@InterfaceAudience.Public @InterfaceStability.Stable public class ValueAggregatorMapper<K1 extends org.apache.hadoop.io.WritableComparable,V1 extends org.apache.hadoop.io.Writable> extends ValueAggregatorJobBase<K1,V1>
aggregatorDescriptorList
Constructor and Description |
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ValueAggregatorMapper() |
Modifier and Type | Method and Description |
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void |
map(K1 key,
V1 value,
OutputCollector<org.apache.hadoop.io.Text,org.apache.hadoop.io.Text> output,
Reporter reporter)
the map function.
|
void |
reduce(org.apache.hadoop.io.Text arg0,
Iterator<org.apache.hadoop.io.Text> arg1,
OutputCollector<org.apache.hadoop.io.Text,org.apache.hadoop.io.Text> arg2,
Reporter arg3)
Do nothing.
|
close, configure, logSpec
public void map(K1 key, V1 value, OutputCollector<org.apache.hadoop.io.Text,org.apache.hadoop.io.Text> output, Reporter reporter) throws IOException
key
- the input key.value
- the input value.output
- collects mapped keys and values.reporter
- facility to report progress.IOException
public void reduce(org.apache.hadoop.io.Text arg0, Iterator<org.apache.hadoop.io.Text> arg1, OutputCollector<org.apache.hadoop.io.Text,org.apache.hadoop.io.Text> arg2, Reporter arg3) throws IOException
arg0
- the key.arg1
- the list of values to reduce.arg2
- to collect keys and combined values.arg3
- facility to report progress.IOException
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