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A table format for huge analytic datasets

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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.iceberg.hive;

import java.io.IOException;
import org.apache.hadoop.security.UserGroupInformation;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class HiveHadoopUtil {

  private static final Logger LOG = LoggerFactory.getLogger(HiveHadoopUtil.class);

  private HiveHadoopUtil() {}

  public static String currentUser() {
    String username = null;
    try {
      username = UserGroupInformation.getCurrentUser().getShortUserName();
    } catch (IOException e) {
      LOG.warn("Failed to get Hadoop user", e);
    }

    if (username != null) {
      return username;
    } else {
      LOG.warn("Hadoop user is null, defaulting to user.name");
      return System.getProperty("user.name");
    }
  }
}