HDPUtils (guagua-mapreduce 0.7.10 API)

java.lang.Object
- ml.shifu.guagua.hadoop.util.HDPUtils

```
public class HDPUtils
extends Object
```
For HortonWorks HDP 2.2.4 two issues not caomptible with other hadoop 2.x versions.
Two major issues include:
- 1. Cannot find hdp.version on the fly, we need find the version firstly and we need find such number from dependency jar and set it on Hadoop Configuration object.
- 2. HADOOP_CONF_DIR is not set as classpath in classpath of every container, which make Shifu UDF and mapper/reducer cannot read configuration from HDFS. To solve it we have to find such configuration files like 'yarn-site.xml', 'core-site.xml', 'hdfs-site.xml' and 'mapred-site.xml' on client class path and ship them to container classpath as distributed cache files or jars.
Author:

Zhang David (pengzhang@paypal.com)

Constructor Summary

Constructors
Constructor Description

HDPUtils()

Method Summary

All Methods Static Methods Concrete Methods
Modifier and Type	Method	Description
`static void`	`addFileToClassPath(String file, org.apache.hadoop.conf.Configuration conf)`	Add a hdfs file to classpath of one container.
`static String`	`findContainingFile(String fileName)`	Find a real file that contains file name in class path.
`static String`	`findContainingJar(Class my_class)`
`static String`	`getHdpVersionForHDP224()`	A ugly method to retrieve hdp version like 2.2.4.6633 from hadoop-hdfs jar name.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - HDPUtils
```
public HDPUtils()
```
- Method Detail
  - getHdpVersionForHDP224
```
public static String getHdpVersionForHDP224()
```
    A ugly method to retrieve hdp version like 2.2.4.6633 from hadoop-hdfs jar name. The jar name is like 'hadoop-hdfs-2.6.0.2.2.4.6633.jar'.
  - addFileToClassPath
```
public static void addFileToClassPath(String file,
                                      org.apache.hadoop.conf.Configuration conf)
                               throws IOException
```
    Add a hdfs file to classpath of one container.
    
    Throws:
    
    IOException
  - findContainingFile
```
public static String findContainingFile(String fileName)
```
    Find a real file that contains file name in class path.
    
    Parameters:
    
    fileName - the file name
    
    Returns:
    
    real file name
  - findContainingJar
```
public static String findContainingJar(Class my_class)
```