mysql - 无法通过节俭获取Hive远程Metastore表信息

我可以使用以下程序通过hive获取有关本地mysql metastore设置的metastore表信息。

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();
            }
        }

    }
}

当前正在尝试上述程序使用thrift从远程metastore获取metastore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

没有以下参数:

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

因此，我该如何通过节俭协议(protocol)来获取元表信息。我在host2上运行以上代码。请提出建议。

另外，当我运行上面的代码时，它显示有关以下信息:

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"

最佳答案

替换您的代码的这一部分:

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));

和以下:

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元存储数据库的名称，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));
}

看看您是否正在获取metastore表名称。