void map(WritableComparable, Writable, OutputCollector, Reporter)
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Change in signature from (K1, extends, WritableComparable, V1, extends, Writable, Text, Text>, Reporter) to (WritableComparable, Writable, OutputCollector, Reporter).
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Do nothing. |
void reduce(Text, Iterator, OutputCollector, Reporter)
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Change in signature from (Text, Text>, Text, Text>, Reporter) to (Text, Iterator, OutputCollector, Reporter).
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@param key the key is expected to be a Text object whose prefix indicates the type of aggregation to aggregate the values. |