org.apache.hadoop.examples.terasort
Class TeraGen.SortGenMapper
java.lang.Object
org.apache.hadoop.mapreduce.Mapper<org.apache.hadoop.io.LongWritable,org.apache.hadoop.io.NullWritable,org.apache.hadoop.io.Text,org.apache.hadoop.io.Text>
org.apache.hadoop.examples.terasort.TeraGen.SortGenMapper
- Enclosing class:
- TeraGen
public static class TeraGen.SortGenMapper
- extends Mapper<org.apache.hadoop.io.LongWritable,org.apache.hadoop.io.NullWritable,org.apache.hadoop.io.Text,org.apache.hadoop.io.Text>
The Mapper class that given a row number, will generate the appropriate
output line.
Method Summary |
void |
cleanup(Mapper.Context context)
Called once at the end of the task. |
void |
map(org.apache.hadoop.io.LongWritable row,
org.apache.hadoop.io.NullWritable ignored,
Mapper.Context context)
Called once for each key/value pair in the input split. |
Methods inherited from class org.apache.hadoop.mapreduce.Mapper |
run, setup |
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
TeraGen.SortGenMapper
public TeraGen.SortGenMapper()
map
public void map(org.apache.hadoop.io.LongWritable row,
org.apache.hadoop.io.NullWritable ignored,
Mapper.Context context)
throws IOException,
InterruptedException
- Description copied from class:
Mapper
- Called once for each key/value pair in the input split. Most applications
should override this, but the default is the identity function.
- Overrides:
map
in class Mapper<org.apache.hadoop.io.LongWritable,org.apache.hadoop.io.NullWritable,org.apache.hadoop.io.Text,org.apache.hadoop.io.Text>
- Throws:
IOException
InterruptedException
cleanup
public void cleanup(Mapper.Context context)
- Description copied from class:
Mapper
- Called once at the end of the task.
- Overrides:
cleanup
in class Mapper<org.apache.hadoop.io.LongWritable,org.apache.hadoop.io.NullWritable,org.apache.hadoop.io.Text,org.apache.hadoop.io.Text>
Copyright © 2009 The Apache Software Foundation