org.apache.hadoop.examples
Class Sort<K,V>
java.lang.Object
org.apache.hadoop.conf.Configured
org.apache.hadoop.examples.Sort<K,V>
- All Implemented Interfaces:
- org.apache.hadoop.conf.Configurable, org.apache.hadoop.util.Tool
public class Sort<K,V>
- extends org.apache.hadoop.conf.Configured
- implements org.apache.hadoop.util.Tool
This is the trivial map/reduce program that does absolutely nothing
other than use the framework to fragment and sort the input values.
To run: bin/hadoop jar build/hadoop-examples.jar sort
[-r reduces]
[-inFormat input format class]
[-outFormat output format class]
[-outKey output key class]
[-outValue output value class]
[-totalOrder pcnt num samples max splits]
in-dir out-dir
Constructor Summary |
Sort()
|
Method Summary |
Job |
getResult()
Get the last job that was run using this instance. |
static void |
main(String[] args)
|
int |
run(String[] args)
The main driver for sort program. |
Methods inherited from class org.apache.hadoop.conf.Configured |
getConf, setConf |
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Methods inherited from interface org.apache.hadoop.conf.Configurable |
getConf, setConf |
REDUCES_PER_HOST
public static final String REDUCES_PER_HOST
- See Also:
- Constant Field Values
Sort
public Sort()
run
public int run(String[] args)
throws Exception
- The main driver for sort program.
Invoke this method to submit the map/reduce job.
- Specified by:
run
in interface org.apache.hadoop.util.Tool
- Throws:
IOException
- When there is communication problems with the
job tracker.
Exception
main
public static void main(String[] args)
throws Exception
- Throws:
Exception
getResult
public Job getResult()
- Get the last job that was run using this instance.
- Returns:
- the results of the last job that was run
Copyright © 2009 The Apache Software Foundation