@InterfaceAudience.Public @InterfaceStability.Stable public class ValueAggregatorCombiner<K1 extends org.apache.hadoop.io.WritableComparable<?>,V1 extends org.apache.hadoop.io.Writable> extends Reducer<org.apache.hadoop.io.Text,org.apache.hadoop.io.Text,org.apache.hadoop.io.Text,org.apache.hadoop.io.Text>
Reducer.Context
Constructor and Description |
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ValueAggregatorCombiner() |
Modifier and Type | Method and Description |
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void |
reduce(org.apache.hadoop.io.Text key,
Iterable<org.apache.hadoop.io.Text> values,
Reducer.Context context)
Combines values for a given key.
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public void reduce(org.apache.hadoop.io.Text key, Iterable<org.apache.hadoop.io.Text> values, Reducer.Context context) throws IOException, InterruptedException
reduce
in class Reducer<org.apache.hadoop.io.Text,org.apache.hadoop.io.Text,org.apache.hadoop.io.Text,org.apache.hadoop.io.Text>
key
- the key is expected to be a Text object, whose prefix indicates
the type of aggregation to aggregate the values.values
- the values to combinecontext
- to collect combined valuesIOException
InterruptedException
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