set_ugi not hivemetastore

`set_ugi` is a method in the Hadoop FileSystem API that sets the user/group identity for a filesystem operation. It is not related to the Hive Metastore, which is a central repository that stores metadata for Hive tables, including their schemas and locations. The purpose of the Hive Metastore is to provide a unified view of metadata for tables that can be accessed by different Hive clients.

相关问题

EXECUTE_SET_UGI什么意思

EXECUTE_SET_UGI是Hadoop中的一个权限控制命令，用于在执行Hadoop作业时设置用户和用户组信息。UGI是用户-组-权限的简称，在Hadoop中用于表示用户和用户组的信息。

在执行Hadoop作业时，需要指定作业的执行者（即用户）和执行者所属的用户组。通过执行EXECUTE_SET_UGI命令，可以将当前进程的用户和用户组设置为指定的用户和用户组，从而在执行Hadoop作业时使用指定的用户和用户组信息。

具体来说，EXECUTE_SET_UGI命令是通过调用UserGroupInformation类的setLoginUser方法来实现的。在调用setLoginUser方法后，当前进程的用户和用户组信息就会被设置为指定的用户和用户组信息，从而在执行Hadoop作业时使用指定的用户和用户组信息。

总之，EXECUTE_SET_UGI是Hadoop中的一个权限控制命令，用于在执行Hadoop作业时设置用户和用户组信息。

UGI连接hive客户端的java代码

以下是使用UGI连接Hive客户端的Java代码示例：

import java.io.IOException;
import java.security.PrivilegedExceptionAction;
import java.util.List;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.security.UserGroupInformation;
import org.apache.hadoop.security.authentication.util.KerberosName;
import org.apache.hadoop.security.token.Token;
import org.apache.hadoop.security.token.TokenIdentifier;
import org.apache.hadoop.security.token.TokenSelector;
import org.apache.hadoop.security.token.delegation.AbstractDelegationTokenSelector;
import org.apache.hadoop.security.token.delegation.AbstractDelegationTokenSecretManager;
import org.apache.hadoop.security.token.delegation.DelegationKey;
import org.apache.hadoop.security.token.delegation.ZKDelegationTokenSecretManager;
import org.apache.hadoop.security.token.delegation.ZKDelegationTokenSecretManager.ZKDTSMState;
import org.apache.hadoop.security.token.delegation.web.DelegationTokenIdentifier;
import org.apache.hadoop.security.token.delegation.web.DelegationTokenManager;
import org.apache.hadoop.security.token.delegation.web.DelegationTokenManager.HttpUserGroupInformation;
import org.apache.hadoop.security.token.delegation.web.DelegationTokenManager.KerberosDelegationTokenAuthenticator;
import org.apache.hadoop.security.token.delegation.web.DelegationTokenManager.ZKDTSMKeyOp;
import org.apache.hadoop.security.token.delegation.web.DelegationTokenManager.ZKSecretManagerState;
import org.apache.hadoop.security.token.delegation.web.ZKDelegationTokenSecretManagerForTest;
import org.apache.hadoop.security.token.delegation.web.ZKDelegationTokenSecretManagerForTest.ZKDTSMForTestState;
import org.apache.hadoop.security.token.delegation.web.ZKDelegationTokenSecretManagerForTest.ZKDelegationTokenSecretManagerForTestImpl;
import org.apache.hadoop.security.token.delegation.web.ZKDelegationTokenSecretManagerForTest.ZKDelegationTokenSecretManagerForTestState;
import org.apache.hadoop.util.StringUtils;

import org.apache.hadoop.hive.conf.HiveConf;
import org.apache.hadoop.hive.metastore.HiveMetaStoreClient;

public class HiveClientWithUGI {
  public static void main(String[] args) throws Exception {
    final String user = "hiveuser";
    final String keytabLocation = "/path/to/user.keytab";
    final String krb5Location = "/path/to/krb5.conf";

    // Set Hadoop and Hive configurations
    Configuration conf = new Configuration();
    conf.set("hadoop.security.authentication", "Kerberos");
    conf.set("hadoop.security.authorization", "true");
    conf.set("hive.metastore.sasl.enabled", "true");
    conf.set("hive.metastore.kerberos.principal", "hive/_HOST@EXAMPLE.COM");
    conf.set("hive.metastore.sasl.qop", "auth-conf");
    conf.set("hive.metastore.client.factory.class", "org.apache.hadoop.hive.metastore.hbase.HBaseMetaStoreClientFactory");

    // Set Kerberos security
    System.setProperty("java.security.krb5.conf", krb5Location);
    UserGroupInformation.setConfiguration(conf);
    UserGroupInformation.loginUserFromKeytab(user, keytabLocation);

    // Create a Hive metastore client
    HiveConf hiveConf = new HiveConf(conf, HiveConf.class);
    HiveMetaStoreClient hiveClient = new HiveMetaStoreClient(hiveConf);

    // Get list of databases
    List<String> databases = hiveClient.getAllDatabases();
    for (String database : databases) {
      System.out.println(database);
    }

    // Close the client
    hiveClient.close();
  }
}

需要注意的是，代码中涉及到了Kerberos认证和安全配置，需要根据实际情况进行调整。同时，需要根据实际的Hive Metastore服务地址和端口进行设置。此外，代码中使用了UGI来进行Kerberos认证，需要提供对应的keytab文件和krb5.conf文件。