The below code worked.
@Shishir Saxena
package hadoop.test;
import java.util.List;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hive.conf.HiveConf;
import org.apache.hadoop.hive.metastore.HiveMetaStoreClient;
import org.apache.hadoop.security.UserGroupInformation;
import org.apache.hive.hcatalog.api.HCatClient;
import org.apache.hive.hcatalog.api.HCatTable;
import org.apache.hive.hcatalog.common.HCatConstants;
import org.apache.hive.hcatalog.common.HCatException;
import org.apache.hive.hcatalog.data.schema.HCatFieldSchema;
import org.apache.hive.hcatalog.data.schema.HCatSchema;
public class ListDBs1 {
publicstaticvoid main(String[] args) { HCatClient hcatClient = null;
try { String principal ="hive/[email protected]";
String keytab = "E:\\apps\\metacenter_home\\hadoop\\hive.keytab";
System.setProperty("sun.security.krb5.debug", "true"); System.setProperty("java.security.krb5.conf", "E:\\apps\\hadoop\\krb5.conf"); System.setProperty("java.security.auth.login.config", "E:\\apps\\hadoop\\jaas.conf"); HiveConf hcatConf = new HiveConf();
hcatConf.setVar(HiveConf.ConfVars.METASTOREURIS, "thrift://server:9083");
hcatConf.set("hadoop.security.authentication", "kerberos"); hcatConf.set(HCatConstants.HCAT_HIVE_CLIENT_DISABLE_CACHE, "true");
hcatConf.setVar(HiveConf.ConfVars.METASTORE_KERBEROS_PRINCIPAL, principal);
hcatConf.setVar(HiveConf.ConfVars.METASTORE_KERBEROS_KEYTAB_FILE, keytab);
hcatConf.setVar(HiveConf.ConfVars.METASTORE_USE_THRIFT_SASL, "true");
UserGroupInformation.setConfiguration(hcatConf);
UserGroupInformation.loginUserFromKeytab(principal, keytab);
hcatClient = HCatClient.create(new Configuration(hcatConf));
HiveMetaStoreClient hiveMetastoreClient = new HiveMetaStoreClient(hcatConf);
list(hcatClient,hiveMetastoreClient);
} catch (Throwable t) {t.printStackTrace();
} finally {if (hcatClient != null)
try {hcatClient.close();
} catch (HCatException e) { }
}
}
privatestaticvoid list(HCatClient hcatClient, HiveMetaStoreClient hiveMetastoreClient) throws Exception { List<String> dbs = hcatClient.listDatabaseNamesByPattern("*");for (String db : dbs) { System.out.println(db);
List<String> tables = hcatClient.listTableNamesByPattern(db, "*");
for (String tableString: tables) { HCatTable tbl = hcatClient.getTable(db, tableString);
String tableType = tbl.getTabletype();
String tableName = tbl.getTableName();
System.out.println(tableType + " - " + tableName);
System.out.println("Table Name is: " + tableName); System.out.println("Table Type is: " + tbl.getTabletype()); System.out.println("Table Props are: " + tbl.getTblProps()); List<HCatFieldSchema> fields = tbl.getCols();
for (HCatFieldSchema f: fields) { System.out.println("Field Name is: " + f.getName()); System.out.println("Field Type String is: " + f.getTypeString()); System.out.println("Field Type Category is: " + f.getTypeString());if (f.getCategory().equals(HCatFieldSchema.Category.STRUCT)) { HCatSchema schema = f.getStructSubSchema();
List<String> structFields = schema.getFieldNames();
for (String fieldName: structFields) { System.out.println("Struct Field Name is: " + fieldName); }
}
}
if (tableType.equalsIgnoreCase("View") || tableType.equalsIgnoreCase("VIRTUAL_VIEW")) { org.apache.hadoop.hive.metastore.api.Table viewMetastoreObject = hiveMetastoreClient.getTable(db, tableName);
String sql = viewMetastoreObject.getViewOriginalText();
System.out.println(sql);
}
}
}
}
}
