6.ClickHouse系列之配置分片集群

副本集对数据进行完整备份，数据高可用，对于分片集群来说，不管是ES还是ClickHouse是为了解决数据横向扩展的问题，ClickHouse在实际应用中一般配置副本集就好了

1. 编写clickhouse-shard.yml文件

具体代码已上传至gitee,可直接克隆使用

# 副本集部署示例
version: '3'
services:
  zoo1:
    image: zookeeper
    restart: always
    hostname: zoo1
    ports:
      - 2181:2181
    environment:
      ZOO_MY_ID: 1
      ZOO_SERVERS: server.1=zoo1:2888:3888;2181 server.2=zoo2:2888:3888;2181 server.3=zoo3:2888:3888;2181
    networks:
      - ckNet

  zoo2:
    image: zookeeper
    restart: always
    hostname: zoo2
    ports:
      - 2182:2181
    environment:
      ZOO_MY_ID: 2
      ZOO_SERVERS: server.1=zoo1:2888:3888;2181 server.2=zoo2:2888:3888;2181 server.3=zoo3:2888:3888;2181
    networks:
      - ckNet
  zoo3:
    image: zookeeper
    restart: always
    hostname: zoo3
    ports:
      - 2183:2181
    environment:
      ZOO_MY_ID: 3
      ZOO_SERVERS: server.1=zoo1:2888:3888;2181 server.2=zoo2:2888:3888;2181 server.3=zoo3:2888:3888;2181
    networks:
      - ckNet
  ck1_1:
    image: clickhouse/clickhouse-server
    container_name: ck1_1
    ulimits:
      nofile:
        soft: "262144"
        hard: "262144"
    volumes:
      - ./1_1/config.d:/etc/clickhouse-server/config.d
      - ./config.xml:/etc/clickhouse-server/config.xml
    ports:
      - 18123:8123 # http接口用
      - 19000:9000 # 本地客户端用
    depends_on:
      - zoo1
      - zoo2
      - zoo3
    networks:
      - ckNet
  ck1_2:
    image: clickhouse/clickhouse-server
    container_name: ck1_2
    ulimits:
      nofile:
        soft: "262144"
        hard: "262144"
    volumes:
      - ./1_2/config.d:/etc/clickhouse-server/config.d
      - ./config.xml:/etc/clickhouse-server/config.xml
    ports:
      - 18124:8123 # http接口用
      - 19001:9000 # 本地客户端用
    depends_on:
      - zoo1
      - zoo2
      - zoo3
    networks:
      - ckNet
  ck2_1:
    image: clickhouse/clickhouse-server
    container_name: ck2_1
    ulimits:
      nofile:
        soft: "262144"
        hard: "262144"
    volumes:
      - ./2_1/config.d:/etc/clickhouse-server/config.d
      - ./config.xml:/etc/clickhouse-server/config.xml
    ports:
      - 18125:8123 # http接口用
      - 19002:9000 # 本地客户端用
    depends_on:
      - zoo1
      - zoo2
      - zoo3
    networks:
      - ckNet
  ck2_2:
    image: clickhouse/clickhouse-server
    container_name: ck2_2
    ulimits:
      nofile:
        soft: "262144"
        hard: "262144"
    volumes:
      - ./2_2/config.d:/etc/clickhouse-server/config.d
      - ./config.xml:/etc/clickhouse-server/config.xml
    ports:
      - 18126:8123 # http接口用
      - 19003:9000 # 本地客户端用
    depends_on:
      - zoo1
      - zoo2
      - zoo3
    networks:
      - ckNet


networks:
  ckNet:
    driver: bridge

修改config.xml导入的文件名称为metrika_shard

 <include_from>/etc/clickhouse-server/config.d/metrika_shard.xml</include_from>

2. 分片副本具体配置

我们配置了了2个分片，每个分片1个副本，目录如下

每个目录下metrika_shard.xml配置如下

<?xml version="1.0" encoding="utf-8" ?>
<yandex>
    <remote_servers>
        <shenjian_cluster>
            <!-- 分片1 -->
            <shard>
                <internal_replication>true</internal_replication>
                <replica>
                    <!-- 第一个副本 -->
                    <host>ck1_1</host>
                    <port>9000</port>
                </replica>
                <replica>
                    <!-- 第二个副本,生产环境中不同副本分布在不同机器 -->
                    <host>ck1_2</host>
                    <port>9000</port>
                </replica>
            </shard>
            <!-- 分片2 -->
            <shard>
                <internal_replication>true</internal_replication>
                <replica>
                    <host>ck2_1</host>
                    <port>9000</port>
                </replica>
                <replica>
                    <host>ck2_2</host>
                    <port>9000</port>
                </replica>
            </shard>
        </shenjian_cluster>
    </remote_servers>
    <zookeeper-servers>
        <node index="1">
            <host>zoo1</host>
            <port>2181</port>
        </node>
        <node index="2">
            <host>zoo2</host>
            <port>2181</port>
        </node>
        <node index="3">
            <host>zoo3</host>
            <port>2181</port>
        </node>
    </zookeeper-servers>
    <!-- 分片副本标识 -->
    <macros>
        <shard>01</shard>
        <replica>rep-01-01</replica>
    </macros>
</yandex>

对于其他三个，只需要修改shard replica标识即可

<macros>
        <shard>01</shard>
        <replica>rep-01-02</replica>
</macros>

<macros>
        <shard>02</shard>
        <replica>rep-02-01</replica>
</macros>

<macros>
        <shard>02</shard>
        <replica>rep-02-02</replica>
</macros>

OK,至此为止，可以docker-compose -f clickhouse-shard.yml up -d启动了

3. 创建表

请将shenjian_cluster改为自己集群的名称，也就是metrika_shard.xml中remote_servers子标签，shard与replica无需改动，clickhouse会自动查找匹配的配置，为此集群下所有节点创建该表

CREATE TABLE house ON CLUSTER shenjian_cluster
(
    id String,
    city String,
    region String,
    name String,
    price Float32,
    publish_date DateTime
) ENGINE=ReplicatedMergeTree('/clickhouse/table/{shard}/house', '{replica}') PARTITION BY toYYYYMMDD(publish_date) PRIMARY KEY(id) ORDER BY (id, city, region, name)

创建后，可以看到所有节点【127.0.0.1:18123 127.0.0.1:18124 127.0.0.1:18125 127.0.0.1:18126】都存在了该表，正确

4. 创建distribute表

CREATE TABLE distribute_house ON CLUSTER shenjian_cluster
(
    id String,
    city String,
    region String,
    name String,
    price Float32,
    publish_date DateTime
) ENGINE=Distributed(shenjian_cluster, default, house, hiveHash(publish_date))

• house： 表名
• hiveHash(city): 分片键

5. 新增数据验证分片集群

INSERT INTO distribute_house(city, name, price, publish_date) VALUES ('上海', '场中小区', 59680, '2022-08-01'),
                                            ('上海', '汤臣一品', 259680, '2022-08-01'),
                                            ('临沂', '滨河名邸', 10000, '2021-08-01'),
                                            ('临沂', '中泰广场', 15000, '2020-08-01');

OK,分片集群成功，快给自己鼓掌吧！！！！

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