Package org.apache.hadoop.mapred.nativetask.serde

Interface INativeSerializer<T>

All Known Implementing Classes:

BoolWritableSerializer, BytesWritableSerializer, ByteWritableSerializer, DefaultSerializer, DoubleWritableSerializer, FloatWritableSerializer, IntWritableSerializer, LongWritableSerializer, NullWritableSerializer, TextSerializer, VIntWritableSerializer, VLongWritableSerializer

@Public
@Evolving
public interface INativeSerializer<T>

an INativeSerializer serializes and deserializes data transferred between Java and native. DefaultSerializer provides default implementations. Note: if you implemented your customized NativeSerializer instead of DefaultSerializer, you have to make sure the native side can serialize it correctly.

Method Summary

Modifier and Type	Method	Description
void	deserialize(java.io.DataInput in, int length, T w)
int	getLength(T w)	get length of data to be serialized.
void	serialize(T w, java.io.DataOutput out)

Method Detail

getLength

int getLength(T w)
       throws java.io.IOException

get length of data to be serialized. If the data length is already known (like IntWritable) and could immediately be returned from this method, it is good chance to implement customized NativeSerializer for efficiency

Throws:

java.io.IOException

serialize

void serialize(T w,
               java.io.DataOutput out)
        throws java.io.IOException

Throws:

java.io.IOException

deserialize

void deserialize(java.io.DataInput in,
                 int length,
                 T w)
          throws java.io.IOException

Throws:

java.io.IOException