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程序去连接clickhouse集群，要求当连接到故障节点时，可以自动去连接后面的可用节点，实现高可用。

1. 新建ClickhouseDatasource，使用自定义的datasource

   @Bean(name="clickHouseDataSource")public DataSource clickHouseDataSource() throws Exception {ClickHouseDataSourceWithFailover datasource = new ClickHouseDataSourceWithFailover(ConnectInfo.ckIPs, userName, password, 5000);return datasource;}

2. 自定义ClickHouseDataSourceWithFailover，连接失败时自动连接下一个节点

public class ClickHouseDataSourceWithFailover extends ClickHouseDataSource {private final List<String> nodes;private final String username;private final String password;private final int timeout;public ClickHouseDataSourceWithFailover(List<String> nodes, String username, String password, int timeout) throws SQLException {super(String.format("jdbc:clickhouse://%s:8123/audit?connect_timeout=%d&socket_timeout=500000", nodes.get(0), timeout));this.nodes = nodes;this.username = username;this.password = password;this.timeout = timeout;}@Overridepublic ClickHouseConnection getConnection() throws SQLException {for (String node : nodes) {try {String url = String.format("jdbc:clickhouse://%s:8123/db?connect_timeout=%d&socket_timeout=500000", node, timeout);Properties properties = new Properties();properties.put("username", username);properties.put("password", password);ClickHouseDataSource dataSource = new ClickHouseDataSource(url, properties);return dataSource.getConnection();} catch (SQLException e) {log.error("Failed to connect to node: {}, ex:{}", node, e);}}throw new SQLException("Unable to connect to any ClickHouse node.");}
}