/**
    * 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.hadoop.hbase.util;
  
  import org.apache.hadoop.conf.Configuration;
  import org.apache.hadoop.hbase.HBaseConfiguration;
  import org.apache.hadoop.hbase.HBaseInterfaceAudience;
  import org.apache.hadoop.hbase.classification.InterfaceAudience;
  import org.apache.hadoop.hbase.mapreduce.TableMapReduceUtil;
  import org.apache.hadoop.util.Tool;
  import org.apache.hadoop.util.ToolRunner;
  import org.apache.log4j.Level;
  import org.apache.log4j.Logger;
  
  /**
   * Generate a classpath string containing any jars required by mapreduce jobs. Specify
   * additional values by providing a comma-separated list of paths via -Dtmpjars.
   */
  @InterfaceAudience.LimitedPrivate(HBaseInterfaceAudience.TOOLS)
  public class MapreduceDependencyClasspathTool implements Tool {
  
    private Configuration conf;
  
    @Override
    public void setConf(Configuration conf) {
      this.conf = conf;
    }
  
    @Override
    public Configuration getConf() {
      return conf;
    }
  
    @Override
    public int run(String[] args) throws Exception {
      if (args.length > 0) {
        System.err.println("Usage: hbase mapredcp [-Dtmpjars=...]");
        System.err.println("  Construct a CLASSPATH containing dependency jars required to run a mapreduce");
        System.err.println("  job. By default, includes any jars detected by TableMapReduceUtils. Provide");
        System.err.println("  additional entries by specifying a comma-separated list in tmpjars.");
        return 0;
      }
  
      TableMapReduceUtil.addHBaseDependencyJars(getConf());
      System.out.println(TableMapReduceUtil.buildDependencyClasspath(getConf()));
      return 0;
    }
  
    public static void main(String[] argv) throws Exception {
      // Silence the usual noise. This is probably fragile...
      Logger logger = Logger.getLogger("org.apache.hadoop.hbase");
      if (logger != null) {
        logger.setLevel(Level.WARN);
      }
      System.exit(ToolRunner.run(
        HBaseConfiguration.create(), new MapreduceDependencyClasspathTool(), argv));
    }
  }