Hello,
I want to output a class which I have written as the value of the map phase.
The obvious was is to implement the Writable interface but the problem is
the class has other classes as its member properties. The DataInput and
DataOutput interfaces used by the read and write methods of the
Take a look at the sample given in Javadoc of Writable.java
You need to serialize your data yourself:
@Override
public void readFields(DataInput in) throws IOException {
h = Text.readString(in);
sc = in.readFloat();
ran = in.readInt ();
}
On Tue, Apr 27, 2010 at
Can I use the Serializable interface? Alternatively, is there any way to
specify OutputFormatter for mappers like we can do for reducers?
Thanks,
Farhan
On Tue, Apr 27, 2010 at 1:19 PM, Ted Yu yuzhih...@gmail.com wrote:
Take a look at the sample given in Javadoc of Writable.java
You need to
I tried to use a class which implements the Serializable interface and got
the following error:
java.lang.NullPointerException
at
org.apache.hadoop.io.serializer.SerializationFactory.getSerializer(SerializationFactory.java:73)
at
Can you try adding 'org.apache.hadoop.io.serializer.JavaSerialization,' to
the following config ?
C:\hadoop-0.20.2\src\core\core-default.xml(87,9):
nameio.serializations/name
By default, only org.apache.hadoop.io.serializer.WritableSerialization is
included.
On Tue, Apr 27, 2010 at 3:55 PM,
