org.apache.hadoop.dynamodb.write

Class AbstractDynamoDBRecordWriter<K,V>

java.lang.Object

org.apache.hadoop.dynamodb.write.AbstractDynamoDBRecordWriter<K,V>

Type Parameters:

K - The type of Key received from the reducer

V - The type of Value received from the reducer

All Implemented Interfaces:

org.apache.hadoop.mapred.RecordWriter<K,V>

Direct Known Subclasses:

DefaultDynamoDBRecordWriter

public abstract class AbstractDynamoDBRecordWriter<K,V>
extends Object
implements org.apache.hadoop.mapred.RecordWriter<K,V>

AbstractDynamoDBRecordWriter does all the backend work for reading in key-value pairs from the reducer and writing them to DynamoDB. To use the DynamoDBRecordWriter class, you need to subclass this and overwrite the convertValueToDynamoDBItemWritable with a conversion from the input Value to a DynamoDBItemWritable. As an alternative, you can also use DefaultDynamoDBRecordWriter, and do the conversion to a DynamoDBItemWritable inside of the reducer.

Constructor Summary

Constructors

Constructor and Description
AbstractDynamoDBRecordWriter(org.apache.hadoop.mapred.JobConf jobConf, org.apache.hadoop.util.Progressable progressable)

Method Summary

Modifier and Type	Method and Description
void	close(org.apache.hadoop.mapred.Reporter reporter)
void	write(K key, V value)

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

AbstractDynamoDBRecordWriter

public AbstractDynamoDBRecordWriter(org.apache.hadoop.mapred.JobConf jobConf,
                                    org.apache.hadoop.util.Progressable progressable)

Method Detail

write

public void write(K key,
                  V value)
           throws IOException

Specified by:

write in interface org.apache.hadoop.mapred.RecordWriter<K,V>

Throws:

IOException

close

public void close(org.apache.hadoop.mapred.Reporter reporter)
           throws IOException

Specified by:

close in interface org.apache.hadoop.mapred.RecordWriter<K,V>

Throws:

IOException