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java.lang.Objectorg.apache.hadoop.mapred.lib.aggregate.UniqValueCount
public class UniqValueCount
This class implements a value aggregator that dedupes a sequence of objects.
| Constructor Summary | |
|---|---|
UniqValueCount()
the default constructor |
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UniqValueCount(long maxNum)
constructor |
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| Method Summary | |
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void |
addNextValue(Object val)
add a value to the aggregator |
ArrayList |
getCombinerOutput()
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String |
getReport()
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Set |
getUniqueItems()
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void |
reset()
reset the aggregator |
long |
setMaxItems(long n)
Set the limit on the number of unique values |
| Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
| Constructor Detail |
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public UniqValueCount()
public UniqValueCount(long maxNum)
maxNum - the limit in the number of unique values to keep.| Method Detail |
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public long setMaxItems(long n)
n - the desired limit on the number of unique values
public void addNextValue(Object val)
addNextValue in interface ValueAggregatorval - an object.public String getReport()
getReport in interface ValueAggregatorpublic Set getUniqueItems()
public void reset()
reset in interface ValueAggregatorpublic ArrayList getCombinerOutput()
getCombinerOutput in interface ValueAggregator
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