime in case of parallel DROP TABLE and INSERT 
Stress tests founds [1]:

==527==WARNING: MemorySanitizer: use-of-uninitialized-value
    0 0x37078ffd in unsigned long std::__1::__cxx_atomic_fetch_add<unsigned long>(std::__1::__cxx_atomic_base_impl<unsigned long>*, unsigned long, std::__1::memory_order) obj-x86_64-linux-gnu/../contrib/libcxx/include/atomic:1050:12
    1 0x37078ffd in std::__1::__atomic_base<unsigned long, true>::fetch_add(unsigned long, std::__1::memory_order) obj-x86_64-linux-gnu/../contrib/libcxx/include/atomic:1719:17
    2 0x37078ffd in std::__1::__atomic_base<unsigned long, true>::operator++() obj-x86_64-linux-gnu/../contrib/libcxx/include/atomic:1756:57
    3 0x37078ffd in SimpleIncrement::get() obj-x86_64-linux-gnu/../src/Common/SimpleIncrement.h:20:16
    4 0x37078ffd in DB::MergeTreeDataWriter::writeTempPart(DB::BlockWithPartition&, std::__1::shared_ptr<DB::StorageInMemoryMetadata const> const&, std::__1::shared_ptr<DB::Context const>) obj-x86_64-linux-gnu/../src/Storages/MergeTree/MergeTreeDataWriter.cpp:276:46
    5 0x373c446c in DB::MergeTreeSink::consume(DB::Chunk) obj-x86_64-linux-gnu/../src/Storages/MergeTree/MergeTreeSink.cpp:27:65

  Uninitialized value was created by a heap deallocation
    6 0x32d481e8 in DB::DatabaseCatalog::TableMarkedAsDropped::~TableMarkedAsDropped() obj-x86_64-linux-gnu/../src/Interpreters/DatabaseCatalog.h:248:12
    7 0x32d3c134 in DB::DatabaseCatalog::dropTableDataTask() obj-x86_64-linux-gnu/../src/Interpreters/DatabaseCatalog.cpp:908:1

  [1]: https://s3.amazonaws.com/clickhouse-test-reports/32534/fa6090f588dbf4cbb5f28bd2210847b070bb8218/stress_test__memory__actions_.html

The query was CREATE MATERIALIZED VIEW ... POPULATE AS SELECT ... from
00040_aggregating_materialized_view test.
2021-12-11 11:00:31 +03:00
.github Revert "Revert "Split long tests into multiple checks"" 2021-12-10 18:39:02 +03:00
base Revert "graphite: split tagged/plain rollup rules (for merges perfomance)" 2021-12-08 15:49:21 +01:00
benchmark Add benchmark for DuckDB 2021-10-31 21:05:07 +03:00
cmake terminate build when linker path not found 2021-12-09 15:17:24 +08:00
contrib Merge branch 'master' into update-mongo-contrb 2021-12-10 08:57:16 +00:00
debian Auto version update to [21.13.1.1] [54458] 2021-12-09 00:33:01 +03:00
docker Merge pull request #32460 from kssenii/mongo-extend-auth 2021-12-11 10:42:15 +03:00
docs Merge pull request #32498 from Vxider/rename-window-view-functions 2021-12-10 22:07:53 +03:00
programs Fix processing initial table (--table/stdin) in clickhouse-local 2021-12-10 22:08:03 +03:00
src Fix table lifetime in case of parallel DROP TABLE and INSERT 2021-12-11 11:00:31 +03:00
tests Merge pull request #32534 from azat/local-file-table-fix 2021-12-11 10:45:19 +03:00
utils Revert "graphite: split tagged/plain rollup rules (for merges perfomance)" 2021-12-08 15:49:21 +01:00
website Merge pull request #31490 from flickerbox/crb-support-page 2021-12-03 19:13:05 +03:00
.clang-format Fixed wrong code around Memory Profiler 2020-03-03 03:24:44 +03:00
.clang-tidy Revert "Revert "Fix tidy"" 2021-09-06 12:16:52 +03:00
.editorconfig Changed tabs to spaces in editor configs and in style guide [#CLICKHOUSE-3]. 2017-04-01 11:35:09 +03:00
.gitattributes Union merge for arcadia_skip_list.txt to avoid frequent conflicts 2021-03-10 08:50:32 +03:00
.gitignore fix style check 2021-09-21 10:28:33 +03:00
.gitmodules Merge pull request #31951 from Algunenano/libcxx13 2021-11-30 05:23:23 +03:00
.potato.yml Fix yamllint issues 2021-02-20 23:25:21 +03:00
.pylintrc Add pylintrc config 2021-01-26 23:35:56 +03:00
.vimrc Changed tabs to spaces in editor configs and in style guide [#CLICKHOUSE-3]. 2017-04-01 11:35:09 +03:00
.yamllint Drop truthy.check-keys from yamllint (does not supported on CI) 2021-02-21 06:15:36 +03:00
AUTHORS Update AUTHORS 2021-09-22 11:38:03 +03:00
CHANGELOG.md Update CHANGELOG.md 2021-11-18 12:50:41 +03:00
CMakeLists.txt More comments and style 2021-12-06 21:34:52 +00:00
CODE_OF_CONDUCT.md Add minimal code of conduct #9676 2020-03-16 12:44:28 +03:00
CONTRIBUTING.md Remove old CLA 2021-09-28 20:16:33 +03:00
docker-compose.yml Change Docker org name 2021-09-20 01:52:21 +03:00
format_sources allow several <graphite> targets (#603) 2017-03-21 23:08:09 +04:00
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release Proper build 2021-08-24 00:09:19 +00:00
SECURITY.md Update SECURITY.md 2021-11-25 00:59:52 +03:00
uncrustify.cfg Better .clang-format and uncrustify.cfg 2018-11-29 15:45:34 +03:00

README.md

ClickHouse — open source distributed column-oriented DBMS

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.