mysql - 无法通过节俭获取配置单元远程 Metastore 表信息

Question

我可以使用以下程序获取本地 mysql 元存储设置中的元存储表信息以及配置单元。

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;

import org.apache.hadoop.fs.Path;
import org.apache.hadoop.hive.conf.HiveConf;
import org.apache.hadoop.hive.conf.HiveConf.ConfVars;

public class MetaStoreTest {

    public static void main(String[] args) throws Exception {

        Connection conn = null;
        try {
            HiveConf conf = new HiveConf();
            conf.addResource(new Path("/home/hadoop/hive-0.12.0/conf/hive-site.xml"));
            Class.forName(conf.getVar(ConfVars.METASTORE_CONNECTION_DRIVER));
            conn = DriverManager.getConnection(
                    conf.getVar(ConfVars.METASTORECONNECTURLKEY),
                    conf.getVar(ConfVars.METASTORE_CONNECTION_USER_NAME),
                    conf.getVar(ConfVars.METASTOREPWD));

            Statement st = conn.createStatement();
            ResultSet rs = st.executeQuery(
                "select t.tbl_name, s.location from TBLS t " +
                "join SDS s on t.sd_id = s.sd_id");
            while (rs.next()) {
                System.out.println(rs.getString(1) + " : " + rs.getString(2));
            }
        }
        finally {
            if (conn != null) {
                conn.close();
            }
        }

    }
}

目前我正在尝试使用上面的程序使用节俭从远程元存储获取元存储表。在我当前的 hive-site.xml 中，我有这些参数，

hive.metastore.uris = thrift://host1:9083, thrift://host2:9083
hive.metastore.local = false

没有参数:

javax.jdo.option.ConnectionDriverName, javax.jdo.option.ConnectionUserName, javax.jdo.option.ConnectionPassword

那么，我如何通过节俭协议(protocol)获取元表信息。我在 host2 上运行上面的代码。请提出建议。

另外，当我运行上面的代码时，它会显示以下信息:

METASTORE_CONNECTION_DRIVER as derby connection embedded driver, 
METASTORECONNECTURLKEY as jdbc:mysql://<host name>/<database name>?createDatabaseIfNotExist=true, 
METASTORE_CONNECTION_USER_NAME as "APP" and 
METASTOREPWD as "mine"

Answer 1

替换这部分代码:

conf.addResource(new Path("/home/hadoop/hive-0.12.0/conf/hive-site.xml"));
Class.forName(conf.getVar(ConfVars.METASTORE_CONNECTION_DRIVER));
conn = DriverManager.getConnection(
       conf.getVar(ConfVars.METASTORECONNECTURLKEY),
       conf.getVar(ConfVars.METASTORE_CONNECTION_USER_NAME),
       conf.getVar(ConfVars.METASTOREPWD));

以下:

Class.forName("com.mysql.jdbc.Driver");
conn = DriverManager.getConnection("jdbc:mysql://host2:3306/metastore", "urusername", "urpassword");

[注意:根据您的设置相应地更改 Metastore 数据库名称、用户和密码。]

现在:

Statement st = conn.createStatement();
ResultSet rs = st.executeQuery("show tables");
while (rs.next()) {
   System.out.println("Tables:" +rs.getString(1));
}

看看你是否获得了 Metastore 表名。