com.thinkaurelius.titan.hadoop

Class TitanIndexRepairMapper

java.lang.Object

org.apache.hadoop.mapreduce.Mapper<org.apache.hadoop.io.NullWritable,FaunusVertex,org.apache.hadoop.io.NullWritable,org.apache.hadoop.io.NullWritable>

com.thinkaurelius.titan.hadoop.TitanIndexRepairMapper

public class TitanIndexRepairMapper
extends org.apache.hadoop.mapreduce.Mapper<org.apache.hadoop.io.NullWritable,FaunusVertex,org.apache.hadoop.io.NullWritable,org.apache.hadoop.io.NullWritable>

Given (1) an InputFormat that iterates a Titan edgestore and converts each row into a FaunusVertex and (2) the name of an already-defined index in either the REGISTERED or ENABLED state, consider each FaunusVertex and rebuild the named index accordingly. The index is written through a TitanGraph instance. The KEYOUT and VALUEOUT type parameters are NullWritable because this Mapper produces no conventional SequenceFile output. There's nothing to combine or reduce since the writes go through TitanGraph and its non-Hadoop backend interface.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	TitanIndexRepairMapper.Counters

Nested classes/interfaces inherited from class org.apache.hadoop.mapreduce.Mapper

org.apache.hadoop.mapreduce.Mapper.Context

Constructor Summary

Constructors

Constructor and Description
TitanIndexRepairMapper()

Method Summary

Modifier and Type	Method and Description
void	cleanup(org.apache.hadoop.mapreduce.Mapper.Context context)
void	map(org.apache.hadoop.io.NullWritable key, FaunusVertex faunusVertex, org.apache.hadoop.mapreduce.Mapper.Context context)
void	setup(org.apache.hadoop.mapreduce.Mapper.Context context)

Methods inherited from class org.apache.hadoop.mapreduce.Mapper

run

Methods inherited from class java.lang.Object

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

Constructor Detail

TitanIndexRepairMapper

public TitanIndexRepairMapper()

Method Detail

setup

public void setup(org.apache.hadoop.mapreduce.Mapper.Context context)
           throws IOException

Overrides:

setup in class org.apache.hadoop.mapreduce.Mapper<org.apache.hadoop.io.NullWritable,FaunusVertex,org.apache.hadoop.io.NullWritable,org.apache.hadoop.io.NullWritable>

Throws:

IOException

cleanup

public void cleanup(org.apache.hadoop.mapreduce.Mapper.Context context)

Overrides:

cleanup in class org.apache.hadoop.mapreduce.Mapper<org.apache.hadoop.io.NullWritable,FaunusVertex,org.apache.hadoop.io.NullWritable,org.apache.hadoop.io.NullWritable>

map

public void map(org.apache.hadoop.io.NullWritable key,
                FaunusVertex faunusVertex,
                org.apache.hadoop.mapreduce.Mapper.Context context)
         throws IOException

Overrides:

map in class org.apache.hadoop.mapreduce.Mapper<org.apache.hadoop.io.NullWritable,FaunusVertex,org.apache.hadoop.io.NullWritable,org.apache.hadoop.io.NullWritable>

Throws:

IOException