Package org.apache.druid.indexer

Class DetermineHashedPartitionsJob.DetermineCardinalityReducer

java.lang.Object

org.apache.hadoop.mapreduce.Reducer<org.apache.hadoop.io.LongWritable,org.apache.hadoop.io.BytesWritable,org.apache.hadoop.io.NullWritable,org.apache.hadoop.io.NullWritable>

org.apache.druid.indexer.DetermineHashedPartitionsJob.DetermineCardinalityReducer

Enclosing class:

DetermineHashedPartitionsJob

public static class DetermineHashedPartitionsJob.DetermineCardinalityReducer
extends org.apache.hadoop.mapreduce.Reducer<org.apache.hadoop.io.LongWritable,org.apache.hadoop.io.BytesWritable,org.apache.hadoop.io.NullWritable,org.apache.hadoop.io.NullWritable>

Nested Class Summary

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

org.apache.hadoop.mapreduce.Reducer.Context

Field Summary

Fields

Modifier and Type	Field	Description
protected HadoopDruidIndexerConfig	config

Constructor Summary

Constructors

Constructor	Description
DetermineCardinalityReducer()

Method Summary

Modifier and Type	Method	Description
protected void	reduce(org.apache.hadoop.io.LongWritable key, Iterable<org.apache.hadoop.io.BytesWritable> values, org.apache.hadoop.mapreduce.Reducer.Context context)
void	run(org.apache.hadoop.mapreduce.Reducer.Context context)
protected void	setup(org.apache.hadoop.mapreduce.Reducer.Context context)

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

cleanup

Methods inherited from class java.lang.Object

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

Field Detail

config

@Nullable
protected HadoopDruidIndexerConfig config

Constructor Detail

DetermineCardinalityReducer

public DetermineCardinalityReducer()

Method Detail

setup

protected void setup(org.apache.hadoop.mapreduce.Reducer.Context context)

Overrides:

setup in class org.apache.hadoop.mapreduce.Reducer<org.apache.hadoop.io.LongWritable,org.apache.hadoop.io.BytesWritable,org.apache.hadoop.io.NullWritable,org.apache.hadoop.io.NullWritable>

reduce

protected void reduce(org.apache.hadoop.io.LongWritable key,
                      Iterable<org.apache.hadoop.io.BytesWritable> values,
                      org.apache.hadoop.mapreduce.Reducer.Context context)
               throws IOException

Overrides:

reduce in class org.apache.hadoop.mapreduce.Reducer<org.apache.hadoop.io.LongWritable,org.apache.hadoop.io.BytesWritable,org.apache.hadoop.io.NullWritable,org.apache.hadoop.io.NullWritable>

Throws:

IOException

run

public void run(org.apache.hadoop.mapreduce.Reducer.Context context)
         throws IOException,
                InterruptedException

Overrides:

run in class org.apache.hadoop.mapreduce.Reducer<org.apache.hadoop.io.LongWritable,org.apache.hadoop.io.BytesWritable,org.apache.hadoop.io.NullWritable,org.apache.hadoop.io.NullWritable>

Throws:

IOException

InterruptedException