org.apache.kylin.storage.hbase.steps

Class RangeKeyDistributionReducer

java.lang.Object

org.apache.hadoop.mapreduce.Reducer<KEYIN,VALUEIN,KEYOUT,VALUEOUT>

org.apache.kylin.engine.mr.KylinReducer<org.apache.hadoop.io.Text,org.apache.hadoop.io.LongWritable,org.apache.hadoop.io.Text,org.apache.hadoop.io.LongWritable>

org.apache.kylin.storage.hbase.steps.RangeKeyDistributionReducer

public class RangeKeyDistributionReducer
extends KylinReducer<org.apache.hadoop.io.Text,org.apache.hadoop.io.LongWritable,org.apache.hadoop.io.Text,org.apache.hadoop.io.LongWritable>

Author:

ysong1

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 and Description
static long	ONE_GIGA_BYTES

Fields inherited from class org.apache.kylin.engine.mr.KylinReducer

reduceCounter

Constructor Summary

Constructors

Constructor and Description
RangeKeyDistributionReducer()

Method Summary

Methods

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

Methods inherited from class org.apache.kylin.engine.mr.KylinReducer

bindCurrentConfiguration, cleanup, reduce

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

run

Methods inherited from class java.lang.Object

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

Field Detail

ONE_GIGA_BYTES

public static final long ONE_GIGA_BYTES

See Also:

Constant Field Values

Constructor Detail

RangeKeyDistributionReducer

public RangeKeyDistributionReducer()

Method Detail

setup

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

Overrides:

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

Throws:

IOException

doReduce

public void doReduce(org.apache.hadoop.io.Text key,
            Iterable<org.apache.hadoop.io.LongWritable> values,
            org.apache.hadoop.mapreduce.Reducer.Context context)
              throws IOException,
                     InterruptedException

Overrides:

doReduce in class KylinReducer<org.apache.hadoop.io.Text,org.apache.hadoop.io.LongWritable,org.apache.hadoop.io.Text,org.apache.hadoop.io.LongWritable>

Throws:

IOException

InterruptedException

doCleanup

protected void doCleanup(org.apache.hadoop.mapreduce.Reducer.Context context)
                  throws IOException,
                         InterruptedException

Overrides:

doCleanup in class KylinReducer<org.apache.hadoop.io.Text,org.apache.hadoop.io.LongWritable,org.apache.hadoop.io.Text,org.apache.hadoop.io.LongWritable>

Throws:

IOException

InterruptedException