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ClickHouse® is a real-time analytics DBMS
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Azat Khuzhin 83d68246c3 Fix LOGICAL_ERROR on connection draining in case of ECONNRESET 
In case of ECONNRESET (Connection reset by peer) the "cancelled" will
not be set, and so drain() will fail with LOGICAL_ERROR:

<details>

    2021.10.16 04:10:55.054771 [ 7635 ] {882164e0-ca26-4955-8759-708ba1f6e85c} <Error> PullingAsyncPipelineExecutor: Code: 210. DB::NetException: Connection reset by peer, while writing to socket (127.0.0.2:9000). (NETWORK_ERROR), Stack trace (when copying this message, always include the lines below):

    ...
    4. ./obj-x86_64-linux-gnu/../src/Common/NetException.h:12: DB::NetException::NetException(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&, int) @ 0x20db5749 in /usr/bin/clickhouse
    5. ./obj-x86_64-linux-gnu/../src/IO/WriteBufferFromPocoSocket.cpp:56: DB::WriteBufferFromPocoSocket::nextImpl() @ 0x211d56bb in /usr/bin/clickhouse
    6. ./obj-x86_64-linux-gnu/../src/IO/WriteBuffer.h:47: DB::WriteBuffer::next() @ 0x14e4c874 in /usr/bin/clickhouse
    7. ./obj-x86_64-linux-gnu/../src/Client/Connection.cpp:560: DB::Connection::sendCancel() @ 0x227c0c22 in /usr/bin/clickhouse
    8. ./obj-x86_64-linux-gnu/../src/Client/HedgedConnections.cpp:242: DB::HedgedConnections::sendCancel() @ 0x227f1b53 in /usr/bin/clickhouse
    ...
    2021.10.16 04:12:35.555530 [ 5575 ] {} <Fatal> : Logical error: 'Cannot drain connections: cancel first.'.

</details>

Found by stress tests on CI [1].

  [1]: https://clickhouse-test-reports.s3.yandex.net/0/d3cb99701d4aaec384fd183168d10e0f650ecc1d/stress_test_(debug).html#fail1
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.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
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.vimrc Changed tabs to spaces in editor configs and in style guide [#CLICKHOUSE-3]. 2017-04-01 11:35:09 +03:00
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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.