BalancedClickhouseDataSource; 负载均衡在0.3.2版本怎么支持以及后面版本怎么规划的的这个功能是？

[kiwimg]

ru.yandex.clickhouse.BalancedClickhouseDataSource; 负载均衡在0.3.2版本怎么支持以及后面版本怎么规划的的这个功能是？

[zhicwu]

ru.yandex.clickhouse.BalancedClickhouseDataSource; 负载均衡在0.3.2版本怎么支持以及后面版本怎么规划的的这个功能是？

Since the driver uses http protocol by default, I'd suggest you using middleware like chproxy, nginx or traefik etc. for load balancing.

As to the driver itself, I hope to re-write ClickHouseCluster in 0.3.3, which will simplify the way to connect to multiple nodes, for example:

// Java client
ClickHouseNode server1 = ClickHouseNode.of(...);
ClickHouseCluster cluster1 = ClickHouseCluster.of("cluster1", server1); // discover the rest nodes of cluster1
ClickHouseNodes nodes = ClickHouseNodes.of(server1, cluster1, ...); // list of nodes may or may not belong to a cluster

ClickHouseResponse resp = client.connect(nodes) // intention to connect to a node within the list
  .query("select 1")
  .execute() // pick one node from nodes and execute from there
  .get();

// JDBC driver will support multiple hosts(and protocols) in connection string like:
// jdbc:ch://ip1:port1,ip2:port2,.../database

[kiwimg]

thanks

[kiwimg]

现在 0.3.1 使用的 BalancedClickhouseDataSource。如果升级到 0.3.2版本，对应的 BalancedClickhouseDataSource应该替换成什么？是替换成clickhouse-client 模块下面ClickHouseCluster 对吧。
ClickHouseCluster 在这个clickhouse-client 模块下面。我理解 clickhouse-jdbc 、clickhouse-tcp-client、 clickhouse-http-client 这几个模块的作用，是不是 clickhouse-client 是一个通用的入口，然后指定不同协议就可以调用不同协议模块、

[zhicwu]

Sorry I'll write a guide for upgrading legacy JDBC driver to new one.

如果升级到 0.3.2版本，对应的 BalancedClickhouseDataSource应该替换成什么？

As I mentioned here, we'll only need to specify multiple hosts in connection string.

我理解 clickhouse-jdbc 、clickhouse-tcp-client、 clickhouse-http-client 这几个模块的作用，是不是 clickhouse-client 是一个通用的入口，然后指定不同协议就可以调用不同协议模块、

Correct. You may refer to the class diagram at here. By the way, clickhouse-cli-client is available on develop branch. It implemented clickhouse-client interfaces like clickhouse-http-client and clickhouse-grpc-client, but it's actually a wrapper of ClickHouse native command line.