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From "Abraham Elmahrek (JIRA)" <j...@apache.org>
Subject [jira] [Created] (SQOOP-2438) Use Class.cast when creating HiveConf object in ParquetJob
Date Wed, 29 Jul 2015 00:53:04 GMT
Abraham Elmahrek created SQOOP-2438:
---------------------------------------

             Summary: Use Class.cast when creating HiveConf object in ParquetJob
                 Key: SQOOP-2438
                 URL: https://issues.apache.org/jira/browse/SQOOP-2438
             Project: Sqoop
          Issue Type: Bug
          Components: hive-integration
    Affects Versions: 1.4.7
            Reporter: Abraham Elmahrek
             Fix For: 1.4.7


To create an instance of {{HiveMetaStoreClient}}, Sqoop needs to create an instance of the
HiveConf class. That class is difficult to pass around, so we have specific code in the {{ParquetJob.addHiveDelegationToken}}
method to create an instance of that class specifically. Using {{Class<?>.cast(...)}},
we should be able to achieve the same result, with less code.

{code}
// Need to use reflection since there's no compile time dependency on the client libs.
    Class<?> HiveConfClass;
    Class<?> HiveMetaStoreClientClass;

    try {
      HiveMetaStoreClientClass = Class.forName(HIVE_METASTORE_CLIENT_CLASS);
    } catch (ClassNotFoundException ex) {
      LOG.error("Could not load " + HIVE_METASTORE_CLIENT_CLASS
          + " when adding hive delegation token. "
          + "Make sure HIVE_CONF_DIR is set correctly.", ex);
      throw new RuntimeException("Couldn't fetch delegation token.", ex);
    }

    try {
      HiveConfClass = Class.forName(HiveConfig.HIVE_CONF_CLASS);
    } catch (ClassNotFoundException ex) {
      LOG.error("Could not load " + HiveConfig.HIVE_CONF_CLASS
          + " when adding hive delegation token."
          + " Make sure HIVE_CONF_DIR is set correctly.", ex);
      throw new RuntimeException("Couldn't fetch delegation token.", ex);
    }

    try {
      Object client = HiveMetaStoreClientClass.getConstructor(HiveConfClass).newInstance(
          HiveConfClass.getConstructor(Configuration.class, Class.class).newInstance(conf,
Configuration.class)
      );
      // getDelegationToken(String kerberosPrincial)
      Method getDelegationTokenMethod = HiveMetaStoreClientClass.getMethod("getDelegationToken",
String.class);
      Object tokenStringForm = getDelegationTokenMethod.invoke(client, UserGroupInformation.getLoginUser().getShortUserName());

      // Load token
      Token<DelegationTokenIdentifier> metastoreToken = new Token<DelegationTokenIdentifier>();
      metastoreToken.decodeFromUrlString(tokenStringForm.toString());
      conf.getCredentials().addToken(new Text(HIVE_METASTORE_TOKEN_ALIAS), metastoreToken);

      LOG.debug("Successfully fetched hive metastore delegation token. " + metastoreToken);
    } catch (Exception ex) {
      LOG.error("Couldn't fetch delegation token.", ex);
      throw new RuntimeException("Couldn't fetch delegation token.", ex);
    }
{code}



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