org.apache.hadoop.hbase.mapred
Class TableReduce<K extends org.apache.hadoop.io.WritableComparable,V extends org.apache.hadoop.io.Writable>
java.lang.Object
org.apache.hadoop.mapred.MapReduceBase
org.apache.hadoop.hbase.mapred.TableReduce<K,V>
- All Implemented Interfaces:
- org.apache.hadoop.io.Closeable, org.apache.hadoop.mapred.JobConfigurable, org.apache.hadoop.mapred.Reducer<K,V,org.apache.hadoop.io.Text,org.apache.hadoop.io.MapWritable>
- Direct Known Subclasses:
- IdentityTableReduce
public abstract class TableReduce<K extends org.apache.hadoop.io.WritableComparable,V extends org.apache.hadoop.io.Writable>
- extends org.apache.hadoop.mapred.MapReduceBase
- implements org.apache.hadoop.mapred.Reducer<K,V,org.apache.hadoop.io.Text,org.apache.hadoop.io.MapWritable>
Write a table, sorting by the input key
Method Summary |
static void |
initJob(String table,
Class<? extends TableReduce> reducer,
org.apache.hadoop.mapred.JobConf job)
Use this before submitting a TableReduce job. |
abstract void |
reduce(K key,
Iterator<V> values,
org.apache.hadoop.mapred.OutputCollector<org.apache.hadoop.io.Text,org.apache.hadoop.io.MapWritable> output,
org.apache.hadoop.mapred.Reporter reporter)
|
Methods inherited from class org.apache.hadoop.mapred.MapReduceBase |
close, configure |
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.mapred.JobConfigurable |
configure |
Methods inherited from interface org.apache.hadoop.io.Closeable |
close |
TableReduce
public TableReduce()
initJob
public static void initJob(String table,
Class<? extends TableReduce> reducer,
org.apache.hadoop.mapred.JobConf job)
- Use this before submitting a TableReduce job. It will
appropriately set up the JobConf.
- Parameters:
table
- reducer
- job
-
reduce
public abstract void reduce(K key,
Iterator<V> values,
org.apache.hadoop.mapred.OutputCollector<org.apache.hadoop.io.Text,org.apache.hadoop.io.MapWritable> output,
org.apache.hadoop.mapred.Reporter reporter)
throws IOException
- Specified by:
reduce
in interface org.apache.hadoop.mapred.Reducer<K extends org.apache.hadoop.io.WritableComparable,V extends org.apache.hadoop.io.Writable,org.apache.hadoop.io.Text,org.apache.hadoop.io.MapWritable>
- Parameters:
key
- values
- output
- reporter
-
- Throws:
IOException
Copyright © 2008 The Apache Software Foundation