ClickHouse错误（版本21.6.6）：代码：1000 DB::Exception：异常：与所有副本的连接失败

Question

我正在尝试将 ClickHouse 与本地 MYSQL 数据库连接，即使用引擎 MySQL。我有运行这个命令来获取重要数据。

mysql> SELECT * FROM amazon_redshift.analytics limit 10;

+-------+------------+----------+------------+------------+-----------------------------+-------------------------------+-------------------------+
| count | date       | store_id | created_at | updated_at | ret_cust_rate               | orders_ret_cust               | recommendation_accuracy |
+-------+------------+----------+------------+------------+-----------------------------+-------------------------------+-------------------------+
|   875 | 2021-03-01 |   199703 | 2021-07-26 | 2021-07-26 | {"new":"1","returning":"0"} | {"new":"100","returning":"0"} | NULL                    |
|   425 | 2021-03-01 |   212743 | 2021-07-26 | 2021-07-26 | {"new":"1","returning":"0"} | {"new":"100","returning":"0"} | NULL                    |
|    81 | 2021-03-01 |   213745 | 2021-07-26 | 2021-07-26 | {"new":"1","returning":"0"} | {"new":"100","returning":"0"} | NULL                    |
|   189 | 2021-03-01 |   204112 | 2021-07-26 | 2021-07-26 | {"new":"1","returning":"0"} | {"new":"100","returning":"0"} | NULL                    |
|   309 | 2021-03-01 |   204125 | 2021-07-26 | 2021-07-26 | {"new":"1","returning":"0"} | {"new":"100","returning":"0"} | NULL                    |
|   761 | 2021-03-01 |   209940 | 2021-07-26 | 2021-07-26 | {"new":"1","returning":"0"} | {"new":"100","returning":"0"} | NULL                    |
|   699 | 2021-03-01 |   214119 | 2021-07-26 | 2021-07-26 | {"new":"1","returning":"0"} | {"new":"100","returning":"0"} | NULL                    |
|   913 | 2021-03-01 |   201062 | 2021-07-26 | 2021-07-26 | {"new":"1","returning":"0"} | {"new":"100","returning":"0"} | NULL                    |
|   792 | 2021-03-01 |   210493 | 2021-07-26 | 2021-07-26 | {"new":"1","returning":"0"} | {"new":"100","returning":"0"} | NULL                    |
|   182 | 2021-03-01 |   203925 | 2021-07-26 | 2021-07-26 | {"new":"1","returning":"0"} | {"new":"100","returning":"0"} | NULL                    |
+-------+------------+----------+------------+------------+-----------------------------+-------------------------------+-------------------------+
10 rows in set (0,00 sec)

mysql> status
--------------
mysql  Ver 8.0.25-0ubuntu0.20.04.1 for Linux on x86_64 ((Ubuntu))

Connection id:      13
Current database:   amazon_redshift
Current user:       root@localhost
SSL:            Not in use
Current pager:      stdout
Using outfile:      ''
Using delimiter:    ;
Server version:     8.0.25-0ubuntu0.20.04.1 (Ubuntu)
Protocol version:   10
Connection:     Localhost via UNIX socket
Server characterset:    utf8mb4
Db     characterset:    utf8mb4
Client characterset:    utf8mb4
Conn.  characterset:    utf8mb4
UNIX socket:        /var/run/mysqld/mysqld.sock
Binary data as:     Hexadecimal
Uptime:         2 hours 53 min 46 sec

Threads: 2  Questions: 52  Slow queries: 0  Opens: 157  Flush tables: 3  Open tables: 76  Queries per second avg: 0.004
--------------

mysql> SELECT SUBSTRING_INDEX(USER(), '@', -1) AS ip,  @@hostname as hostname, @@port as port, DATABASE() as current_database;
+-----------+--------------------------------+------+------------------+
| ip        | hostname                       | port | current_database |
+-----------+--------------------------------+------+------------------+
| localhost | helena-ZenBook-UX451FL-UX289FL | 3306 | amazon_redshift  |
+-----------+--------------------------------+------+------------------+

$ sudo lsof -i TCP:3306 
COMMAND  PID  USER   FD   TYPE DEVICE SIZE/OFF NODE NAME
mysqld  1134 mysql   27u  IPv4  42528      0t0  TCP localhost:mysql (LISTEN)

然后我运行clickHouse的docker图片：

CREATE DATABASE dummy ENGINE = Memory;

CREATE TABLE dummy.analytics
(
    `count` UInt8,
    `date` date NOT NULL,
    `store_id` bigint NOT NULL,
    `created_at` date NOT NULL,
    `updated_at` date NOT NULL,
    `ret_cust_rate` text,
    `orders_ret_cust` text,
    `recommendation_accuracy` text
)
ENGINE = MySQL('localhost:3306', 'amazon_redshift', 'analytics', 'root', 'Password9876')


SELECT *
FROM dummy.analytics
LIMIT 10;

从服务器（版本 21.6.6）收到异常：代码：1000。DB::Exception：从 clickhouse-server:9000 接收。 DB::Exception：异常：与所有副本的连接失败：amazon_redshift@localhost:3306 作为用户 root。

有人知道为什么吗？

Answer 1

原因是使用 localhost:3306，其中 localhost 指向容器，而不是外部主机。

出于测试目的考虑使用 network-settings 作为 host 以访问主机网络：

docker run --network="host" ..

作为替代方法，可以使用 docker-compose 来托管 MySQL 和 ClickHouse（参见示例）。

Answer 2

代替使用 docker 我以其他方式启动了 clickHouse 客户端：

sudo apt-get install apt-transport-https ca-certificates dirmngr
sudo apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv E0C56BD4
echo "deb https://repo.clickhouse.tech/deb/stable/ main/" | sudo tee \
    /etc/apt/sources.list.d/clickhouse.list
sudo apt-get update

sudo apt-get install -y clickhouse-server clickhouse-client

sudo service clickhouse-server start

clickhouse-client --password=<your-password>

然后使用另一个命令：

CREATE DATABASE analytics ENGINE = MySQL('127.0.0.1:3306', 'amazon_redshift', 'root', 'Password9876')

并且它像在 ClickHouse 示例中一样正常工作 (https://clickhouse.tech/docs/en/engines/database-engines/mysql/)

ClickHouse错误（版本21.6.6）：代码：1000 DB::Exception：异常：与所有副本的连接失败

ClickHouse error (version 21.6.6): Code: 1000 DB::Exception: Exception: Connections to all replicas failed

mysql

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