Package | Description |
---|---|
org.apache.hadoop.mapred.lib.aggregate | |
org.apache.hadoop.mapreduce.lib.aggregate |
Modifier and Type | Interface and Description |
---|---|
interface |
ValueAggregator<E>
This interface defines the minimal protocol for value aggregators.
|
Modifier and Type | Class and Description |
---|---|
class |
DoubleValueSum
This class implements a value aggregator that sums up a sequence of double
values.
|
class |
LongValueMax
This class implements a value aggregator that maintain the maximum of
a sequence of long values.
|
class |
LongValueMin
This class implements a value aggregator that maintain the minimum of
a sequence of long values.
|
class |
LongValueSum
This class implements a value aggregator that sums up
a sequence of long values.
|
class |
StringValueMax
This class implements a value aggregator that maintain the biggest of
a sequence of strings.
|
class |
StringValueMin
This class implements a value aggregator that maintain the smallest of
a sequence of strings.
|
class |
UniqValueCount
This class implements a value aggregator that dedupes a sequence of objects.
|
class |
ValueHistogram
This class implements a value aggregator that computes the
histogram of a sequence of strings.
|
Modifier and Type | Method and Description |
---|---|
static ValueAggregator |
ValueAggregatorBaseDescriptor.generateValueAggregator(String type,
long uniqCount) |
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